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    <rr:RiskReturnHeading
      contextRef="From2024-04-302024-04-30_custom_S000003880Member"
      id="Fact000013">Fund summary</rr:RiskReturnHeading>
    <rr:ObjectiveHeading
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      id="Fact000014">Goal</rr:ObjectiveHeading>
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      id="Fact000015">&lt;p id="xdx_A80_err--ObjectivePrimaryTextBlock_zKMyUIEP9qvl" style="font: 10pt/1.5 Arial, Helvetica, Sans-Serif; margin: 0px 42px 9px; color: #000000; font-weight: 300; text-align: left"&gt;
Putnam VT Core Equity Fund seeks capital appreciation.
&lt;/p&gt;

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    <rr:ExpenseHeading
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      id="Fact000016">Fees and expenses</rr:ExpenseHeading>
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The following table describes the fees and expenses you may pay if you buy, hold and sell shares of the fund. You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in the tables and examples below. The fees and expenses information does not reflect insurance-related charges or expenses borne by contract holders indirectly investing in the fund. If it did, expenses would be higher.
&lt;/p&gt;

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    <rr:OperatingExpensesCaption
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      id="Fact000018">
Annual fund operating expenses 



(expenses you pay each year as a percentage of the value of your investment)
</rr:OperatingExpensesCaption>
    <rr:ManagementFeesOverAssets
      contextRef="From2024-04-302024-04-30_custom_S000003880Member_custom_C000010855Member"
      decimals="INF"
      id="Fact000020"
      unitRef="Ratio">0.0055</rr:ManagementFeesOverAssets>
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      contextRef="From2024-04-302024-04-30_custom_S000003880Member_custom_C000010855Member"
      decimals="INF"
      id="Fact000021"
      unitRef="Ratio">0</rr:DistributionAndService12b1FeesOverAssets>
    <rr:OtherExpensesOverAssets
      contextRef="From2024-04-302024-04-30_custom_S000003880Member_custom_C000010855Member"
      decimals="INF"
      id="Fact000022"
      unitRef="Ratio">0.0015</rr:OtherExpensesOverAssets>
    <rr:ExpensesOverAssets
      contextRef="From2024-04-302024-04-30_custom_S000003880Member_custom_C000010855Member"
      decimals="INF"
      id="Fact000023"
      unitRef="Ratio">0.0070</rr:ExpensesOverAssets>
    <rr:ManagementFeesOverAssets
      contextRef="From2024-04-302024-04-30_custom_S000003880Member_custom_C000010856Member"
      decimals="INF"
      id="Fact000024"
      unitRef="Ratio">0.0055</rr:ManagementFeesOverAssets>
    <rr:DistributionAndService12b1FeesOverAssets
      contextRef="From2024-04-302024-04-30_custom_S000003880Member_custom_C000010856Member"
      decimals="INF"
      id="Fact000025"
      unitRef="Ratio">0.0025</rr:DistributionAndService12b1FeesOverAssets>
    <rr:OtherExpensesOverAssets
      contextRef="From2024-04-302024-04-30_custom_S000003880Member_custom_C000010856Member"
      decimals="INF"
      id="Fact000026"
      unitRef="Ratio">0.0015</rr:OtherExpensesOverAssets>
    <rr:ExpensesOverAssets
      contextRef="From2024-04-302024-04-30_custom_S000003880Member_custom_C000010856Member"
      decimals="INF"
      id="Fact000027"
      unitRef="Ratio">0.0095</rr:ExpensesOverAssets>
    <rr:ExpenseExampleHeading
      contextRef="From2024-04-302024-04-30_custom_S000003880Member"
      id="Fact000028">Example</rr:ExpenseExampleHeading>
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      id="Fact000029">&lt;p id="xdx_A8A_err--ExpenseExampleNarrativeTextBlock_zXYi4iK6Vzn2" style="font: 10pt/1.5 Arial, Helvetica, Sans-Serif; margin: 0px 42px 9px; color: #000000; font-weight: 300; text-align: left"&gt;
The following hypothetical example is intended to help you compare the cost of investing in the fund with the cost of investing in other funds. The example does not reflect insurance-related charges or expenses. If it did, expenses would be higher. It assumes that you invest $10,000 in the fund for the time periods indicated and then redeem or hold all your shares at the end of those periods. It assumes a 5% return on your investment each year and that the fund&#x2019;s operating expenses remain the same. Your actual costs may be higher or lower.
&lt;/p&gt;

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    <rr:ExpenseExampleYear01
      contextRef="From2024-04-302024-04-30_custom_S000003880Member_custom_C000010855Member"
      decimals="0"
      id="Fact000031"
      unitRef="USD">72</rr:ExpenseExampleYear01>
    <rr:ExpenseExampleYear03
      contextRef="From2024-04-302024-04-30_custom_S000003880Member_custom_C000010855Member"
      decimals="0"
      id="Fact000032"
      unitRef="USD">224</rr:ExpenseExampleYear03>
    <rr:ExpenseExampleYear05
      contextRef="From2024-04-302024-04-30_custom_S000003880Member_custom_C000010855Member"
      decimals="0"
      id="Fact000033"
      unitRef="USD">390</rr:ExpenseExampleYear05>
    <rr:ExpenseExampleYear10
      contextRef="From2024-04-302024-04-30_custom_S000003880Member_custom_C000010855Member"
      decimals="0"
      id="Fact000034"
      unitRef="USD">871</rr:ExpenseExampleYear10>
    <rr:ExpenseExampleYear01
      contextRef="From2024-04-302024-04-30_custom_S000003880Member_custom_C000010856Member"
      decimals="0"
      id="Fact000035"
      unitRef="USD">97</rr:ExpenseExampleYear01>
    <rr:ExpenseExampleYear03
      contextRef="From2024-04-302024-04-30_custom_S000003880Member_custom_C000010856Member"
      decimals="0"
      id="Fact000036"
      unitRef="USD">303</rr:ExpenseExampleYear03>
    <rr:ExpenseExampleYear05
      contextRef="From2024-04-302024-04-30_custom_S000003880Member_custom_C000010856Member"
      decimals="0"
      id="Fact000037"
      unitRef="USD">525</rr:ExpenseExampleYear05>
    <rr:ExpenseExampleYear10
      contextRef="From2024-04-302024-04-30_custom_S000003880Member_custom_C000010856Member"
      decimals="0"
      id="Fact000038"
      unitRef="USD">1166</rr:ExpenseExampleYear10>
    <rr:PortfolioTurnoverHeading
      contextRef="From2024-04-302024-04-30_custom_S000003880Member"
      id="Fact000039">Portfolio turnover</rr:PortfolioTurnoverHeading>
    <rr:PortfolioTurnoverTextBlock
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      id="Fact000040">&lt;p id="xdx_A8F_err--PortfolioTurnoverTextBlock_ziV5BFRXfFAk" style="font: 10pt/1.5 Arial, Helvetica, Sans-Serif; margin: 0px 42px 9px; color: #000000; font-weight: 300; text-align: left"&gt;
The fund pays transaction-related costs, such as commissions, when it buys and sells securities (or &#x201c;turns over&#x201d; its portfolio). A higher turnover rate may indicate higher transaction costs. These costs, which are not reflected in annual fund operating expenses or the above example, affect fund performance. The fund&#x2019;s turnover rate in the most recent fiscal year was &lt;span id="xdx_907_err--PortfolioTurnoverRate_dU_c20240430__20240430__dei--LegalEntityAxis__custom--S000003880Member_zCQZzMLcI9Sj"&gt;17%&lt;/span&gt;.
&lt;/p&gt;

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    <rr:PortfolioTurnoverRate
      contextRef="From2024-04-302024-04-30_custom_S000003880Member"
      decimals="INF"
      id="Fact000041"
      unitRef="Ratio">0.17</rr:PortfolioTurnoverRate>
    <rr:StrategyHeading
      contextRef="From2024-04-302024-04-30_custom_S000003880Member"
      id="Fact000042">Investments, risks, and performance</rr:StrategyHeading>
    <rr:StrategyNarrativeTextBlock
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      id="Fact000043">&lt;p id="xdx_A8B_err--StrategyNarrativeTextBlock_z6Yxokz0dEx6" style="font: 600 10pt/1.5 Arial, Helvetica, Sans-Serif; margin: 15px 42px 0px; color: #000000"&gt;
&lt;b&gt;Investments&lt;/b&gt;
&lt;/p&gt;

&lt;p style="font: 10pt/1.5 Arial, Helvetica, Sans-Serif; margin: 0px 42px 9px; color: #000000; font-weight: 300; text-align: left"&gt;
We invest mainly in common stocks (growth or value stocks or both) of U.S. companies of any size that we believe have favorable investment potential. For example, we may purchase stocks of companies with stock prices that reflect a value lower than that which we place on the company. We may also consider other factors we believe will cause the stock price to rise. We may consider, among other factors, a company&#x2019;s valuation, financial strength, growth potential, competitive position in its industry, projected future earnings, cash flows and dividends when deciding whether to buy or sell investments. Under normal circumstances, we invest at least 80% of the fund&#x2019;s net&#160;assets (plus the amount of any borrowings for investment purposes) in equity investments, including common stocks, preferred stocks, convertible securities, warrants, American Depositary Receipts (ADRs) and Global Depositary Receipts (GDRs). This policy may be changed only after 60 days&#x2019; notice to shareholders. 
&lt;/p&gt;

</rr:StrategyNarrativeTextBlock>
    <rr:RiskHeading
      contextRef="From2024-04-302024-04-30_custom_S000003880Member"
      id="Fact000044">Risks</rr:RiskHeading>
    <rr:RiskTextBlock
      contextRef="From2024-04-302024-04-30_custom_S000003880Member"
      id="Fact000045">&lt;p id="xdx_A88_err--RiskTextBlock_zwtwjNJCEaa2" style="font: 10pt/1.5 Arial, Helvetica, Sans-Serif; margin: 0px 42px 9px; color: #000000; font-weight: 300; text-align: left"&gt;
&lt;span id="xdx_909_err--RiskTextBlock_dU_c20240430__20240430__dei--LegalEntityAxis__custom--S000003880Member__rr--RiskAxis__rr--RiskLoseMoneyMember_zD2GRTNUCXRi"&gt;It is important to understand that you can lose money by investing in the fund.&lt;/span&gt;
&lt;/p&gt;

&lt;p style="font: 10pt/1.5 Arial, Helvetica, Sans-Serif; margin: 0px 42px 9px; color: #000000; font-weight: 300; text-align: left"&gt;
The value of investments in the fund&#x2019;s portfolio may fall or fail to rise over extended periods of time for a variety of reasons, including general economic, political or financial market conditions, investor sentiment and market perceptions, government actions, geopolitical events or changes, outbreaks of infectious illnesses or other widespread public health issues, and factors related to a specific issuer, geography, industry or sector. These and other factors may lead to increased volatility and reduced liquidity in the fund&#x2019;s portfolio holdings, may negatively impact the fund&#x2019;s performance, and may exacerbate other risks to which the fund is subject. Growth stocks may be more susceptible to earnings disappointments, and value stocks may fail to rebound. These risks are generally greater for small and midsize companies.
&lt;/p&gt;

&lt;p style="font: 10pt/1.5 Arial, Helvetica, Sans-Serif; margin: 0px 42px 9px; color: #000000; font-weight: 300; text-align: left"&gt;
There is no guarantee that the investment techniques, analyses, or judgments that we apply in making investment decisions for the fund will produce the intended outcome or that the investments we select for the fund will perform as well as other securities that were not selected for the fund. We, or the fund&#x2019;s other service providers, may experience disruptions or operating errors that could negatively impact the fund.
&lt;/p&gt;

&lt;p style="font: 10pt/1.5 Arial, Helvetica, Sans-Serif; margin: 0px 42px 9px; color: #000000; font-weight: 300; text-align: left"&gt;&lt;span style="-sec-ix-redline: true"&gt;The
fund may be an investment option for mutual funds that are managed by Franklin Resources, Inc. (Franklin Templeton) and its affiliates
as &#x201c;funds of funds&#x201d; and other investors with substantial investments in the fund. Such shareholders may at times be considered
to control the fund. Dispositions of a large number of shares by these shareholders may adversely affect the fund&#x2019;s liquidity and
net&#160;assets. These redemptions may also force the fund to sell securities, which may increase the fund&#x2019;s brokerage costs.&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt/1.5 Arial, Helvetica, Sans-Serif; margin: 0px 42px 9px; color: #000000; font-weight: 300; text-align: left"&gt;
The fund may not achieve its goal, and it is not intended to be a complete investment program.&lt;span id="xdx_900_err--RiskTextBlock_dU_c20240430__20240430__dei--LegalEntityAxis__custom--S000003880Member__rr--RiskAxis__rr--RiskNotInsuredDepositoryInstitutionMember_z6iOUzxoZXj1"&gt; An investment in the fund is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency.
&lt;/span&gt;&lt;/p&gt;

</rr:RiskTextBlock>
    <rr:RiskTextBlock
      contextRef="From2024-04-302024-04-30_custom_S000003880Member_rr_RiskLoseMoneyMember"
      id="Fact000046">It is important to understand that you can lose money by investing in the fund.</rr:RiskTextBlock>
    <rr:RiskTextBlock
      contextRef="From2024-04-302024-04-30_custom_S000003880Member_rr_RiskNotInsuredDepositoryInstitutionMember"
      id="Fact000047"> An investment in the fund is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency.
</rr:RiskTextBlock>
    <rr:BarChartAndPerformanceTableHeading
      contextRef="From2024-04-302024-04-30_custom_S000003880Member"
      id="Fact000048">Performance</rr:BarChartAndPerformanceTableHeading>
    <rr:PerformanceNarrativeTextBlock
      contextRef="From2024-04-302024-04-30_custom_S000003880Member"
      id="Fact000049">&lt;p id="xdx_A85_err--PerformanceNarrativeTextBlock_zEhbtgv0tQxg" style="font: 10pt/1.5 Arial, Helvetica, Sans-Serif; margin: 0px 42px 9px; color: #000000; font-weight: 300; text-align: left"&gt;
&lt;span id="xdx_90E_err--PerformanceInformationIllustratesVariabilityOfReturns_dU_c20240430__20240430__dei--LegalEntityAxis__custom--S000003880Member_zhF2ZraKSkAh"&gt;The performance information below gives some indication of the risks associated with an investment in the fund by showing the fund&#x2019;s performance year to year and over time.&lt;/span&gt; Before June&#160;30, 2018, the fund was managed with a materially different investment strategy and may have achieved materially different performance results under its current investment strategy from 
&lt;/p&gt;



&lt;p&gt;
&lt;br/&gt;
&lt;br/&gt;
&lt;/p&gt;

&lt;div style="border-top: Black 1pt solid; margin: 18pt auto; font-size: 1pt"&gt;&#160;&lt;/div&gt;

&lt;p&gt;&lt;br/&gt;
&lt;br/&gt;
&lt;/p&gt;

&lt;p style="font: 10pt/1.5 Arial, Helvetica, Sans-Serif; margin: 0px 42px 9px; color: #000000; font-weight: 300; text-align: left"&gt;
that shown for periods before this date. The performance information does not reflect insurance-related charges or expenses. If it did, performance would be lower. &lt;span id="xdx_90F_err--PerformancePastDoesNotIndicateFuture_dU_c20240430__20240430__dei--LegalEntityAxis__custom--S000003880Member_zolxUCSiqMe5"&gt;Please remember that past performance is not necessarily an indication of future results. &lt;/span&gt;
&lt;/p&gt;

</rr:PerformanceNarrativeTextBlock>
    <rr:PerformanceInformationIllustratesVariabilityOfReturns
      contextRef="From2024-04-302024-04-30_custom_S000003880Member"
      id="Fact000050">The performance information below gives some indication of the risks associated with an investment in the fund by showing the fund&#x2019;s performance year to year and over time.</rr:PerformanceInformationIllustratesVariabilityOfReturns>
    <rr:PerformancePastDoesNotIndicateFuture
      contextRef="From2024-04-302024-04-30_custom_S000003880Member"
      id="Fact000052">Please remember that past performance is not necessarily an indication of future results.</rr:PerformancePastDoesNotIndicateFuture>
    <rr:BarChartHeading
      contextRef="From2024-04-302024-04-30_custom_S000003880Member"
      id="Fact000053">Annual total returns for class IA shares</rr:BarChartHeading>
    <rr:AnnualReturn2014
      contextRef="From2024-04-302024-04-30_custom_S000003880Member_custom_C000010855Member"
      decimals="INF"
      id="Fact000056"
      unitRef="Ratio">0.1425</rr:AnnualReturn2014>
    <rr:AnnualReturn2015
      contextRef="From2024-04-302024-04-30_custom_S000003880Member_custom_C000010855Member"
      decimals="INF"
      id="Fact000058"
      unitRef="Ratio">-0.0196</rr:AnnualReturn2015>
    <rr:AnnualReturn2016
      contextRef="From2024-04-302024-04-30_custom_S000003880Member_custom_C000010855Member"
      decimals="INF"
      id="Fact000060"
      unitRef="Ratio">0.1234</rr:AnnualReturn2016>
    <rr:AnnualReturn2017
      contextRef="From2024-04-302024-04-30_custom_S000003880Member_custom_C000010855Member"
      decimals="INF"
      id="Fact000062"
      unitRef="Ratio">0.2314</rr:AnnualReturn2017>
    <rr:AnnualReturn2018
      contextRef="From2024-04-302024-04-30_custom_S000003880Member_custom_C000010855Member"
      decimals="INF"
      id="Fact000064"
      unitRef="Ratio">-0.0744</rr:AnnualReturn2018>
    <rr:AnnualReturn2019
      contextRef="From2024-04-302024-04-30_custom_S000003880Member_custom_C000010855Member"
      decimals="INF"
      id="Fact000066"
      unitRef="Ratio">0.3200</rr:AnnualReturn2019>
    <rr:AnnualReturn2020
      contextRef="From2024-04-302024-04-30_custom_S000003880Member_custom_C000010855Member"
      decimals="INF"
      id="Fact000068"
      unitRef="Ratio">0.1764</rr:AnnualReturn2020>
    <rr:AnnualReturn2021
      contextRef="From2024-04-302024-04-30_custom_S000003880Member_custom_C000010855Member"
      decimals="INF"
      id="Fact000070"
      unitRef="Ratio">0.3132</rr:AnnualReturn2021>
    <rr:AnnualReturn2022
      contextRef="From2024-04-302024-04-30_custom_S000003880Member_custom_C000010855Member"
      decimals="INF"
      id="Fact000072"
      unitRef="Ratio">-0.1554</rr:AnnualReturn2022>
    <rr:AnnualReturn2023
      contextRef="From2024-04-302024-04-30_custom_S000003880Member_custom_C000010855Member"
      decimals="INF"
      id="Fact000074"
      unitRef="Ratio">0.2836</rr:AnnualReturn2023>
    <rr:YearToDateReturnLabel
      contextRef="From2024-04-302024-04-30_custom_S000003880Member"
      id="Fact000075">Year-to-date performance
through</rr:YearToDateReturnLabel>
    <rr:BarChartYearToDateReturnDate
      contextRef="From2024-04-302024-04-30_custom_S000003880Member"
      id="Fact000076">2024-03-31</rr:BarChartYearToDateReturnDate>
    <rr:BarChartYearToDateReturn
      contextRef="From2024-04-302024-04-30_custom_S000003880Member"
      decimals="INF"
      id="Fact000077"
      unitRef="Ratio">0.1190</rr:BarChartYearToDateReturn>
    <rr:HighestQuarterlyReturnLabel
      contextRef="From2024-04-302024-04-30_custom_S000003880Member"
      id="Fact000078">Best calendar quarter</rr:HighestQuarterlyReturnLabel>
    <rr:BarChartHighestQuarterlyReturnDate
      contextRef="From2024-04-302024-04-30_custom_S000003880Member"
      id="Fact000079">2020-06-30</rr:BarChartHighestQuarterlyReturnDate>
    <rr:BarChartHighestQuarterlyReturn
      contextRef="From2024-04-302024-04-30_custom_S000003880Member"
      decimals="INF"
      id="Fact000080"
      unitRef="Ratio">0.2134</rr:BarChartHighestQuarterlyReturn>
    <rr:LowestQuarterlyReturnLabel
      contextRef="From2024-04-302024-04-30_custom_S000003880Member"
      id="Fact000081">Worst calendar quarter</rr:LowestQuarterlyReturnLabel>
    <rr:BarChartLowestQuarterlyReturnDate
      contextRef="From2024-04-302024-04-30_custom_S000003880Member"
      id="Fact000082">2020-03-31</rr:BarChartLowestQuarterlyReturnDate>
    <rr:BarChartLowestQuarterlyReturn
      contextRef="From2024-04-302024-04-30_custom_S000003880Member"
      decimals="INF"
      id="Fact000083"
      unitRef="Ratio">-0.2284</rr:BarChartLowestQuarterlyReturn>
    <rr:PerformanceTableHeading
      contextRef="From2024-04-302024-04-30_custom_S000003880Member"
      id="Fact000084">Average
annual total returns 
(for periods ended 12/31/23)</rr:PerformanceTableHeading>
    <rr:AverageAnnualReturnYear01
      contextRef="From2024-04-302024-04-30_custom_S000003880Member_custom_C000010855Member"
      decimals="INF"
      id="Fact000086"
      unitRef="Ratio">0.2836</rr:AverageAnnualReturnYear01>
    <rr:AverageAnnualReturnYear05
      contextRef="From2024-04-302024-04-30_custom_S000003880Member_custom_C000010855Member"
      decimals="INF"
      id="Fact000087"
      unitRef="Ratio">0.1719</rr:AverageAnnualReturnYear05>
    <rr:AverageAnnualReturnYear10
      contextRef="From2024-04-302024-04-30_custom_S000003880Member_custom_C000010855Member"
      decimals="INF"
      id="Fact000088"
      unitRef="Ratio">0.1223</rr:AverageAnnualReturnYear10>
    <rr:AverageAnnualReturnYear01
      contextRef="From2024-04-302024-04-30_custom_S000003880Member_custom_C000010856Member"
      decimals="INF"
      id="Fact000089"
      unitRef="Ratio">0.2808</rr:AverageAnnualReturnYear01>
    <rr:AverageAnnualReturnYear05
      contextRef="From2024-04-302024-04-30_custom_S000003880Member_custom_C000010856Member"
      decimals="INF"
      id="Fact000090"
      unitRef="Ratio">0.1690</rr:AverageAnnualReturnYear05>
    <rr:AverageAnnualReturnYear10
      contextRef="From2024-04-302024-04-30_custom_S000003880Member_custom_C000010856Member"
      decimals="INF"
      id="Fact000091"
      unitRef="Ratio">0.1195</rr:AverageAnnualReturnYear10>
    <rr:AverageAnnualReturnYear01
      contextRef="From2024-04-302024-04-30_custom_S000003880Member_custom_Russell3000IndexMember"
      decimals="INF"
      id="Fact000092"
      unitRef="Ratio">0.2596</rr:AverageAnnualReturnYear01>
    <rr:AverageAnnualReturnYear05
      contextRef="From2024-04-302024-04-30_custom_S000003880Member_custom_Russell3000IndexMember"
      decimals="INF"
      id="Fact000093"
      unitRef="Ratio">0.1516</rr:AverageAnnualReturnYear05>
    <rr:AverageAnnualReturnYear10
      contextRef="From2024-04-302024-04-30_custom_S000003880Member_custom_Russell3000IndexMember"
      decimals="INF"
      id="Fact000094"
      unitRef="Ratio">0.1148</rr:AverageAnnualReturnYear10>
    <rr:PerformanceTableClosingTextBlock
      contextRef="From2024-04-302024-04-30_custom_S000003880Member"
      id="Fact000095">&lt;div id="xdx_A82_err--PerformanceTableClosingTextBlock_zDSaJQRJWwSk"&gt;&lt;/div&gt;
&lt;table style="font: 300 9pt/1.5 Arial, Helvetica, Sans-Serif; margin-left: 10px; width: 90%"&gt;
&lt;tr style="vertical-align: top"&gt;
&lt;td style="width: 25px; text-align: right"&gt;


&lt;/td&gt;
&lt;td&gt;Frank Russell Company is the source and owner of the trademarks, service marks and copyrights related to the Russell Indexes. Russell&lt;sup&gt;&#xae;
&lt;/sup&gt;is a trademark of Frank Russell Company.&lt;/td&gt;

&lt;/tr&gt;
&lt;/table&gt;

</rr:PerformanceTableClosingTextBlock>
    <rr:RiskReturnHeading
      contextRef="From2024-04-302024-04-30_custom_S000003893Member"
      id="Fact000097">Fund summary</rr:RiskReturnHeading>
    <rr:ObjectiveHeading
      contextRef="From2024-04-302024-04-30_custom_S000003893Member"
      id="Fact000098">Goal</rr:ObjectiveHeading>
    <rr:ObjectivePrimaryTextBlock
      contextRef="From2024-04-302024-04-30_custom_S000003893Member"
      id="Fact000099">&lt;p id="xdx_A87_err--ObjectivePrimaryTextBlock_zqWmKEQoIXVb" style="font: 10pt/1.5 Arial, Helvetica, Sans-Serif; margin: 0px 42px 9px; color: #000000; font-weight: 300; text-align: left"&gt;
Putnam VT Diversified Income Fund seeks as high a level of current income as Putnam Investment Management, LLC believes is consistent with preservation of capital.
&lt;/p&gt;

</rr:ObjectivePrimaryTextBlock>
    <rr:ExpenseHeading
      contextRef="From2024-04-302024-04-30_custom_S000003893Member"
      id="Fact000100">Fees and expenses</rr:ExpenseHeading>
    <rr:ExpenseNarrativeTextBlock
      contextRef="From2024-04-302024-04-30_custom_S000003893Member"
      id="Fact000101">&lt;p id="xdx_A8E_err--ExpenseNarrativeTextBlock_zZoSK6UjAuoj" style="font: 10pt/1.5 Arial, Helvetica, Sans-Serif; margin: 0px 42px 9px; color: #000000; font-weight: 300; text-align: left"&gt;
The following table describes the fees and expenses you may pay if you buy, hold and sell shares of the fund. You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in the tables and examples below. The fees and expenses information does not reflect insurance-related charges or expenses borne by contract holders indirectly investing in the fund. If it did, expenses would be higher.
&lt;/p&gt;

</rr:ExpenseNarrativeTextBlock>
    <rr:OperatingExpensesCaption
      contextRef="From2024-04-302024-04-30_custom_S000003893Member"
      id="Fact000102">
Annual fund operating expenses 



(expenses you pay each year as a percentage of the value of your investment)
</rr:OperatingExpensesCaption>
    <rr:ManagementFeesOverAssets
      contextRef="From2024-04-302024-04-30_custom_S000003893Member_custom_C000010881Member"
      decimals="INF"
      id="Fact000104"
      unitRef="Ratio">0.0054</rr:ManagementFeesOverAssets>
    <rr:DistributionAndService12b1FeesOverAssets
      contextRef="From2024-04-302024-04-30_custom_S000003893Member_custom_C000010881Member"
      decimals="INF"
      id="Fact000105"
      unitRef="Ratio">0</rr:DistributionAndService12b1FeesOverAssets>
    <rr:OtherExpensesOverAssets
      contextRef="From2024-04-302024-04-30_custom_S000003893Member_custom_C000010881Member"
      decimals="INF"
      id="Fact000106"
      unitRef="Ratio">0.0035</rr:OtherExpensesOverAssets>
    <rr:AcquiredFundFeesAndExpensesOverAssets
      contextRef="From2024-04-302024-04-30_custom_S000003893Member_custom_C000010881Member"
      decimals="INF"
      id="Fact000107"
      unitRef="Ratio">0.0001</rr:AcquiredFundFeesAndExpensesOverAssets>
    <rr:ExpensesOverAssets
      contextRef="From2024-04-302024-04-30_custom_S000003893Member_custom_C000010881Member"
      decimals="INF"
      id="Fact000108"
      unitRef="Ratio">0.0090</rr:ExpensesOverAssets>
    <rr:FeeWaiverOrReimbursementOverAssets
      contextRef="From2024-04-302024-04-30_custom_S000003893Member_custom_C000010881Member"
      decimals="INF"
      id="Fact000109"
      unitRef="Ratio">-0.0008</rr:FeeWaiverOrReimbursementOverAssets>
    <rr:NetExpensesOverAssets
      contextRef="From2024-04-302024-04-30_custom_S000003893Member_custom_C000010881Member"
      decimals="INF"
      id="Fact000110"
      unitRef="Ratio">0.0082</rr:NetExpensesOverAssets>
    <rr:ManagementFeesOverAssets
      contextRef="From2024-04-302024-04-30_custom_S000003893Member_custom_C000010882Member"
      decimals="INF"
      id="Fact000111"
      unitRef="Ratio">0.0054</rr:ManagementFeesOverAssets>
    <rr:DistributionAndService12b1FeesOverAssets
      contextRef="From2024-04-302024-04-30_custom_S000003893Member_custom_C000010882Member"
      decimals="INF"
      id="Fact000112"
      unitRef="Ratio">0.0025</rr:DistributionAndService12b1FeesOverAssets>
    <rr:OtherExpensesOverAssets
      contextRef="From2024-04-302024-04-30_custom_S000003893Member_custom_C000010882Member"
      decimals="INF"
      id="Fact000113"
      unitRef="Ratio">0.0035</rr:OtherExpensesOverAssets>
    <rr:AcquiredFundFeesAndExpensesOverAssets
      contextRef="From2024-04-302024-04-30_custom_S000003893Member_custom_C000010882Member"
      decimals="INF"
      id="Fact000114"
      unitRef="Ratio">0.0001</rr:AcquiredFundFeesAndExpensesOverAssets>
    <rr:ExpensesOverAssets
      contextRef="From2024-04-302024-04-30_custom_S000003893Member_custom_C000010882Member"
      decimals="INF"
      id="Fact000115"
      unitRef="Ratio">0.0115</rr:ExpensesOverAssets>
    <rr:FeeWaiverOrReimbursementOverAssets
      contextRef="From2024-04-302024-04-30_custom_S000003893Member_custom_C000010882Member"
      decimals="INF"
      id="Fact000116"
      unitRef="Ratio">-0.0008</rr:FeeWaiverOrReimbursementOverAssets>
    <rr:NetExpensesOverAssets
      contextRef="From2024-04-302024-04-30_custom_S000003893Member_custom_C000010882Member"
      decimals="INF"
      id="Fact000117"
      unitRef="Ratio">0.0107</rr:NetExpensesOverAssets>
    <rr:FeeWaiverOrReimbursementOverAssetsDateOfTermination
      contextRef="From2024-04-302024-04-30_custom_S000003893Member"
      id="Fact000119">4/30/25.</rr:FeeWaiverOrReimbursementOverAssetsDateOfTermination>
    <rr:ExpenseExampleHeading
      contextRef="From2024-04-302024-04-30_custom_S000003893Member"
      id="Fact000120">Example</rr:ExpenseExampleHeading>
    <rr:ExpenseExampleNarrativeTextBlock
      contextRef="From2024-04-302024-04-30_custom_S000003893Member"
      id="Fact000121">&lt;p id="xdx_A84_err--ExpenseExampleNarrativeTextBlock_zCZ6AtmuFELl" style="font: 10pt/1.5 Arial, Helvetica, Sans-Serif; margin: 0px 42px 9px; color: #000000; font-weight: 300; text-align: left"&gt;
The following hypothetical example is intended to help you compare the cost of investing in the fund with the cost of investing in other funds. The example does not reflect insurance-related charges or expenses. If it did, expenses would be higher. It assumes that you invest $10,000 in the fund for the time periods indicated and then redeem or hold all your shares at the end of those periods. It assumes a 5% return on your investment each year and that the fund&#x2019;s operating expenses remain the same. Your actual costs may be higher or lower.
&lt;/p&gt;

</rr:ExpenseExampleNarrativeTextBlock>
    <rr:ExpenseExampleYear01
      contextRef="From2024-04-302024-04-30_custom_S000003893Member_custom_C000010881Member"
      decimals="0"
      id="Fact000123"
      unitRef="USD">84</rr:ExpenseExampleYear01>
    <rr:ExpenseExampleYear03
      contextRef="From2024-04-302024-04-30_custom_S000003893Member_custom_C000010881Member"
      decimals="0"
      id="Fact000124"
      unitRef="USD">279</rr:ExpenseExampleYear03>
    <rr:ExpenseExampleYear05
      contextRef="From2024-04-302024-04-30_custom_S000003893Member_custom_C000010881Member"
      decimals="0"
      id="Fact000125"
      unitRef="USD">491</rr:ExpenseExampleYear05>
    <rr:ExpenseExampleYear10
      contextRef="From2024-04-302024-04-30_custom_S000003893Member_custom_C000010881Member"
      decimals="0"
      id="Fact000126"
      unitRef="USD">1101</rr:ExpenseExampleYear10>
    <rr:ExpenseExampleYear01
      contextRef="From2024-04-302024-04-30_custom_S000003893Member_custom_C000010882Member"
      decimals="0"
      id="Fact000127"
      unitRef="USD">109</rr:ExpenseExampleYear01>
    <rr:ExpenseExampleYear03
      contextRef="From2024-04-302024-04-30_custom_S000003893Member_custom_C000010882Member"
      decimals="0"
      id="Fact000128"
      unitRef="USD">358</rr:ExpenseExampleYear03>
    <rr:ExpenseExampleYear05
      contextRef="From2024-04-302024-04-30_custom_S000003893Member_custom_C000010882Member"
      decimals="0"
      id="Fact000129"
      unitRef="USD">626</rr:ExpenseExampleYear05>
    <rr:ExpenseExampleYear10
      contextRef="From2024-04-302024-04-30_custom_S000003893Member_custom_C000010882Member"
      decimals="0"
      id="Fact000130"
      unitRef="USD">1391</rr:ExpenseExampleYear10>
    <rr:PortfolioTurnoverHeading
      contextRef="From2024-04-302024-04-30_custom_S000003893Member"
      id="Fact000131">Portfolio turnover</rr:PortfolioTurnoverHeading>
    <rr:PortfolioTurnoverTextBlock
      contextRef="From2024-04-302024-04-30_custom_S000003893Member"
      id="Fact000132">&lt;p id="xdx_A89_err--PortfolioTurnoverTextBlock_zKunMDxfmE2d" style="font: 10pt/1.5 Arial, Helvetica, Sans-Serif; margin: 0px 42px 9px; color: #000000; font-weight: 300; text-align: left"&gt;
&lt;span style="-sec-ix-redline: true"&gt;The fund pays transaction-related costs, such as commissions, when it buys and sells securities (or &#x201c;turns over&#x201d; its portfolio). A higher turnover rate may indicate higher transaction costs. These costs, which are not reflected in annual fund operating expenses or the above example, affect fund performance. The fund&#x2019;s turnover rate in the most recent fiscal year was &lt;span id="xdx_90F_err--PortfolioTurnoverRate_dpU_c20240430__20240430__dei--LegalEntityAxis__custom--S000003893Member_zJH0JshJdqva"&gt;1395&lt;/span&gt;%.
&lt;/span&gt;&lt;/p&gt;

</rr:PortfolioTurnoverTextBlock>
    <rr:PortfolioTurnoverRate
      contextRef="From2024-04-302024-04-30_custom_S000003893Member"
      decimals="INF"
      id="Fact000133"
      unitRef="Ratio">13.95</rr:PortfolioTurnoverRate>
    <rr:StrategyHeading
      contextRef="From2024-04-302024-04-30_custom_S000003893Member"
      id="Fact000134">Investments, risks, and performance</rr:StrategyHeading>
    <rr:StrategyNarrativeTextBlock
      contextRef="From2024-04-302024-04-30_custom_S000003893Member"
      id="Fact000135">&lt;p id="xdx_A89_err--StrategyNarrativeTextBlock_zEWNYuuaZJf9" style="font: 600 10pt/1.5 Arial, Helvetica, Sans-Serif; margin: 15px 42px 0px; color: #000000"&gt;
&lt;b&gt;Investments&lt;/b&gt;
&lt;/p&gt;

&lt;p style="font: 10pt/1.5 Arial, Helvetica, Sans-Serif; margin: 0px 42px 9px; color: #000000; font-weight: 300; text-align: left"&gt;
We invest mainly in bonds that are securitized debt instruments (such as mortgage-backed investments) and related derivative instruments, and other obligations of companies and governments worldwide, including bank loans, that are either investment-grade or below-investment-grade in quality (sometimes referred to as &#x201c;junk bonds&#x201d;) and have intermediate- to long-term maturities (three years or longer). The fund currently has significant investment exposure to residential and commercial mortgage-backed securities.
&lt;/p&gt;

&lt;p style="font: 10pt/1.5 Arial, Helvetica, Sans-Serif; margin: 0px 42px 9px; color: #000000; font-weight: 300; text-align: left"&gt;
We may consider, among other factors, credit, interest rate and prepayment risks, as well as general market conditions, when deciding whether to buy or sell investments. We typically use to a significant extent derivatives, including credit default swaps, interest rate swaps, total return swaps, to-be-announced (TBA) commitments, futures, options and swaptions on mortgage-backed securities and indices, and certain foreign currency transactions and credit default, total return and interest rate swap contracts for both hedging and non-hedging purposes, including to obtain or adjust exposure to mortgage-backed investments.
&lt;/p&gt;

</rr:StrategyNarrativeTextBlock>
    <rr:RiskHeading
      contextRef="From2024-04-302024-04-30_custom_S000003893Member"
      id="Fact000136">Risks</rr:RiskHeading>
    <rr:RiskTextBlock
      contextRef="From2024-04-302024-04-30_custom_S000003893Member"
      id="Fact000137">&lt;p id="xdx_A8E_err--RiskTextBlock_zjUwBNr6g0M" style="font: 10pt/1.5 Arial, Helvetica, Sans-Serif; margin: 0px 42px 9px; color: #000000; font-weight: 300; text-align: left"&gt;
&lt;span id="xdx_90B_err--RiskTextBlock_dU_c20240430__20240430__dei--LegalEntityAxis__custom--S000003893Member__rr--RiskAxis__rr--RiskLoseMoneyMember_zUBAPQAk8R07"&gt;It is important to understand that you can lose money by investing in the fund.&lt;/span&gt;
&lt;/p&gt;

&lt;p style="font: 10pt/1.5 Arial, Helvetica, Sans-Serif; margin: 0px 42px 9px; color: #000000; font-weight: 300; text-align: left"&gt;&lt;span style="-sec-ix-redline: true"&gt;The
value of investments in the fund&#x2019;s portfolio may fall or fail to rise over extended periods of time for a variety of reasons, including
general economic, political or financial market conditions, investor sentiment and market perceptions, government actions, geopolitical
events or changes, outbreaks of infectious illnesses or other widespread public health issues, and factors related to a specific issuer,
geography, industry or sector. These and other factors may lead to increased volatility and reduced liquidity in the fund&#x2019;s portfolio
holdings, may negatively impact the fund&#x2019;s performance, and may exacerbate other risks to which the fund is subject.&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt/1.5 Arial, Helvetica, Sans-Serif; margin: 0px 42px 9px; color: #000000; font-weight: 300; text-align: left"&gt;
The risks associated with bond investments include interest rate risk, which is the risk that the value of the fund&#x2019;s investments is likely to fall if interest rates rise. Bond investments are also subject to credit risk, which is the risk that the issuer of a bond may default on payment of interest or principal. Bond investments may be more susceptible to downgrades or defaults during economic downturns or other periods of economic stress. Interest rate risk is generally greater for longer-term bonds, and credit risk is generally greater for below-investment-grade bonds (a significant part of the fund&#x2019;s investments), which can be more sensitive to changes in markets, credit conditions, and interest rates and may be considered speculative. Mortgage-backed investments, unlike traditional debt investments, are also subject to prepayment risk, which means that they may increase in value less than other bonds when interest rates decline and decline in value more than other bonds when interest rates rise. We may have to invest the 
&lt;/p&gt;



&lt;p&gt;
&lt;br/&gt;
&lt;br/&gt;
&lt;/p&gt;

&lt;div style="border-top: Black 1pt solid; margin: 18pt auto; font-size: 1pt"&gt;&#160;&lt;/div&gt;

&lt;p&gt;&lt;br/&gt;
&lt;br/&gt;
&lt;/p&gt;

&lt;p style="font: 10pt/1.5 Arial, Helvetica, Sans-Serif; margin: 0px 42px 9px; color: #000000; font-weight: 300; text-align: left"&gt;
proceeds from prepaid investments, including mortgage-backed investments, in other investments with less attractive terms and yields. The fund&#x2019;s investments in mortgage-backed securities, and in certain other securities and derivatives, may be or become illiquid. The fund currently has significant investment exposure to privately issued residential and commercial mortgage-backed securities and mortgage-backed securities issued or guaranteed by the U.S. government or its agencies or instrumentalities, which may make the fund&#x2019;s net asset value more susceptible to economic, market, political and other developments affecting the residential and commercial real estate markets and the servicing of mortgage loans secured by real estate properties. During periods of difficult economic conditions, delinquencies and losses on commercial mortgage-backed investments in particular generally increase, including as a result of the effects of those conditions on commercial real estate markets, the ability of commercial tenants to make loan payments, and the ability of a property to attract and retain commercial tenants. The value of international investments traded in foreign currencies may be adversely impacted by fluctuations in exchange rates. International investments, particularly investments in emerging markets, may carry risks associated with potentially less stable economies or governments (such as the risk of seizure by a foreign government, the imposition of currency or other restrictions, or high levels of inflation), and may be or become illiquid.
&lt;/p&gt;

&lt;p style="font: 10pt/1.5 Arial, Helvetica, Sans-Serif; margin: 0px 42px 9px; color: #000000; font-weight: 300; text-align: left"&gt;
Our use of derivatives may increase the risks of investing in the fund by increasing investment exposure (which may be considered leverage) or, in the case of many over-the-counter instruments, because of the potential inability to terminate or sell derivative positions and the potential failure of the other party to the instrument to meet its obligations. The risk of a party failing to meet its obligations may increase if the fund has significant exposure to that counterparty. The value of derivatives may move in unexpected ways due to unanticipated market movements, the use of leverage, imperfect correlation between the derivative instrument and the reference asset or other factors, especially in unusual market conditions, and volatility in the value of derivatives could adversely impact the fund&#x2019;s returns, obligations and exposures. Derivatives are also subject to other risks, including liquidity risk (e.g., liquidity demands arising from the requirement to make payments to a derivative counterparty), operational risk (e.g., settlement issues or system failures) and legal risk (e.g., insufficient legal documentation or contract enforceability&#160;issues).
&lt;/p&gt;

&lt;p style="font: 10pt/1.5 Arial, Helvetica, Sans-Serif; margin: 0px 42px 9px; color: #000000; font-weight: 300; text-align: left"&gt;&lt;span style="-sec-ix-redline: true"&gt;The
fund expects to engage in frequent trading. Funds with high turnover may incur higher transaction costs than funds with relatively lower
turnover, which may detract from performance.&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt/1.5 Arial, Helvetica, Sans-Serif; margin: 0px 42px 9px; color: #000000; font-weight: 300; text-align: left"&gt;
There is no guarantee that the investment techniques, analyses, or judgments that we apply in making investment decisions for the fund will produce the intended outcome or that the investments we select for the fund will perform as well as other securities that were not selected for the fund. We, or the fund&#x2019;s other service providers, may experience disruptions or operating errors that could negatively impact the fund.
&lt;/p&gt;

&lt;p style="font: 10pt/1.5 Arial, Helvetica, Sans-Serif; margin: 0px 42px 9px; color: #000000; font-weight: 300; text-align: left"&gt;&lt;span style="-sec-ix-redline: true"&gt;The
fund may be an investment option for mutual funds that are managed by Franklin Resources, Inc. (Franklin Templeton) and its affiliates
as &#x201c;funds of funds&#x201d; and other investors with substantial investments in the fund. Such shareholders may at times be considered
to control the fund. Dispositions of a large number of shares by these shareholders may adversely affect the fund&#x2019;s liquidity and
net&#160;assets. These redemptions may also force the fund to sell securities, which may increase the fund&#x2019;s brokerage costs.&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt/1.5 Arial, Helvetica, Sans-Serif; margin: 0px 42px 9px; color: #000000; font-weight: 300; text-align: left"&gt;
The fund may not achieve its goal, and it is not intended to be a complete investment program. &lt;span id="xdx_905_err--RiskTextBlock_dU_c20240430__20240430__dei--LegalEntityAxis__custom--S000003893Member__rr--RiskAxis__rr--RiskNotInsuredDepositoryInstitutionMember_zBNWRDadDGr1"&gt;An investment in the fund is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency.&lt;/span&gt;
&lt;/p&gt;

</rr:RiskTextBlock>
    <rr:RiskTextBlock
      contextRef="From2024-04-302024-04-30_custom_S000003893Member_rr_RiskLoseMoneyMember"
      id="Fact000138">It is important to understand that you can lose money by investing in the fund.</rr:RiskTextBlock>
    <rr:RiskTextBlock
      contextRef="From2024-04-302024-04-30_custom_S000003893Member_rr_RiskNotInsuredDepositoryInstitutionMember"
      id="Fact000140">An investment in the fund is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency.</rr:RiskTextBlock>
    <rr:BarChartAndPerformanceTableHeading
      contextRef="From2024-04-302024-04-30_custom_S000003893Member"
      id="Fact000141">Performance</rr:BarChartAndPerformanceTableHeading>
    <rr:PerformanceNarrativeTextBlock
      contextRef="From2024-04-302024-04-30_custom_S000003893Member"
      id="Fact000142">&lt;p id="xdx_A8F_err--PerformanceNarrativeTextBlock_zmcojlWWyokg" style="font: 10pt/1.5 Arial, Helvetica, Sans-Serif; margin: 0px 42px 9px; color: #000000; font-weight: 300; text-align: left"&gt;
&lt;span id="xdx_900_err--PerformanceInformationIllustratesVariabilityOfReturns_dU_c20240430__20240430__dei--LegalEntityAxis__custom--S000003893Member_zn0FmO9gMECi"&gt;The performance information below gives some indication of the risks associated with an investment in the fund by showing the fund&#x2019;s performance year to year and over time.&lt;/span&gt; The performance information does not reflect insurance-related charges or expenses. If it did, performance would be lower. &lt;span id="xdx_909_err--PerformancePastDoesNotIndicateFuture_dU_c20240430__20240430__dei--LegalEntityAxis__custom--S000003893Member_zq1gzsPIpRTa"&gt;Please remember that past performance is not necessarily an indication of future results.&lt;/span&gt; 
&lt;/p&gt;

</rr:PerformanceNarrativeTextBlock>
    <rr:PerformanceInformationIllustratesVariabilityOfReturns
      contextRef="From2024-04-302024-04-30_custom_S000003893Member"
      id="Fact000143">The performance information below gives some indication of the risks associated with an investment in the fund by showing the fund&#x2019;s performance year to year and over time.</rr:PerformanceInformationIllustratesVariabilityOfReturns>
    <rr:PerformancePastDoesNotIndicateFuture
      contextRef="From2024-04-302024-04-30_custom_S000003893Member"
      id="Fact000144">Please remember that past performance is not necessarily an indication of future results.</rr:PerformancePastDoesNotIndicateFuture>
    <rr:BarChartHeading
      contextRef="From2024-04-302024-04-30_custom_S000003893Member"
      id="Fact000145">Annual total returns for class IA shares</rr:BarChartHeading>
    <rr:AnnualReturn2014
      contextRef="From2024-04-302024-04-30_custom_S000003893Member_custom_C000010881Member"
      decimals="INF"
      id="Fact000148"
      unitRef="Ratio">0.0068</rr:AnnualReturn2014>
    <rr:AnnualReturn2015
      contextRef="From2024-04-302024-04-30_custom_S000003893Member_custom_C000010881Member"
      decimals="INF"
      id="Fact000150"
      unitRef="Ratio">-0.0232</rr:AnnualReturn2015>
    <rr:AnnualReturn2016
      contextRef="From2024-04-302024-04-30_custom_S000003893Member_custom_C000010881Member"
      decimals="INF"
      id="Fact000152"
      unitRef="Ratio">0.0576</rr:AnnualReturn2016>
    <rr:AnnualReturn2017
      contextRef="From2024-04-302024-04-30_custom_S000003893Member_custom_C000010881Member"
      decimals="INF"
      id="Fact000154"
      unitRef="Ratio">0.0742</rr:AnnualReturn2017>
    <rr:AnnualReturn2018
      contextRef="From2024-04-302024-04-30_custom_S000003893Member_custom_C000010881Member"
      decimals="INF"
      id="Fact000156"
      unitRef="Ratio">-0.0074</rr:AnnualReturn2018>
    <rr:AnnualReturn2019
      contextRef="From2024-04-302024-04-30_custom_S000003893Member_custom_C000010881Member"
      decimals="INF"
      id="Fact000158"
      unitRef="Ratio">0.1156</rr:AnnualReturn2019>
    <rr:AnnualReturn2020
      contextRef="From2024-04-302024-04-30_custom_S000003893Member_custom_C000010881Member"
      decimals="INF"
      id="Fact000160"
      unitRef="Ratio">-0.0076</rr:AnnualReturn2020>
    <rr:AnnualReturn2021
      contextRef="From2024-04-302024-04-30_custom_S000003893Member_custom_C000010881Member"
      decimals="INF"
      id="Fact000162"
      unitRef="Ratio">-0.0673</rr:AnnualReturn2021>
    <rr:AnnualReturn2022
      contextRef="From2024-04-302024-04-30_custom_S000003893Member_custom_C000010881Member"
      decimals="INF"
      id="Fact000164"
      unitRef="Ratio">-0.0206</rr:AnnualReturn2022>
    <rr:AnnualReturn2023
      contextRef="From2024-04-302024-04-30_custom_S000003893Member_custom_C000010881Member"
      decimals="INF"
      id="Fact000166"
      unitRef="Ratio">0.0501</rr:AnnualReturn2023>
    <rr:YearToDateReturnLabel
      contextRef="From2024-04-302024-04-30_custom_S000003893Member"
      id="Fact000167">Year-to-date performance</rr:YearToDateReturnLabel>
    <rr:BarChartYearToDateReturnDate
      contextRef="From2024-04-302024-04-30_custom_S000003893Member"
      id="Fact000168">2024-03-31</rr:BarChartYearToDateReturnDate>
    <rr:BarChartYearToDateReturn
      contextRef="From2024-04-302024-04-30_custom_S000003893Member"
      decimals="INF"
      id="Fact000169"
      unitRef="Ratio">0.0123</rr:BarChartYearToDateReturn>
    <rr:HighestQuarterlyReturnLabel
      contextRef="From2024-04-302024-04-30_custom_S000003893Member"
      id="Fact000170">Best calendar quarter</rr:HighestQuarterlyReturnLabel>
    <rr:BarChartHighestQuarterlyReturnDate
      contextRef="From2024-04-302024-04-30_custom_S000003893Member"
      id="Fact000171">2020-06-30</rr:BarChartHighestQuarterlyReturnDate>
    <rr:BarChartHighestQuarterlyReturn
      contextRef="From2024-04-302024-04-30_custom_S000003893Member"
      decimals="INF"
      id="Fact000172"
      unitRef="Ratio">0.0680</rr:BarChartHighestQuarterlyReturn>
    <rr:LowestQuarterlyReturnLabel
      contextRef="From2024-04-302024-04-30_custom_S000003893Member"
      id="Fact000173">Worst calendar quarter</rr:LowestQuarterlyReturnLabel>
    <rr:BarChartLowestQuarterlyReturnDate
      contextRef="From2024-04-302024-04-30_custom_S000003893Member"
      id="Fact000174">2020-03-31</rr:BarChartLowestQuarterlyReturnDate>
    <rr:BarChartLowestQuarterlyReturn
      contextRef="From2024-04-302024-04-30_custom_S000003893Member"
      decimals="INF"
      id="Fact000175"
      unitRef="Ratio">-0.1279</rr:BarChartLowestQuarterlyReturn>
    <rr:PerformanceTableHeading
      contextRef="From2024-04-302024-04-30_custom_S000003893Member"
      id="Fact000176">Average
annual total returns

(for
periods ended 12/31/23)</rr:PerformanceTableHeading>
    <rr:AverageAnnualReturnYear01
      contextRef="From2024-04-302024-04-30_custom_S000003893Member_custom_C000010881Member"
      decimals="INF"
      id="Fact000178"
      unitRef="Ratio">0.0501</rr:AverageAnnualReturnYear01>
    <rr:AverageAnnualReturnYear05
      contextRef="From2024-04-302024-04-30_custom_S000003893Member_custom_C000010881Member"
      decimals="INF"
      id="Fact000179"
      unitRef="Ratio">0.0121</rr:AverageAnnualReturnYear05>
    <rr:AverageAnnualReturnYear10
      contextRef="From2024-04-302024-04-30_custom_S000003893Member_custom_C000010881Member"
      decimals="INF"
      id="Fact000180"
      unitRef="Ratio">0.0165</rr:AverageAnnualReturnYear10>
    <rr:AverageAnnualReturnYear01
      contextRef="From2024-04-302024-04-30_custom_S000003893Member_custom_C000010882Member"
      decimals="INF"
      id="Fact000181"
      unitRef="Ratio">0.0482</rr:AverageAnnualReturnYear01>
    <rr:AverageAnnualReturnYear05
      contextRef="From2024-04-302024-04-30_custom_S000003893Member_custom_C000010882Member"
      decimals="INF"
      id="Fact000182"
      unitRef="Ratio">0.0098</rr:AverageAnnualReturnYear05>
    <rr:AverageAnnualReturnYear10
      contextRef="From2024-04-302024-04-30_custom_S000003893Member_custom_C000010882Member"
      decimals="INF"
      id="Fact000183"
      unitRef="Ratio">0.0141</rr:AverageAnnualReturnYear10>
    <rr:AverageAnnualReturnYear01
      contextRef="From2024-04-302024-04-30_custom_S000003893Member_custom_ICEBofAUSTreasuryBillIndexMember"
      decimals="INF"
      id="Fact000184"
      unitRef="Ratio">0.0508</rr:AverageAnnualReturnYear01>
    <rr:AverageAnnualReturnYear05
      contextRef="From2024-04-302024-04-30_custom_S000003893Member_custom_ICEBofAUSTreasuryBillIndexMember"
      decimals="INF"
      id="Fact000185"
      unitRef="Ratio">0.0190</rr:AverageAnnualReturnYear05>
    <rr:AverageAnnualReturnYear10
      contextRef="From2024-04-302024-04-30_custom_S000003893Member_custom_ICEBofAUSTreasuryBillIndexMember"
      decimals="INF"
      id="Fact000186"
      unitRef="Ratio">0.0126</rr:AverageAnnualReturnYear10>
    <rr:AverageAnnualReturnYear01
      contextRef="From2024-04-302024-04-30_custom_S000003893Member_custom_BUSAggregateBondIndexMember"
      decimals="INF"
      id="Fact000187"
      unitRef="Ratio">0.0553</rr:AverageAnnualReturnYear01>
    <rr:AverageAnnualReturnYear05
      contextRef="From2024-04-302024-04-30_custom_S000003893Member_custom_BUSAggregateBondIndexMember"
      decimals="INF"
      id="Fact000188"
      unitRef="Ratio">0.0110</rr:AverageAnnualReturnYear05>
    <rr:AverageAnnualReturnYear10
      contextRef="From2024-04-302024-04-30_custom_S000003893Member_custom_BUSAggregateBondIndexMember"
      decimals="INF"
      id="Fact000189"
      unitRef="Ratio">0.0181</rr:AverageAnnualReturnYear10>
    <rr:PerformanceTableClosingTextBlock
      contextRef="From2024-04-302024-04-30_custom_S000003893Member"
      id="Fact000190">&lt;div id="xdx_A83_err--PerformanceTableClosingTextBlock_zQbY1t5kgKH3"&gt;&lt;/div&gt;
&lt;table style="font: 300 9pt/1.5 Arial, Helvetica, Sans-Serif; margin-left: 10px; width: 90%"&gt;
&lt;tr style="vertical-align: top"&gt;
&lt;td style="width: 25px; text-align: right"&gt;&lt;/td&gt;
&lt;td&gt;&lt;span style="-sec-ix-redline: true"&gt;ICE BofA Indexes: ICE Data Indices, LLC (&#x201c;ICE BofA&#x201d;), used with permission. ICE BofA permits use of the ICE BofA indices
and related data on an &#x201c;as is&#x201d; basis; makes no warranties regarding same; does not guarantee the suitability, quality, accuracy,
timeliness, and/or completeness of the ICE BofA indices or any data included in, related to, or derived therefrom; assumes no liability
in connection with the use of the foregoing; and does not sponsor, endorse, or recommend Putnam Investments or Franklin Templeton, or
any of their products or services.&lt;/span&gt;&lt;/td&gt;

&lt;/tr&gt;
&lt;/table&gt;



&lt;p&gt;
&lt;br/&gt;
&lt;br/&gt;
&lt;/p&gt;

&lt;div style="border-top: Black 1pt solid; margin: 18pt auto; font-size: 1pt"&gt;&#160;&lt;/div&gt;

&lt;p&gt;&lt;br/&gt;
&lt;br/&gt;
&lt;/p&gt;

&lt;table style="font: 300 9pt/1.5 Arial, Helvetica, Sans-Serif; margin-left: 10px; width: 90%"&gt;
&lt;tr style="vertical-align: top"&gt;
&lt;td style="width: 25px; text-align: right"&gt;


&lt;/td&gt;
&lt;td&gt;
All Bloomberg indices are provided by Bloomberg Index Services Limited.

&lt;/td&gt;

&lt;/tr&gt;
&lt;/table&gt;

&lt;table style="font: 300 9pt/1.5 Arial, Helvetica, Sans-Serif; margin-left: 10px; width: 90%"&gt;
&lt;tr style="vertical-align: top"&gt;
&lt;td style="width: 25px; text-align: right"&gt;


&lt;/td&gt;
&lt;td&gt;
BLOOMBERG&#xae; is a trademark and service mark of Bloomberg Finance L.P. and its affiliates (collectively &#x201c;Bloomberg&#x201d;). Bloomberg or Bloomberg&#x2019;s licensors, own all proprietary rights in the Bloomberg Indices. Neither Bloomberg nor Bloomberg&#x2019;s licensors approve or endorse this material, or guarantee the accuracy or completeness of any information herein, or make any warranty, express or implied, as to the results to be obtained therefrom, and to the maximum extent allowed by law, neither shall have any liability or responsibility for injury or damages arising in connection therewith.

&lt;/td&gt;

&lt;/tr&gt;
&lt;/table&gt;

</rr:PerformanceTableClosingTextBlock>
    <rr:RiskReturnHeading
      contextRef="From2024-04-302024-04-30_custom_S000003879Member"
      id="Fact000193">Fund summary</rr:RiskReturnHeading>
    <rr:ObjectiveHeading
      contextRef="From2024-04-302024-04-30_custom_S000003879Member"
      id="Fact000194">Goal</rr:ObjectiveHeading>
    <rr:ObjectivePrimaryTextBlock
      contextRef="From2024-04-302024-04-30_custom_S000003879Member"
      id="Fact000195">&lt;p id="xdx_A80_err--ObjectivePrimaryTextBlock_z2HM9GWOhU6" style="font: 10pt/1.5 Arial, Helvetica, Sans-Serif; margin: 0px 42px 9px; color: #000000; font-weight: 300; text-align: left"&gt;
Putnam VT Emerging Markets Equity Fund seeks long-term capital appreciation.
&lt;/p&gt;

</rr:ObjectivePrimaryTextBlock>
    <rr:ExpenseHeading
      contextRef="From2024-04-302024-04-30_custom_S000003879Member"
      id="Fact000196">Fees and expenses</rr:ExpenseHeading>
    <rr:ExpenseNarrativeTextBlock
      contextRef="From2024-04-302024-04-30_custom_S000003879Member"
      id="Fact000197">&lt;p id="xdx_A8E_err--ExpenseNarrativeTextBlock_zk8OYtQcKn54" style="font: 10pt/1.5 Arial, Helvetica, Sans-Serif; margin: 0px 42px 9px; color: #000000; font-weight: 300; text-align: left"&gt;
The following table describes the fees and expenses you may pay if you buy, hold and sell shares of the fund. You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in the tables and examples below. The fees and expenses information does not reflect insurance-related charges or expenses borne by contract holders indirectly investing in the fund. If it did, expenses would be higher.
&lt;/p&gt;

</rr:ExpenseNarrativeTextBlock>
    <rr:OperatingExpensesCaption
      contextRef="From2024-04-302024-04-30_custom_S000003879Member"
      id="Fact000198">
Annual fund operating expenses



(expenses you pay each year as a percentage of the value of your investment)
</rr:OperatingExpensesCaption>
    <rr:ManagementFeesOverAssets
      contextRef="From2024-04-302024-04-30_custom_S000003879Member_custom_C000010853Member"
      decimals="INF"
      id="Fact000200"
      unitRef="Ratio">0.0092</rr:ManagementFeesOverAssets>
    <rr:DistributionAndService12b1FeesOverAssets
      contextRef="From2024-04-302024-04-30_custom_S000003879Member_custom_C000010853Member"
      decimals="INF"
      id="Fact000201"
      unitRef="Ratio">0</rr:DistributionAndService12b1FeesOverAssets>
    <rr:OtherExpensesOverAssets
      contextRef="From2024-04-302024-04-30_custom_S000003879Member_custom_C000010853Member"
      decimals="INF"
      id="Fact000202"
      unitRef="Ratio">0.0063</rr:OtherExpensesOverAssets>
    <rr:ExpensesOverAssets
      contextRef="From2024-04-302024-04-30_custom_S000003879Member_custom_C000010853Member"
      decimals="INF"
      id="Fact000203"
      unitRef="Ratio">0.0155</rr:ExpensesOverAssets>
    <rr:FeeWaiverOrReimbursementOverAssets
      contextRef="From2024-04-302024-04-30_custom_S000003879Member_custom_C000010853Member"
      decimals="INF"
      id="Fact000204"
      unitRef="Ratio">-0.0046</rr:FeeWaiverOrReimbursementOverAssets>
    <rr:NetExpensesOverAssets
      contextRef="From2024-04-302024-04-30_custom_S000003879Member_custom_C000010853Member"
      decimals="INF"
      id="Fact000205"
      unitRef="Ratio">0.0109</rr:NetExpensesOverAssets>
    <rr:ManagementFeesOverAssets
      contextRef="From2024-04-302024-04-30_custom_S000003879Member_custom_C000010854Member"
      decimals="INF"
      id="Fact000206"
      unitRef="Ratio">0.0092</rr:ManagementFeesOverAssets>
    <rr:DistributionAndService12b1FeesOverAssets
      contextRef="From2024-04-302024-04-30_custom_S000003879Member_custom_C000010854Member"
      decimals="INF"
      id="Fact000207"
      unitRef="Ratio">0.0025</rr:DistributionAndService12b1FeesOverAssets>
    <rr:OtherExpensesOverAssets
      contextRef="From2024-04-302024-04-30_custom_S000003879Member_custom_C000010854Member"
      decimals="INF"
      id="Fact000208"
      unitRef="Ratio">0.0063</rr:OtherExpensesOverAssets>
    <rr:ExpensesOverAssets
      contextRef="From2024-04-302024-04-30_custom_S000003879Member_custom_C000010854Member"
      decimals="INF"
      id="Fact000209"
      unitRef="Ratio">0.0180</rr:ExpensesOverAssets>
    <rr:FeeWaiverOrReimbursementOverAssets
      contextRef="From2024-04-302024-04-30_custom_S000003879Member_custom_C000010854Member"
      decimals="INF"
      id="Fact000210"
      unitRef="Ratio">-0.0046</rr:FeeWaiverOrReimbursementOverAssets>
    <rr:NetExpensesOverAssets
      contextRef="From2024-04-302024-04-30_custom_S000003879Member_custom_C000010854Member"
      decimals="INF"
      id="Fact000211"
      unitRef="Ratio">0.0134</rr:NetExpensesOverAssets>
    <rr:FeeWaiverOrReimbursementOverAssetsDateOfTermination
      contextRef="From2024-04-302024-04-30_custom_S000003879Member"
      id="Fact000213">4/30/25</rr:FeeWaiverOrReimbursementOverAssetsDateOfTermination>
    <rr:ExpenseExampleHeading
      contextRef="From2024-04-302024-04-30_custom_S000003879Member"
      id="Fact000214">Example</rr:ExpenseExampleHeading>
    <rr:ExpenseExampleNarrativeTextBlock
      contextRef="From2024-04-302024-04-30_custom_S000003879Member"
      id="Fact000215">&lt;p id="xdx_A82_err--ExpenseExampleNarrativeTextBlock_z928BksLyd4c" style="font: 10pt/1.5 Arial, Helvetica, Sans-Serif; margin: 0px 42px 9px; color: #000000; font-weight: 300; text-align: left"&gt;
The following hypothetical example is intended to help you compare the cost of investing in the fund with the cost of investing in other funds. The example does not reflect insurance-related charges or expenses. If it did, expenses would be higher. It assumes that you invest $10,000 in the fund for the time periods indicated and then redeem or hold all your shares at the end of those periods. It assumes a 5% return on your investment each year and that the fund&#x2019;s operating expenses remain the same. Only the first year of each period in the example takes into account the expense reimbursement described above. Your actual costs may be higher or lower.
&lt;/p&gt;

</rr:ExpenseExampleNarrativeTextBlock>
    <rr:ExpenseExampleYear01
      contextRef="From2024-04-302024-04-30_custom_S000003879Member_custom_C000010853Member"
      decimals="0"
      id="Fact000217"
      unitRef="USD">111</rr:ExpenseExampleYear01>
    <rr:ExpenseExampleYear03
      contextRef="From2024-04-302024-04-30_custom_S000003879Member_custom_C000010853Member"
      decimals="0"
      id="Fact000218"
      unitRef="USD">444</rr:ExpenseExampleYear03>
    <rr:ExpenseExampleYear05
      contextRef="From2024-04-302024-04-30_custom_S000003879Member_custom_C000010853Member"
      decimals="0"
      id="Fact000219"
      unitRef="USD">801</rr:ExpenseExampleYear05>
    <rr:ExpenseExampleYear10
      contextRef="From2024-04-302024-04-30_custom_S000003879Member_custom_C000010853Member"
      decimals="0"
      id="Fact000220"
      unitRef="USD">1806</rr:ExpenseExampleYear10>
    <rr:ExpenseExampleYear01
      contextRef="From2024-04-302024-04-30_custom_S000003879Member_custom_C000010854Member"
      decimals="0"
      id="Fact000221"
      unitRef="USD">136</rr:ExpenseExampleYear01>
    <rr:ExpenseExampleYear03
      contextRef="From2024-04-302024-04-30_custom_S000003879Member_custom_C000010854Member"
      decimals="0"
      id="Fact000222"
      unitRef="USD">522</rr:ExpenseExampleYear03>
    <rr:ExpenseExampleYear05
      contextRef="From2024-04-302024-04-30_custom_S000003879Member_custom_C000010854Member"
      decimals="0"
      id="Fact000223"
      unitRef="USD">932</rr:ExpenseExampleYear05>
    <rr:ExpenseExampleYear10
      contextRef="From2024-04-302024-04-30_custom_S000003879Member_custom_C000010854Member"
      decimals="0"
      id="Fact000224"
      unitRef="USD">2078</rr:ExpenseExampleYear10>
    <rr:PortfolioTurnoverHeading
      contextRef="From2024-04-302024-04-30_custom_S000003879Member"
      id="Fact000225">Portfolio turnover</rr:PortfolioTurnoverHeading>
    <rr:PortfolioTurnoverTextBlock
      contextRef="From2024-04-302024-04-30_custom_S000003879Member"
      id="Fact000226">&lt;p id="xdx_A8C_err--PortfolioTurnoverTextBlock_zNckSdc5Fmd7" style="font: 10pt/1.5 Arial, Helvetica, Sans-Serif; margin: 0px 42px 9px; color: #000000; font-weight: 300; text-align: left"&gt;&lt;span style="-sec-ix-redline: true"&gt;The
fund pays transaction-related costs, such as commissions, when it buys and sells securities (or &#x201c;turns over&#x201d; its portfolio).
A higher turnover rate may indicate higher transaction costs. These costs, which are not reflected in annual fund operating expenses
or the above example, affect fund performance. The fund&#x2019;s turnover rate in the most recent fiscal year was &lt;span id="xdx_908_err--PortfolioTurnoverRate_dU_c20240430__20240430__dei--LegalEntityAxis__custom--S000003879Member_zkqVFdn09Qf5"&gt;53%&lt;/span&gt;.&lt;/span&gt;&lt;/p&gt;

</rr:PortfolioTurnoverTextBlock>
    <rr:PortfolioTurnoverRate
      contextRef="From2024-04-302024-04-30_custom_S000003879Member"
      decimals="INF"
      id="Fact000227"
      unitRef="Ratio">0.53</rr:PortfolioTurnoverRate>
    <rr:StrategyHeading
      contextRef="From2024-04-302024-04-30_custom_S000003879Member"
      id="Fact000228">Investments, risks, and performance</rr:StrategyHeading>
    <rr:StrategyNarrativeTextBlock
      contextRef="From2024-04-302024-04-30_custom_S000003879Member"
      id="Fact000229">&lt;p id="xdx_A8F_err--StrategyNarrativeTextBlock_ztZddP4VRdke" style="font: 600 10pt/1.5 Arial, Helvetica, Sans-Serif; margin: 15px 42px 0px; color: #000000"&gt;
&lt;b&gt;Investments&lt;/b&gt;
&lt;/p&gt;

&lt;p style="font: 10pt/1.5 Arial, Helvetica, Sans-Serif; margin: 0px 42px 9px; color: #000000; font-weight: 300; text-align: left"&gt;
We invest mainly in common stocks (growth or value stocks or both) of emerging market companies of any size that we believe have favorable investment potential. For example, we may purchase stocks of companies with stock prices that reflect a value lower than that which we place on the company. We may also consider other factors that we believe will cause the stock price to rise. Under normal circumstances, we invest at least 80% of the fund&#x2019;s net&#160;assets in equity securities of emerging market companies. This policy may be changed only after 60 days&#x2019; notice to shareholders.
&lt;/p&gt;

&lt;p style="font: 10pt/1.5 Arial, Helvetica, Sans-Serif; margin: 0px 42px 9px; color: #000000; font-weight: 300; text-align: left"&gt;&lt;span style="-sec-ix-redline: true"&gt;Emerging
markets include countries in the MSCI Emerging Market Index or that we consider to be emerging markets based on our evaluation of their
level of economic development or the size and nature of their securities markets. We may consider, among other factors, a company&#x2019;s
valuation, financial strength, growth potential, competitive position in its industry, projected future earnings, cash flows and dividends
when deciding whether to buy or sell investments. We may also use derivatives, such as futures, options, warrants and swap contracts,
for both hedging and non-hedging purposes.&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt/1.5 Arial, Helvetica, Sans-Serif; margin: 0px 42px 9px; color: #000000; font-weight: 300; text-align: left"&gt;&lt;span style="-sec-ix-redline: true"&gt;The
fund is "non-diversified," which means it may invest a greater percentage of its assets in fewer issuers than a "diversified" fund.&lt;/span&gt;&lt;/p&gt;

</rr:StrategyNarrativeTextBlock>
    <rr:RiskHeading
      contextRef="From2024-04-302024-04-30_custom_S000003879Member"
      id="Fact000230">Risks</rr:RiskHeading>
    <rr:RiskTextBlock
      contextRef="From2024-04-302024-04-30_custom_S000003879Member"
      id="Fact000231">&lt;p id="xdx_A8E_err--RiskTextBlock_zRoqtnFD1yqe" style="font: 10pt/1.5 Arial, Helvetica, Sans-Serif; margin: 0px 42px 9px; color: #000000; font-weight: 300; text-align: left"&gt;
&lt;span id="xdx_901_err--RiskTextBlock_dU_c20240430__20240430__dei--LegalEntityAxis__custom--S000003879Member__rr--RiskAxis__rr--RiskLoseMoneyMember_z8nPkSahjcG1"&gt;It is important to understand that you can lose money by investing in the fund.&lt;/span&gt;
&lt;/p&gt;

&lt;p style="font: 10pt/1.5 Arial, Helvetica, Sans-Serif; margin: 0px 42px 9px; color: #000000; font-weight: 300; text-align: left"&gt;
The value of investments in the fund&#x2019;s portfolio may fall or fail to rise over extended periods of time for a variety of reasons, including general economic, political or financial market conditions, investor sentiment and market perceptions, government actions, geopolitical events or changes, outbreaks of infectious illnesses or other widespread public health issues, and factors related to a specific issuer, geography, industry or sector. These and other factors may lead to increased volatility and reduced liquidity in the fund's portfolio holdings, may negatively impact the fund&#x2019;s performance, and may exacerbate other risks to which the fund is subject. 
&lt;/p&gt;

&lt;p style="font: 10pt/1.5 Arial, Helvetica, Sans-Serif; margin: 0px 42px 9px; color: #000000; font-weight: 300; text-align: left"&gt;&lt;span style="-sec-ix-redline: true"&gt;Growth
stocks may be more susceptible to earnings disappointments, and value stocks may fail to rebound. These risks are generally greater for
small and midsize companies. From time to time, the fund may invest a significant portion of its assets in companies in one or more related
industries, sectors or geographic regions, such as Asian or Pacific Basin countries, which would make the fund more vulnerable to adverse
developments affecting those regions, industries or sectors.&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt/1.5 Arial, Helvetica, Sans-Serif; margin: 0px 42px 9px; color: #000000; font-weight: 300; text-align: left"&gt;&lt;span style="-sec-ix-redline: true"&gt;The
value of international investments traded in foreign currencies may be adversely impacted by fluctuations in exchange rates. International
investments, particularly investments in emerging markets, may carry risks associated with potentially less stable&lt;/span&gt;&lt;/p&gt;



&lt;p&gt;
&lt;br/&gt;
&lt;br/&gt;
&lt;/p&gt;

&lt;div style="border-top: Black 1pt solid; margin: 18pt auto; font-size: 1pt"&gt;&#160;&lt;/div&gt;

&lt;p&gt;&lt;br/&gt;
&lt;br/&gt;
&lt;/p&gt;

&lt;p style="font: 10pt/1.5 Arial, Helvetica, Sans-Serif; margin: 0px 42px 9px; color: #000000; font-weight: 300; text-align: left"&gt;&lt;span style="-sec-ix-redline: true"&gt;economies
or governments (such as the risk of seizure by a foreign government, the imposition of currency or other restrictions, or high levels
of inflation), and may be or become illiquid.&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt/1.5 Arial, Helvetica, Sans-Serif; margin: 0px 42px 9px; color: #000000; font-weight: 300; text-align: left"&gt;
&lt;span id="xdx_900_err--RiskTextBlock_dU_c20240430__20240430__dei--LegalEntityAxis__custom--S000003879Member__rr--RiskAxis__rr--RiskNondiversifiedStatusMember_zLCu7SYKsej9"&gt;As a non-diversified fund, the fund may invest in fewer issuers and is more vulnerable than a more broadly diversified fund to fluctuations in the values of the securities it holds&lt;/span&gt;.
&lt;/p&gt;

&lt;p style="font: 10pt/1.5 Arial, Helvetica, Sans-Serif; margin: 0px 42px 9px; color: #000000; font-weight: 300; text-align: left"&gt;
Our use of derivatives may increase the risks of investing in the fund by increasing investment exposure (which may be considered leverage) or, in the case of many over-the-counter instruments, because of the potential inability to terminate or sell derivative positions and the potential failure of the other party to the instrument to meet its obligations. The risk of a party failing to meet its obligations may increase if the fund has significant exposure to that counterparty. The value of derivatives may move in unexpected ways due to unanticipated market movements, the use of leverage, imperfect correlation between the derivative instrument and the reference asset or other factors, especially in unusual market conditions, and volatility in the value of derivatives could adversely impact the fund&#x2019;s returns, obligations and exposures. Derivatives are also subject to other risks, including liquidity risk (e.g., liquidity demands arising from the requirement to make payments to a derivative counterparty), operational risk (e.g., settlement issues or system failures), and legal risk (e.g., insufficient legal documentation or contract enforceability&#160;issues).
&lt;/p&gt;

&lt;p style="font: 10pt/1.5 Arial, Helvetica, Sans-Serif; margin: 0px 42px 9px; color: #000000; font-weight: 300; text-align: left"&gt;
There is no guarantee that the investment techniques, analyses, or judgments that we apply in making investment decisions for the fund will produce the intended outcome or that the investments we select for the fund will perform as well as other securities that were not selected for the fund. We, or the fund's other service providers, may experience disruptions or operating errors that could negatively impact the fund.
&lt;/p&gt;

&lt;p style="font: 10pt/1.5 Arial, Helvetica, Sans-Serif; margin: 0px 42px 9px; color: #000000; font-weight: 300; text-align: left"&gt;&lt;span style="-sec-ix-redline: true"&gt;The
fund may be an investment option for mutual funds that are managed by Franklin Resources, Inc. (Franklin Templeton) and its affiliates
as &#x201c;funds of funds&#x201d; and other investors with substantial investments in the fund. Such shareholders may at times be considered
to control the fund. Dispositions of a large number of shares by these shareholders may adversely affect the fund's liquidity and
net&#160;assets. These redemptions may also force the fund to sell securities, which may increase the fund's brokerage costs.&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt/1.5 Arial, Helvetica, Sans-Serif; margin: 0px 42px 9px; color: #000000; font-weight: 300; text-align: left"&gt;
The fund may not achieve its goal, and it is not intended to be a complete investment program. &lt;span id="xdx_903_err--RiskTextBlock_dU_c20240430__20240430__dei--LegalEntityAxis__custom--S000003879Member__rr--RiskAxis__rr--RiskNotInsuredDepositoryInstitutionMember_zCMLeewDVkU3"&gt;An investment in the fund is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency.&lt;/span&gt;
&lt;/p&gt;

</rr:RiskTextBlock>
    <rr:RiskTextBlock
      contextRef="From2024-04-302024-04-30_custom_S000003879Member_rr_RiskLoseMoneyMember"
      id="Fact000232">It is important to understand that you can lose money by investing in the fund.</rr:RiskTextBlock>
    <rr:RiskTextBlock
      contextRef="From2024-04-302024-04-30_custom_S000003879Member_rr_RiskNondiversifiedStatusMember"
      id="Fact000234">As a non-diversified fund, the fund may invest in fewer issuers and is more vulnerable than a more broadly diversified fund to fluctuations in the values of the securities it holds</rr:RiskTextBlock>
    <rr:RiskTextBlock
      contextRef="From2024-04-302024-04-30_custom_S000003879Member_rr_RiskNotInsuredDepositoryInstitutionMember"
      id="Fact000235">An investment in the fund is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency.</rr:RiskTextBlock>
    <rr:BarChartAndPerformanceTableHeading
      contextRef="From2024-04-302024-04-30_custom_S000003879Member"
      id="Fact000236">Performance</rr:BarChartAndPerformanceTableHeading>
    <rr:PerformanceNarrativeTextBlock
      contextRef="From2024-04-302024-04-30_custom_S000003879Member"
      id="Fact000237">&lt;p id="xdx_A80_err--PerformanceNarrativeTextBlock_znW9QTtbng91" style="font: 10pt/1.5 Arial, Helvetica, Sans-Serif; margin: 0px 42px 9px; color: #000000; font-weight: 300; text-align: left"&gt;
&lt;span id="xdx_90B_err--PerformanceInformationIllustratesVariabilityOfReturns_dU_c20240430__20240430__dei--LegalEntityAxis__custom--S000003879Member_zF5pr89rZtMa"&gt;The performance information below gives some indication of the risks associated with an investment in the fund by showing the fund&#x2019;s performance year to year and over time.&lt;/span&gt; Before April 30, 2020, the fund was managed with a different investment strategy and may have achieved different performance results under its current strategy from that shown for periods before this date. The performance information does not reflect insurance-related charges or expenses. If it did, performance would be lower. &lt;span id="xdx_90B_err--PerformancePastDoesNotIndicateFuture_dU_c20240430__20240430__dei--LegalEntityAxis__custom--S000003879Member_z7aN1i6qJRBf"&gt;Please remember that past performance is not necessarily an indication of future results.&lt;/span&gt;
&lt;/p&gt;

</rr:PerformanceNarrativeTextBlock>
    <rr:PerformanceInformationIllustratesVariabilityOfReturns
      contextRef="From2024-04-302024-04-30_custom_S000003879Member"
      id="Fact000238">The performance information below gives some indication of the risks associated with an investment in the fund by showing the fund&#x2019;s performance year to year and over time.</rr:PerformanceInformationIllustratesVariabilityOfReturns>
    <rr:PerformancePastDoesNotIndicateFuture
      contextRef="From2024-04-302024-04-30_custom_S000003879Member"
      id="Fact000239">Please remember that past performance is not necessarily an indication of future results.</rr:PerformancePastDoesNotIndicateFuture>
    <rr:BarChartHeading
      contextRef="From2024-04-302024-04-30_custom_S000003879Member"
      id="Fact000240">Annual total returns for class IA shares</rr:BarChartHeading>
    <rr:AnnualReturn2014
      contextRef="From2024-04-302024-04-30_custom_S000003879Member_custom_C000010853Member"
      decimals="INF"
      id="Fact000243"
      unitRef="Ratio">-0.0590</rr:AnnualReturn2014>
    <rr:AnnualReturn2015
      contextRef="From2024-04-302024-04-30_custom_S000003879Member_custom_C000010853Member"
      decimals="INF"
      id="Fact000245"
      unitRef="Ratio">0.0133</rr:AnnualReturn2015>
    <rr:AnnualReturn2016
      contextRef="From2024-04-302024-04-30_custom_S000003879Member_custom_C000010853Member"
      decimals="INF"
      id="Fact000247"
      unitRef="Ratio">-0.0646</rr:AnnualReturn2016>
    <rr:AnnualReturn2017
      contextRef="From2024-04-302024-04-30_custom_S000003879Member_custom_C000010853Member"
      decimals="INF"
      id="Fact000249"
      unitRef="Ratio">0.3537</rr:AnnualReturn2017>
    <rr:AnnualReturn2018
      contextRef="From2024-04-302024-04-30_custom_S000003879Member_custom_C000010853Member"
      decimals="INF"
      id="Fact000251"
      unitRef="Ratio">-0.1840</rr:AnnualReturn2018>
    <rr:AnnualReturn2019
      contextRef="From2024-04-302024-04-30_custom_S000003879Member_custom_C000010853Member"
      decimals="INF"
      id="Fact000253"
      unitRef="Ratio">0.2521</rr:AnnualReturn2019>
    <rr:AnnualReturn2020
      contextRef="From2024-04-302024-04-30_custom_S000003879Member_custom_C000010853Member"
      decimals="INF"
      id="Fact000255"
      unitRef="Ratio">0.2825</rr:AnnualReturn2020>
    <rr:AnnualReturn2021
      contextRef="From2024-04-302024-04-30_custom_S000003879Member_custom_C000010853Member"
      decimals="INF"
      id="Fact000257"
      unitRef="Ratio">-0.0398</rr:AnnualReturn2021>
    <rr:AnnualReturn2022
      contextRef="From2024-04-302024-04-30_custom_S000003879Member_custom_C000010853Member"
      decimals="INF"
      id="Fact000259"
      unitRef="Ratio">-0.2724</rr:AnnualReturn2022>
    <rr:AnnualReturn2023
      contextRef="From2024-04-302024-04-30_custom_S000003879Member_custom_C000010853Member"
      decimals="INF"
      id="Fact000261"
      unitRef="Ratio">0.1163</rr:AnnualReturn2023>
    <rr:YearToDateReturnLabel
      contextRef="From2024-04-302024-04-30_custom_S000003879Member"
      id="Fact000262">Year-to-date performance
through</rr:YearToDateReturnLabel>
    <rr:BarChartYearToDateReturnDate
      contextRef="From2024-04-302024-04-30_custom_S000003879Member"
      id="Fact000263">2024-03-31</rr:BarChartYearToDateReturnDate>
    <rr:BarChartYearToDateReturn
      contextRef="From2024-04-302024-04-30_custom_S000003879Member"
      decimals="INF"
      id="Fact000264"
      unitRef="Ratio">0.0757</rr:BarChartYearToDateReturn>
    <rr:HighestQuarterlyReturnLabel
      contextRef="From2024-04-302024-04-30_custom_S000003879Member"
      id="Fact000265">Best calendar quarter</rr:HighestQuarterlyReturnLabel>
    <rr:BarChartHighestQuarterlyReturnDate
      contextRef="From2024-04-302024-04-30_custom_S000003879Member"
      id="Fact000266">2020-06-30</rr:BarChartHighestQuarterlyReturnDate>
    <rr:BarChartHighestQuarterlyReturn
      contextRef="From2024-04-302024-04-30_custom_S000003879Member"
      decimals="INF"
      id="Fact000267"
      unitRef="Ratio">0.2139</rr:BarChartHighestQuarterlyReturn>
    <rr:LowestQuarterlyReturnLabel
      contextRef="From2024-04-302024-04-30_custom_S000003879Member"
      id="Fact000268">Worst calendar quarter</rr:LowestQuarterlyReturnLabel>
    <rr:BarChartLowestQuarterlyReturnDate
      contextRef="From2024-04-302024-04-30_custom_S000003879Member"
      id="Fact000269">2020-03-31</rr:BarChartLowestQuarterlyReturnDate>
    <rr:BarChartLowestQuarterlyReturn
      contextRef="From2024-04-302024-04-30_custom_S000003879Member"
      decimals="INF"
      id="Fact000270"
      unitRef="Ratio">-0.2147</rr:BarChartLowestQuarterlyReturn>
    <rr:PerformanceTableHeading
      contextRef="From2024-04-302024-04-30_custom_S000003879Member"
      id="Fact000271">Average
annual total returns 
(for periods ended 12/31/23)</rr:PerformanceTableHeading>
    <rr:AverageAnnualReturnYear01
      contextRef="From2024-04-302024-04-30_custom_S000003879Member_custom_C000010853Member"
      decimals="INF"
      id="Fact000273"
      unitRef="Ratio">0.1163</rr:AverageAnnualReturnYear01>
    <rr:AverageAnnualReturnYear05
      contextRef="From2024-04-302024-04-30_custom_S000003879Member_custom_C000010853Member"
      decimals="INF"
      id="Fact000274"
      unitRef="Ratio">0.0460</rr:AverageAnnualReturnYear05>
    <rr:AverageAnnualReturnYear10
      contextRef="From2024-04-302024-04-30_custom_S000003879Member_custom_C000010853Member"
      decimals="INF"
      id="Fact000275"
      unitRef="Ratio">0.0212</rr:AverageAnnualReturnYear10>
    <rr:AverageAnnualReturnYear01
      contextRef="From2024-04-302024-04-30_custom_S000003879Member_custom_C000010854Member"
      decimals="INF"
      id="Fact000276"
      unitRef="Ratio">0.1139</rr:AverageAnnualReturnYear01>
    <rr:AverageAnnualReturnYear05
      contextRef="From2024-04-302024-04-30_custom_S000003879Member_custom_C000010854Member"
      decimals="INF"
      id="Fact000277"
      unitRef="Ratio">0.0435</rr:AverageAnnualReturnYear05>
    <rr:AverageAnnualReturnYear10
      contextRef="From2024-04-302024-04-30_custom_S000003879Member_custom_C000010854Member"
      decimals="INF"
      id="Fact000278"
      unitRef="Ratio">0.0187</rr:AverageAnnualReturnYear10>
    <rr:AverageAnnualReturnYear01
      contextRef="From2024-04-302024-04-30_custom_S000003879Member_custom_MSCIEmergingMarketsIndexMember"
      decimals="INF"
      id="Fact000279"
      unitRef="Ratio">0.0983</rr:AverageAnnualReturnYear01>
    <rr:AverageAnnualReturnYear05
      contextRef="From2024-04-302024-04-30_custom_S000003879Member_custom_MSCIEmergingMarketsIndexMember"
      decimals="INF"
      id="Fact000280"
      unitRef="Ratio">0.0368</rr:AverageAnnualReturnYear05>
    <rr:AverageAnnualReturnYear10
      contextRef="From2024-04-302024-04-30_custom_S000003879Member_custom_MSCIEmergingMarketsIndexMember"
      decimals="INF"
      id="Fact000281"
      unitRef="Ratio">0.0266</rr:AverageAnnualReturnYear10>
    <rr:AverageAnnualReturnYear01
      contextRef="From2024-04-302024-04-30_custom_S000003879Member_custom_PVTEmergingMarketsEquityLinkedBenchmarkMember"
      decimals="INF"
      id="Fact000282"
      unitRef="Ratio">0.0983</rr:AverageAnnualReturnYear01>
    <rr:AverageAnnualReturnYear05
      contextRef="From2024-04-302024-04-30_custom_S000003879Member_custom_PVTEmergingMarketsEquityLinkedBenchmarkMember"
      decimals="INF"
      id="Fact000283"
      unitRef="Ratio">0.0669</rr:AverageAnnualReturnYear05>
    <rr:AverageAnnualReturnYear10
      contextRef="From2024-04-302024-04-30_custom_S000003879Member_custom_PVTEmergingMarketsEquityLinkedBenchmarkMember"
      decimals="INF"
      id="Fact000284"
      unitRef="Ratio">0.0412</rr:AverageAnnualReturnYear10>
    <rr:PerformanceTableClosingTextBlock
      contextRef="From2024-04-302024-04-30_custom_S000003879Member"
      id="Fact000285">&lt;div id="xdx_A8B_err--PerformanceTableClosingTextBlock_z2OJ6sDIpYIc"&gt;&lt;/div&gt;
&lt;table style="font: 300 9pt/1.5 Arial, Helvetica, Sans-Serif; margin-left: 10px; width: 90%"&gt;
&lt;tr style="vertical-align: top"&gt;
&lt;td style="width: 25px; text-align: right"&gt;


&lt;/td&gt;
&lt;td&gt;
The Putnam VT Emerging Markets Equity Linked Benchmark represents the performance of the MSCI EAFE Growth Index (ND) through April 29, 2020, and the performance of the MSCI Emerging Markets Index (ND) thereafter.

&lt;/td&gt;

&lt;/tr&gt;
&lt;/table&gt;

&lt;table style="font: 300 9pt/1.5 Arial, Helvetica, Sans-Serif; margin-left: 10px; width: 90%"&gt;
&lt;tr style="vertical-align: top"&gt;
&lt;td style="width: 25px; text-align: right"&gt;&lt;/td&gt;
&lt;td&gt;&lt;span style="-sec-ix-redline: true"&gt;All MSCI indices are provided by MSCI.&lt;/span&gt;&lt;/td&gt;

&lt;/tr&gt;
&lt;/table&gt;

&lt;table style="font: 300 9pt/1.5 Arial, Helvetica, Sans-Serif; margin-left: 10px; width: 90%"&gt;
&lt;tr style="vertical-align: top"&gt;
&lt;td style="width: 25px; text-align: right"&gt;&lt;/td&gt;
&lt;td&gt;&lt;span style="-sec-ix-redline: true"&gt;MSCI makes no warranties and shall have no liability with respect to any MSCI data reproduced herein. No further redistribution
or use is permitted. This report is not prepared or endorsed by MSCI. Important data provider notices and terms available at www.franklintempletondatasources.com.
You cannot invest directly in an index.&lt;/span&gt;&lt;/td&gt;

&lt;/tr&gt;
&lt;/table&gt;

</rr:PerformanceTableClosingTextBlock>
    <rr:RiskReturnHeading
      contextRef="From2024-04-302024-04-30_custom_S000003897Member"
      id="Fact000287">Fund summary</rr:RiskReturnHeading>
    <rr:ObjectiveHeading
      contextRef="From2024-04-302024-04-30_custom_S000003897Member"
      id="Fact000288">Goal</rr:ObjectiveHeading>
    <rr:ObjectivePrimaryTextBlock
      contextRef="From2024-04-302024-04-30_custom_S000003897Member"
      id="Fact000289">&lt;p id="xdx_A8A_err--ObjectivePrimaryTextBlock_zCwTBaruuDuj" style="font: 10pt/1.5 Arial, Helvetica, Sans-Serif; margin: 0px 42px 9px; color: #000000; font-weight: 300; text-align: left"&gt;
Putnam VT Focused International Equity Fund seeks capital appreciation. 
&lt;/p&gt;

</rr:ObjectivePrimaryTextBlock>
    <rr:ExpenseHeading
      contextRef="From2024-04-302024-04-30_custom_S000003897Member"
      id="Fact000290">Fees and expenses</rr:ExpenseHeading>
    <rr:ExpenseNarrativeTextBlock
      contextRef="From2024-04-302024-04-30_custom_S000003897Member"
      id="Fact000291">&lt;p id="xdx_A83_err--ExpenseNarrativeTextBlock_z0CAfp7zeqvi" style="font: 10pt/1.5 Arial, Helvetica, Sans-Serif; margin: 0px 42px 9px; color: #000000; font-weight: 300; text-align: left"&gt;
The following table describes the fees and expenses you may pay if you buy, hold and sell shares of the fund. You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in the tables and examples below. The fees and expenses information does not reflect insurance-related charges or expenses borne by contract holders indirectly investing in the fund. If it did, expenses would be higher.
&lt;/p&gt;

</rr:ExpenseNarrativeTextBlock>
    <rr:OperatingExpensesCaption
      contextRef="From2024-04-302024-04-30_custom_S000003897Member"
      id="Fact000292">
Annual fund operating expenses 



(expenses you pay each year as a percentage of the value of your investment)
</rr:OperatingExpensesCaption>
    <rr:ManagementFeesOverAssets
      contextRef="From2024-04-302024-04-30_custom_S000003897Member_custom_C000010889Member"
      decimals="INF"
      id="Fact000294"
      unitRef="Ratio">0.0069</rr:ManagementFeesOverAssets>
    <rr:DistributionAndService12b1FeesOverAssets
      contextRef="From2024-04-302024-04-30_custom_S000003897Member_custom_C000010889Member"
      decimals="INF"
      id="Fact000295"
      unitRef="Ratio">0</rr:DistributionAndService12b1FeesOverAssets>
    <rr:OtherExpensesOverAssets
      contextRef="From2024-04-302024-04-30_custom_S000003897Member_custom_C000010889Member"
      decimals="INF"
      id="Fact000296"
      unitRef="Ratio">0.0018</rr:OtherExpensesOverAssets>
    <rr:ExpensesOverAssets
      contextRef="From2024-04-302024-04-30_custom_S000003897Member_custom_C000010889Member"
      decimals="INF"
      id="Fact000297"
      unitRef="Ratio">0.0087</rr:ExpensesOverAssets>
    <rr:FeeWaiverOrReimbursementOverAssets
      contextRef="From2024-04-302024-04-30_custom_S000003897Member_custom_C000010889Member"
      decimals="INF"
      id="Fact000298"
      unitRef="Ratio">-0.0005</rr:FeeWaiverOrReimbursementOverAssets>
    <rr:NetExpensesOverAssets
      contextRef="From2024-04-302024-04-30_custom_S000003897Member_custom_C000010889Member"
      decimals="INF"
      id="Fact000299"
      unitRef="Ratio">0.0082</rr:NetExpensesOverAssets>
    <rr:ManagementFeesOverAssets
      contextRef="From2024-04-302024-04-30_custom_S000003897Member_custom_C000010890Member"
      decimals="INF"
      id="Fact000300"
      unitRef="Ratio">0.0069</rr:ManagementFeesOverAssets>
    <rr:DistributionAndService12b1FeesOverAssets
      contextRef="From2024-04-302024-04-30_custom_S000003897Member_custom_C000010890Member"
      decimals="INF"
      id="Fact000301"
      unitRef="Ratio">0.0025</rr:DistributionAndService12b1FeesOverAssets>
    <rr:OtherExpensesOverAssets
      contextRef="From2024-04-302024-04-30_custom_S000003897Member_custom_C000010890Member"
      decimals="INF"
      id="Fact000302"
      unitRef="Ratio">0.0018</rr:OtherExpensesOverAssets>
    <rr:ExpensesOverAssets
      contextRef="From2024-04-302024-04-30_custom_S000003897Member_custom_C000010890Member"
      decimals="INF"
      id="Fact000303"
      unitRef="Ratio">0.0112</rr:ExpensesOverAssets>
    <rr:FeeWaiverOrReimbursementOverAssets
      contextRef="From2024-04-302024-04-30_custom_S000003897Member_custom_C000010890Member"
      decimals="INF"
      id="Fact000304"
      unitRef="Ratio">-0.0005</rr:FeeWaiverOrReimbursementOverAssets>
    <rr:NetExpensesOverAssets
      contextRef="From2024-04-302024-04-30_custom_S000003897Member_custom_C000010890Member"
      decimals="INF"
      id="Fact000305"
      unitRef="Ratio">0.0107</rr:NetExpensesOverAssets>
    <rr:FeeWaiverOrReimbursementOverAssetsDateOfTermination
      contextRef="From2024-04-302024-04-30_custom_S000003897Member"
      id="Fact000307">4/30/25</rr:FeeWaiverOrReimbursementOverAssetsDateOfTermination>
    <rr:ExpenseExampleHeading
      contextRef="From2024-04-302024-04-30_custom_S000003897Member"
      id="Fact000308">Example</rr:ExpenseExampleHeading>
    <rr:ExpenseExampleNarrativeTextBlock
      contextRef="From2024-04-302024-04-30_custom_S000003897Member"
      id="Fact000309">&lt;p id="xdx_A89_err--ExpenseExampleNarrativeTextBlock_zDnIsgdfNoF6" style="font: 10pt/1.5 Arial, Helvetica, Sans-Serif; margin: 0px 42px 9px; color: #000000; font-weight: 300; text-align: left"&gt;
The following hypothetical example is intended to help you compare the cost of investing in the fund with the cost of investing in other funds. The example does not reflect insurance-related charges or expenses. If it did, expenses would be higher. It assumes that you invest $10,000 in the fund for the time periods indicated and then redeem or hold all your shares at the end of those periods. It assumes a 5% return on your investment each year and that the fund&#x2019;s operating expenses remain the same. Only the first year of each period in the example takes into account the expense reimbursement described above. Your actual costs may be higher or lower.
&lt;/p&gt;

</rr:ExpenseExampleNarrativeTextBlock>
    <rr:ExpenseExampleYear01
      contextRef="From2024-04-302024-04-30_custom_S000003897Member_custom_C000010889Member"
      decimals="0"
      id="Fact000311"
      unitRef="USD">84</rr:ExpenseExampleYear01>
    <rr:ExpenseExampleYear03
      contextRef="From2024-04-302024-04-30_custom_S000003897Member_custom_C000010889Member"
      decimals="0"
      id="Fact000312"
      unitRef="USD">273</rr:ExpenseExampleYear03>
    <rr:ExpenseExampleYear05
      contextRef="From2024-04-302024-04-30_custom_S000003897Member_custom_C000010889Member"
      decimals="0"
      id="Fact000313"
      unitRef="USD">477</rr:ExpenseExampleYear05>
    <rr:ExpenseExampleYear10
      contextRef="From2024-04-302024-04-30_custom_S000003897Member_custom_C000010889Member"
      decimals="0"
      id="Fact000314"
      unitRef="USD">1068</rr:ExpenseExampleYear10>
    <rr:ExpenseExampleYear01
      contextRef="From2024-04-302024-04-30_custom_S000003897Member_custom_C000010890Member"
      decimals="0"
      id="Fact000315"
      unitRef="USD">109</rr:ExpenseExampleYear01>
    <rr:ExpenseExampleYear03
      contextRef="From2024-04-302024-04-30_custom_S000003897Member_custom_C000010890Member"
      decimals="0"
      id="Fact000316"
      unitRef="USD">351</rr:ExpenseExampleYear03>
    <rr:ExpenseExampleYear05
      contextRef="From2024-04-302024-04-30_custom_S000003897Member_custom_C000010890Member"
      decimals="0"
      id="Fact000317"
      unitRef="USD">612</rr:ExpenseExampleYear05>
    <rr:ExpenseExampleYear10
      contextRef="From2024-04-302024-04-30_custom_S000003897Member_custom_C000010890Member"
      decimals="0"
      id="Fact000318"
      unitRef="USD">1359</rr:ExpenseExampleYear10>
    <rr:PortfolioTurnoverHeading
      contextRef="From2024-04-302024-04-30_custom_S000003897Member"
      id="Fact000319">Portfolio turnover</rr:PortfolioTurnoverHeading>
    <rr:PortfolioTurnoverTextBlock
      contextRef="From2024-04-302024-04-30_custom_S000003897Member"
      id="Fact000320">&lt;p id="xdx_A88_err--PortfolioTurnoverTextBlock_zQUT0Rv6LjYh" style="font: 10pt/1.5 Arial, Helvetica, Sans-Serif; margin: 0px 42px 9px; color: #000000; font-weight: 300; text-align: left"&gt;&lt;span style="-sec-ix-redline: true"&gt;The
fund pays transaction-related costs, such as commissions, when it buys and sells securities (or &#x201c;turns over&#x201d; its portfolio).
A higher turnover rate may indicate higher transaction costs. These costs, which are not reflected in annual fund operating expenses
or the above example, affect fund performance. The fund&#x2019;s turnover rate in the most recent fiscal year was &lt;span id="xdx_902_err--PortfolioTurnoverRate_dU_c20240430__20240430__dei--LegalEntityAxis__custom--S000003897Member_zAjvgSPE9mm1"&gt;17%&lt;/span&gt;.&lt;/span&gt;&lt;/p&gt;

</rr:PortfolioTurnoverTextBlock>
    <rr:PortfolioTurnoverRate
      contextRef="From2024-04-302024-04-30_custom_S000003897Member"
      decimals="INF"
      id="Fact000321"
      unitRef="Ratio">0.17</rr:PortfolioTurnoverRate>
    <rr:StrategyHeading
      contextRef="From2024-04-302024-04-30_custom_S000003897Member"
      id="Fact000322">Investments, risks, and performance</rr:StrategyHeading>
    <rr:StrategyNarrativeTextBlock
      contextRef="From2024-04-302024-04-30_custom_S000003897Member"
      id="Fact000323">&lt;p id="xdx_A89_err--StrategyNarrativeTextBlock_z5G0otntW4j6" style="font: 600 10pt/1.5 Arial, Helvetica, Sans-Serif; margin: 15px 42px 0px; color: #000000"&gt;
&lt;b&gt;Investments&lt;/b&gt;
&lt;/p&gt;

&lt;p style="font: 10pt/1.5 Arial, Helvetica, Sans-Serif; margin: 0px 42px 9px; color: #000000; font-weight: 300; text-align: left"&gt;&lt;span style="-sec-ix-redline: true"&gt;We
invest mainly in common stocks (growth or value stocks or both) of companies of any size outside the United States that we believe have
favorable investment potential. We consider a company to be located outside the United States if the company&#x2019;s securities trade
outside the United States, the company is headquartered or organized outside the United States or the company derives a majority of its
revenues or profits outside the United States. Under normal circumstances, we invest at least 80% of the fund&#x2019;s net&#160;assets
in equity investments. This policy may be changed only after 60 days&#x2019; notice to shareholders. The fund&#x2019;s equity investments
may include common stocks, preferred stocks, convertible securities, warrants, American Depositary Receipts (ADRs) and Global Depositary
Receipts (GDRs). We invest in both developed countries and in emerging markets.&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt/1.5 Arial, Helvetica, Sans-Serif; margin: 0px 42px 9px; color: #000000; font-weight: 300; text-align: left"&gt;
We may consider, among other factors, a company&#x2019;s valuation, financial strength, growth potential, competitive position in its industry, projected future earnings, cash flows and dividends when deciding whether to buy or sell investments. We may also consider other factors that we believe will cause the stock price to rise. We may also use derivatives, such as futures, options, warrants and swap contracts, for both hedging and non-hedging&#160;purposes.
&lt;/p&gt;

&lt;p style="font: 10pt/1.5 Arial, Helvetica, Sans-Serif; margin: 0px 42px 9px; color: #000000; font-weight: 300; text-align: left"&gt;
The fund is &#x201c;non-diversified,&#x201d; which means it may invest a greater percentage of its assets in fewer issuers than a &#x201c;diversified&#x201d; fund. The fund expects to invest in a limited number of issuers.
&lt;/p&gt;

</rr:StrategyNarrativeTextBlock>
    <rr:RiskHeading
      contextRef="From2024-04-302024-04-30_custom_S000003897Member"
      id="Fact000324">Risks</rr:RiskHeading>
    <rr:RiskTextBlock
      contextRef="From2024-04-302024-04-30_custom_S000003897Member"
      id="Fact000325">&lt;p id="xdx_A85_err--RiskTextBlock_ziPIo7G8s2Mb" style="font: 10pt/1.5 Arial, Helvetica, Sans-Serif; margin: 0px 42px 9px; color: #000000; font-weight: 300; text-align: left"&gt;
&lt;span id="xdx_90C_err--RiskTextBlock_dU_c20240430__20240430__dei--LegalEntityAxis__custom--S000003897Member__rr--RiskAxis__rr--RiskLoseMoneyMember_z60ApwfhbLlb"&gt;It is important to understand that you can lose money by investing in the fund.&lt;/span&gt;
&lt;/p&gt;

&lt;p style="font: 10pt/1.5 Arial, Helvetica, Sans-Serif; margin: 0px 42px 9px; color: #000000; font-weight: 300; text-align: left"&gt;
The value of investments in the fund&#x2019;s portfolio may fall or fail to rise over extended periods of time for a variety of reasons, including general economic, political or financial market conditions, investor sentiment and market perceptions, government actions, geopolitical events or changes, outbreaks of infectious illnesses or other widespread public health issues, and factors related to a specific issuer, geography, industry or sector. These and other factors may lead to increased volatility and reduced liquidity in the fund&#x2019;s portfolio holdings, may negatively impact the fund&#x2019;s performance, and may exacerbate other risks to which the fund is subject. The fund will be more susceptible to these risks than other funds because it invests in a limited number of issuers, industries or sectors, and the fund may perform poorly as a result of adverse developments affecting those issuers, industries or sectors.
&lt;/p&gt;

&lt;p style="font: 10pt/1.5 Arial, Helvetica, Sans-Serif; margin: 0px 42px 9px; color: #000000; font-weight: 300; text-align: left"&gt;
The value of international investments traded in foreign currencies may be adversely impacted by fluctuations in exchange rates. International investments, particularly investments in emerging markets, may carry risks associated with potentially less stable economies or governments (such as the risk of seizure by a foreign government, the imposition of currency or other restrictions, or high levels of inflation), and may be or become illiquid.
&lt;/p&gt;



&lt;p&gt;
&lt;br/&gt;
&lt;br/&gt;
&lt;/p&gt;

&lt;div style="border-top: Black 1pt solid; margin: 18pt auto; font-size: 1pt"&gt;&#160;&lt;/div&gt;

&lt;p&gt;&lt;br/&gt;
&lt;br/&gt;
&lt;/p&gt;

&lt;p style="font: 10pt/1.5 Arial, Helvetica, Sans-Serif; margin: 0px 42px 9px; color: #000000; font-weight: 300; text-align: left"&gt;
Investments focused in a single region may be affected by common economic forces and other factors. In addition, events in any one country within the region may impact the other countries or the region as a whole. Because the fund currently invests, and may in the future invest, significantly in European and Asian companies, the fund is particularly susceptible to economic, political, regulatory and other events or conditions affecting issuers in Europe and Asia. European financial markets have in recent years experienced increased volatility due to concerns with some countries&#x2019; high levels of sovereign debt, budget deficits, and unemployment. Asia includes countries in various stages of economic development, from emerging market economies to the highly developed economy of Japan. Some parts of Asia may be subject to a greater degree of economic, political and social instability than is the case in the United States.
&lt;/p&gt;

&lt;p style="font: 10pt/1.5 Arial, Helvetica, Sans-Serif; margin: 0px 42px 9px; color: #000000; font-weight: 300; text-align: left"&gt;
&lt;span id="xdx_90B_err--RiskTextBlock_dU_c20240430__20240430__dei--LegalEntityAxis__custom--S000003897Member__rr--RiskAxis__rr--RiskNondiversifiedStatusMember_zGIGdje8Mcvg"&gt;As a non-diversified fund, the fund invests in fewer issuers and is more vulnerable than a more broadly diversified fund to fluctuations in the values of the securities it holds.&lt;/span&gt;
&lt;/p&gt;

&lt;p style="font: 10pt/1.5 Arial, Helvetica, Sans-Serif; margin: 0px 42px 9px; color: #000000; font-weight: 300; text-align: left"&gt;
Our use of derivatives may increase the risks of investing in the fund by increasing investment exposure (which may be considered leverage) or, in the case of many over-the-counter instruments, because of the potential inability to terminate or sell derivative positions and the potential failure of the other party to the instrument to meet its obligations. The risk of a party failing to meet its obligations may increase if the fund has significant exposure to that counterparty. The value of derivatives may move in unexpected ways due to unanticipated market movements, the use of leverage, imperfect correlation between the derivative instrument and the reference asset or other factors, especially in unusual market conditions, and volatility in the value of derivatives could adversely impact the fund&#x2019;s returns, obligations and exposures. Derivatives are also subject to other risks, including liquidity risk (e.g., liquidity demands arising from the requirement to make payments to a derivative counterparty), operational risk (e.g., settlement issues or system failures), and legal risk (e.g., insufficient legal documentation or contract enforceability issues).
&lt;/p&gt;

&lt;p style="font: 10pt/1.5 Arial, Helvetica, Sans-Serif; margin: 0px 42px 9px; color: #000000; font-weight: 300; text-align: left"&gt;
There is no guarantee that the investment techniques, analyses, or judgments that we apply in making investment decisions for the fund will produce the intended outcome or that the investments we select for the fund will perform as well as other securities that were not selected for the fund. We, or the fund&#x2019;s other service providers, may experience disruptions or operating errors that could negatively impact the fund. 
&lt;/p&gt;

&lt;p style="font: 10pt/1.5 Arial, Helvetica, Sans-Serif; margin: 0px 42px 9px; color: #000000; font-weight: 300; text-align: left"&gt;&lt;span style="-sec-ix-redline: true"&gt;The
fund may be an investment option for mutual funds that are managed by Franklin Resources, Inc. (Franklin Templeton) and its affiliates
as &#x201c;funds of funds&#x201d; and other investors with substantial investments in the fund. Such shareholders may at times be considered
to control the fund. Dispositions of a large number of shares by these shareholders may adversely affect the fund&#x2019;s liquidity and
net&#160;assets. These redemptions may also force the fund to sell securities, which may increase the fund&#x2019;s brokerage costs.&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt/1.5 Arial, Helvetica, Sans-Serif; margin: 0px 42px 9px; color: #000000; font-weight: 300; text-align: left"&gt;
The fund may not achieve its goal, and it is not intended to be a complete investment program. &lt;span id="xdx_906_err--RiskTextBlock_dU_c20240430__20240430__dei--LegalEntityAxis__custom--S000003897Member__rr--RiskAxis__rr--RiskNotInsuredDepositoryInstitutionMember_zQDOTiNpOW0k"&gt;An investment in the fund is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency.&lt;/span&gt;
&lt;/p&gt;

</rr:RiskTextBlock>
    <rr:RiskTextBlock
      contextRef="From2024-04-302024-04-30_custom_S000003897Member_rr_RiskLoseMoneyMember"
      id="Fact000326">It is important to understand that you can lose money by investing in the fund.</rr:RiskTextBlock>
    <rr:RiskTextBlock
      contextRef="From2024-04-302024-04-30_custom_S000003897Member_rr_RiskNondiversifiedStatusMember"
      id="Fact000328">As a non-diversified fund, the fund invests in fewer issuers and is more vulnerable than a more broadly diversified fund to fluctuations in the values of the securities it holds.</rr:RiskTextBlock>
    <rr:RiskTextBlock
      contextRef="From2024-04-302024-04-30_custom_S000003897Member_rr_RiskNotInsuredDepositoryInstitutionMember"
      id="Fact000329">An investment in the fund is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency.</rr:RiskTextBlock>
    <rr:BarChartAndPerformanceTableHeading
      contextRef="From2024-04-302024-04-30_custom_S000003897Member"
      id="Fact000330">Performance</rr:BarChartAndPerformanceTableHeading>
    <rr:PerformanceNarrativeTextBlock
      contextRef="From2024-04-302024-04-30_custom_S000003897Member"
      id="Fact000331">&lt;p id="xdx_A84_err--PerformanceNarrativeTextBlock_za4ogpYjijg9" style="font: 10pt/1.5 Arial, Helvetica, Sans-Serif; margin: 0px 42px 9px; color: #000000; font-weight: 300; text-align: left"&gt;
&lt;span id="xdx_906_err--PerformanceInformationIllustratesVariabilityOfReturns_dU_c20240430__20240430__dei--LegalEntityAxis__custom--S000003897Member_z6Gs2d7ivVTg"&gt;The performance information below gives some indication of the risks associated with an investment in the fund by showing the fund&#x2019;s performance year to year and over time.&lt;/span&gt; Before April&#160;30, 2021, the fund was managed with a materially different investment strategy and may have achieved materially different performance results under its current investment strategy from that shown for periods before this date. The performance information does not reflect insurance-related charges or expenses. If it did, performance would be lower. &lt;span id="xdx_906_err--PerformancePastDoesNotIndicateFuture_dU_c20240430__20240430__dei--LegalEntityAxis__custom--S000003897Member_ziiGEk49AXsj"&gt;Please remember that past performance is not necessarily an indication of future results.&lt;/span&gt; 
&lt;/p&gt;

</rr:PerformanceNarrativeTextBlock>
    <rr:PerformanceInformationIllustratesVariabilityOfReturns
      contextRef="From2024-04-302024-04-30_custom_S000003897Member"
      id="Fact000332">The performance information below gives some indication of the risks associated with an investment in the fund by showing the fund&#x2019;s performance year to year and over time.</rr:PerformanceInformationIllustratesVariabilityOfReturns>
    <rr:PerformancePastDoesNotIndicateFuture
      contextRef="From2024-04-302024-04-30_custom_S000003897Member"
      id="Fact000333">Please remember that past performance is not necessarily an indication of future results.</rr:PerformancePastDoesNotIndicateFuture>
    <rr:BarChartHeading
      contextRef="From2024-04-302024-04-30_custom_S000003897Member"
      id="Fact000334">Annual total returns for class IA shares</rr:BarChartHeading>
    <rr:AnnualReturn2014
      contextRef="From2024-04-302024-04-30_custom_S000003897Member_custom_C000010889Member"
      decimals="INF"
      id="Fact000337"
      unitRef="Ratio">0.0177</rr:AnnualReturn2014>
    <rr:AnnualReturn2015
      contextRef="From2024-04-302024-04-30_custom_S000003897Member_custom_C000010889Member"
      decimals="INF"
      id="Fact000339"
      unitRef="Ratio">-0.0149</rr:AnnualReturn2015>
    <rr:AnnualReturn2016
      contextRef="From2024-04-302024-04-30_custom_S000003897Member_custom_C000010889Member"
      decimals="INF"
      id="Fact000341"
      unitRef="Ratio">0.0137</rr:AnnualReturn2016>
    <rr:AnnualReturn2017
      contextRef="From2024-04-302024-04-30_custom_S000003897Member_custom_C000010889Member"
      decimals="INF"
      id="Fact000343"
      unitRef="Ratio">0.2871</rr:AnnualReturn2017>
    <rr:AnnualReturn2018
      contextRef="From2024-04-302024-04-30_custom_S000003897Member_custom_C000010889Member"
      decimals="INF"
      id="Fact000345"
      unitRef="Ratio">-0.1221</rr:AnnualReturn2018>
    <rr:AnnualReturn2019
      contextRef="From2024-04-302024-04-30_custom_S000003897Member_custom_C000010889Member"
      decimals="INF"
      id="Fact000347"
      unitRef="Ratio">0.2692</rr:AnnualReturn2019>
    <rr:AnnualReturn2020
      contextRef="From2024-04-302024-04-30_custom_S000003897Member_custom_C000010889Member"
      decimals="INF"
      id="Fact000349"
      unitRef="Ratio">0.1032</rr:AnnualReturn2020>
    <rr:AnnualReturn2021
      contextRef="From2024-04-302024-04-30_custom_S000003897Member_custom_C000010889Member"
      decimals="INF"
      id="Fact000351"
      unitRef="Ratio">0.1284</rr:AnnualReturn2021>
    <rr:AnnualReturn2022
      contextRef="From2024-04-302024-04-30_custom_S000003897Member_custom_C000010889Member"
      decimals="INF"
      id="Fact000353"
      unitRef="Ratio">-0.1799</rr:AnnualReturn2022>
    <rr:AnnualReturn2023
      contextRef="From2024-04-302024-04-30_custom_S000003897Member_custom_C000010889Member"
      decimals="INF"
      id="Fact000355"
      unitRef="Ratio">0.1956</rr:AnnualReturn2023>
    <rr:YearToDateReturnLabel
      contextRef="From2024-04-302024-04-30_custom_S000003897Member"
      id="Fact000356">Year-to-date performance
through</rr:YearToDateReturnLabel>
    <rr:BarChartYearToDateReturnDate
      contextRef="From2024-04-302024-04-30_custom_S000003897Member"
      id="Fact000357">2024-03-31</rr:BarChartYearToDateReturnDate>
    <rr:BarChartYearToDateReturn
      contextRef="From2024-04-302024-04-30_custom_S000003897Member"
      decimals="INF"
      id="Fact000358"
      unitRef="Ratio">0.0321</rr:BarChartYearToDateReturn>
    <rr:HighestQuarterlyReturnLabel
      contextRef="From2024-04-302024-04-30_custom_S000003897Member"
      id="Fact000359">Best calendar quarter</rr:HighestQuarterlyReturnLabel>
    <rr:BarChartHighestQuarterlyReturnDate
      contextRef="From2024-04-302024-04-30_custom_S000003897Member"
      id="Fact000360">2020-06-30</rr:BarChartHighestQuarterlyReturnDate>
    <rr:BarChartHighestQuarterlyReturn
      contextRef="From2024-04-302024-04-30_custom_S000003897Member"
      decimals="INF"
      id="Fact000361"
      unitRef="Ratio">0.2273</rr:BarChartHighestQuarterlyReturn>
    <rr:LowestQuarterlyReturnLabel
      contextRef="From2024-04-302024-04-30_custom_S000003897Member"
      id="Fact000362">Worst calendar quarter</rr:LowestQuarterlyReturnLabel>
    <rr:BarChartLowestQuarterlyReturnDate
      contextRef="From2024-04-302024-04-30_custom_S000003897Member"
      id="Fact000363">2020-03-31</rr:BarChartLowestQuarterlyReturnDate>
    <rr:BarChartLowestQuarterlyReturn
      contextRef="From2024-04-302024-04-30_custom_S000003897Member"
      decimals="INF"
      id="Fact000364"
      unitRef="Ratio">-0.2451</rr:BarChartLowestQuarterlyReturn>
    <rr:PerformanceTableHeading
      contextRef="From2024-04-302024-04-30_custom_S000003897Member"
      id="Fact000365">Average
annual total returns

(for
periods ended 12/31/23)</rr:PerformanceTableHeading>
    <rr:AverageAnnualReturnYear01
      contextRef="From2024-04-302024-04-30_custom_S000003897Member_custom_C000010889Member"
      decimals="INF"
      id="Fact000367"
      unitRef="Ratio">0.1956</rr:AverageAnnualReturnYear01>
    <rr:AverageAnnualReturnYear05
      contextRef="From2024-04-302024-04-30_custom_S000003897Member_custom_C000010889Member"
      decimals="INF"
      id="Fact000368"
      unitRef="Ratio">0.0915</rr:AverageAnnualReturnYear05>
    <rr:AverageAnnualReturnYear10
      contextRef="From2024-04-302024-04-30_custom_S000003897Member_custom_C000010889Member"
      decimals="INF"
      id="Fact000369"
      unitRef="Ratio">0.0593</rr:AverageAnnualReturnYear10>
    <rr:AverageAnnualReturnYear01
      contextRef="From2024-04-302024-04-30_custom_S000003897Member_custom_C000010890Member"
      decimals="INF"
      id="Fact000370"
      unitRef="Ratio">0.1925</rr:AverageAnnualReturnYear01>
    <rr:AverageAnnualReturnYear05
      contextRef="From2024-04-302024-04-30_custom_S000003897Member_custom_C000010890Member"
      decimals="INF"
      id="Fact000371"
      unitRef="Ratio">0.0888</rr:AverageAnnualReturnYear05>
    <rr:AverageAnnualReturnYear10
      contextRef="From2024-04-302024-04-30_custom_S000003897Member_custom_C000010890Member"
      decimals="INF"
      id="Fact000372"
      unitRef="Ratio">0.0566</rr:AverageAnnualReturnYear10>
    <rr:AverageAnnualReturnYear01
      contextRef="From2024-04-302024-04-30_custom_S000003897Member_custom_MSCIACWIexUSAIndexMember"
      decimals="INF"
      id="Fact000373"
      unitRef="Ratio">0.1562</rr:AverageAnnualReturnYear01>
    <rr:AverageAnnualReturnYear05
      contextRef="From2024-04-302024-04-30_custom_S000003897Member_custom_MSCIACWIexUSAIndexMember"
      decimals="INF"
      id="Fact000374"
      unitRef="Ratio">0.0708</rr:AverageAnnualReturnYear05>
    <rr:AverageAnnualReturnYear10
      contextRef="From2024-04-302024-04-30_custom_S000003897Member_custom_MSCIACWIexUSAIndexMember"
      decimals="INF"
      id="Fact000375"
      unitRef="Ratio">0.0383</rr:AverageAnnualReturnYear10>
    <rr:AverageAnnualReturnYear01
      contextRef="From2024-04-302024-04-30_custom_S000003897Member_custom_PVTFocusedInternationalEquityLinkedBenchmarkMember"
      decimals="INF"
      id="Fact000376"
      unitRef="Ratio">0.1562</rr:AverageAnnualReturnYear01>
    <rr:AverageAnnualReturnYear05
      contextRef="From2024-04-302024-04-30_custom_S000003897Member_custom_PVTFocusedInternationalEquityLinkedBenchmarkMember"
      decimals="INF"
      id="Fact000377"
      unitRef="Ratio">0.0976</rr:AverageAnnualReturnYear05>
    <rr:AverageAnnualReturnYear10
      contextRef="From2024-04-302024-04-30_custom_S000003897Member_custom_PVTFocusedInternationalEquityLinkedBenchmarkMember"
      decimals="INF"
      id="Fact000378"
      unitRef="Ratio">0.0713</rr:AverageAnnualReturnYear10>
    <rr:PerformanceTableClosingTextBlock
      contextRef="From2024-04-302024-04-30_custom_S000003897Member"
      id="Fact000379">&lt;div id="xdx_A84_err--PerformanceTableClosingTextBlock_zfHsmEIOGCD"&gt;&lt;/div&gt;
&lt;table style="font: 300 9pt/1.5 Arial, Helvetica, Sans-Serif; margin-left: 10px; width: 90%"&gt;
&lt;tr style="vertical-align: top"&gt;
&lt;td style="width: 25px; text-align: right"&gt;&lt;/td&gt;
&lt;td&gt;The Putnam VT Focused International Equity Linked Benchmark represents the performance of the MSCI World Index (ND) through April
29, 2021, and the performance of the MSCI ACWI ex USA Index (ND) thereafter.&lt;/td&gt;

&lt;/tr&gt;
&lt;/table&gt;

&lt;table style="font: 300 9pt/1.5 Arial, Helvetica, Sans-Serif; margin-left: 10px; width: 90%"&gt;
&lt;tr style="vertical-align: top"&gt;
&lt;td style="width: 25px; text-align: right"&gt;&lt;/td&gt;
&lt;td&gt;&lt;span style="-sec-ix-redline: true"&gt;All MSCI indices are provided by MSCI.&lt;/span&gt;&lt;/td&gt;

&lt;/tr&gt;
&lt;/table&gt;

&lt;table style="font: 300 9pt/1.5 Arial, Helvetica, Sans-Serif; margin-left: 10px; width: 90%"&gt;
&lt;tr style="vertical-align: top"&gt;
&lt;td style="width: 25px; text-align: right"&gt;&lt;/td&gt;
&lt;td&gt;&lt;span style="-sec-ix-redline: true"&gt;MSCI makes no warranties and shall have no liability with respect to any MSCI data reproduced herein. No further redistribution
or use is permitted. This report is not prepared or endorsed by MSCI. Important data provider notices and terms available at www.franklintempletondatasources.com.
You cannot invest directly in an index.&lt;/span&gt;&lt;/td&gt;

&lt;/tr&gt;
&lt;/table&gt;

</rr:PerformanceTableClosingTextBlock>
    <rr:RiskReturnHeading
      contextRef="From2024-04-302024-04-30_custom_S000003895Member"
      id="Fact000381">Fund summary</rr:RiskReturnHeading>
    <rr:ObjectiveHeading
      contextRef="From2024-04-302024-04-30_custom_S000003895Member"
      id="Fact000382">Goal</rr:ObjectiveHeading>
    <rr:ObjectivePrimaryTextBlock
      contextRef="From2024-04-302024-04-30_custom_S000003895Member"
      id="Fact000383">&lt;p id="xdx_A8B_err--ObjectivePrimaryTextBlock_zzB9YrSLc9Wg" style="font: 10pt/1.5 Arial, Helvetica, Sans-Serif; margin: 0px 42px 9px; color: #000000; font-weight: 300; text-align: left"&gt;
Putnam VT George Putnam Balanced Fund seeks to provide a balanced investment composed of a well-diversified portfolio of stocks and bonds which produce both capital growth and current income.
&lt;/p&gt;

</rr:ObjectivePrimaryTextBlock>
    <rr:ExpenseHeading
      contextRef="From2024-04-302024-04-30_custom_S000003895Member"
      id="Fact000384">Fees and expenses</rr:ExpenseHeading>
    <rr:ExpenseNarrativeTextBlock
      contextRef="From2024-04-302024-04-30_custom_S000003895Member"
      id="Fact000385">&lt;p id="xdx_A86_err--ExpenseNarrativeTextBlock_zYxRSjBAdn54" style="font: 10pt/1.5 Arial, Helvetica, Sans-Serif; margin: 0px 42px 9px; color: #000000; font-weight: 300; text-align: left"&gt;
The following table describes the fees and expenses you may pay if you buy, hold and sell shares of the fund. You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in the tables and examples below. The fees and expenses information does not reflect insurance-related charges or expenses borne by contract holders indirectly investing in the fund. If it did, expenses would be higher.
&lt;/p&gt;

</rr:ExpenseNarrativeTextBlock>
    <rr:OperatingExpensesCaption
      contextRef="From2024-04-302024-04-30_custom_S000003895Member"
      id="Fact000386">
Annual fund operating expenses



(expenses you pay each year as a percentage of the value of your investment)
</rr:OperatingExpensesCaption>
    <rr:ManagementFeesOverAssets
      contextRef="From2024-04-302024-04-30_custom_S000003895Member_custom_C000010885Member"
      decimals="INF"
      id="Fact000388"
      unitRef="Ratio">0.0052</rr:ManagementFeesOverAssets>
    <rr:DistributionAndService12b1FeesOverAssets
      contextRef="From2024-04-302024-04-30_custom_S000003895Member_custom_C000010885Member"
      decimals="INF"
      id="Fact000389"
      unitRef="Ratio">0</rr:DistributionAndService12b1FeesOverAssets>
    <rr:OtherExpensesOverAssets
      contextRef="From2024-04-302024-04-30_custom_S000003895Member_custom_C000010885Member"
      decimals="INF"
      id="Fact000390"
      unitRef="Ratio">0.0015</rr:OtherExpensesOverAssets>
    <rr:ExpensesOverAssets
      contextRef="From2024-04-302024-04-30_custom_S000003895Member_custom_C000010885Member"
      decimals="INF"
      id="Fact000391"
      unitRef="Ratio">0.0067</rr:ExpensesOverAssets>
    <rr:ManagementFeesOverAssets
      contextRef="From2024-04-302024-04-30_custom_S000003895Member_custom_C000010886Member"
      decimals="INF"
      id="Fact000392"
      unitRef="Ratio">0.0052</rr:ManagementFeesOverAssets>
    <rr:DistributionAndService12b1FeesOverAssets
      contextRef="From2024-04-302024-04-30_custom_S000003895Member_custom_C000010886Member"
      decimals="INF"
      id="Fact000393"
      unitRef="Ratio">0.0025</rr:DistributionAndService12b1FeesOverAssets>
    <rr:OtherExpensesOverAssets
      contextRef="From2024-04-302024-04-30_custom_S000003895Member_custom_C000010886Member"
      decimals="INF"
      id="Fact000394"
      unitRef="Ratio">0.0015</rr:OtherExpensesOverAssets>
    <rr:ExpensesOverAssets
      contextRef="From2024-04-302024-04-30_custom_S000003895Member_custom_C000010886Member"
      decimals="INF"
      id="Fact000395"
      unitRef="Ratio">0.0092</rr:ExpensesOverAssets>
    <rr:ExpenseExampleHeading
      contextRef="From2024-04-302024-04-30_custom_S000003895Member"
      id="Fact000396">Example</rr:ExpenseExampleHeading>
    <rr:ExpenseExampleNarrativeTextBlock
      contextRef="From2024-04-302024-04-30_custom_S000003895Member"
      id="Fact000397">&lt;p id="xdx_A86_err--ExpenseExampleNarrativeTextBlock_zKYPheqHyKij" style="font: 10pt/1.5 Arial, Helvetica, Sans-Serif; margin: 0px 42px 9px; color: #000000; font-weight: 300; text-align: left"&gt;
The following hypothetical example is intended to help you compare the cost of investing in the fund with the cost of investing in other funds. The example does not reflect insurance-related charges or expenses. If it did, expenses would be higher. It assumes that you invest $10,000 in the fund for the time periods indicated and then redeem or hold all your shares at the end of those periods. It assumes a 5% return on your investment each year and that the fund&#x2019;s operating expenses remain the same. Your actual costs may be higher or lower.
&lt;/p&gt;

</rr:ExpenseExampleNarrativeTextBlock>
    <rr:ExpenseExampleYear01
      contextRef="From2024-04-302024-04-30_custom_S000003895Member_custom_C000010885Member"
      decimals="0"
      id="Fact000399"
      unitRef="USD">68</rr:ExpenseExampleYear01>
    <rr:ExpenseExampleYear03
      contextRef="From2024-04-302024-04-30_custom_S000003895Member_custom_C000010885Member"
      decimals="0"
      id="Fact000400"
      unitRef="USD">214</rr:ExpenseExampleYear03>
    <rr:ExpenseExampleYear05
      contextRef="From2024-04-302024-04-30_custom_S000003895Member_custom_C000010885Member"
      decimals="0"
      id="Fact000401"
      unitRef="USD">373</rr:ExpenseExampleYear05>
    <rr:ExpenseExampleYear10
      contextRef="From2024-04-302024-04-30_custom_S000003895Member_custom_C000010885Member"
      decimals="0"
      id="Fact000402"
      unitRef="USD">835</rr:ExpenseExampleYear10>
    <rr:ExpenseExampleYear01
      contextRef="From2024-04-302024-04-30_custom_S000003895Member_custom_C000010886Member"
      decimals="0"
      id="Fact000403"
      unitRef="USD">94</rr:ExpenseExampleYear01>
    <rr:ExpenseExampleYear03
      contextRef="From2024-04-302024-04-30_custom_S000003895Member_custom_C000010886Member"
      decimals="0"
      id="Fact000404"
      unitRef="USD">293</rr:ExpenseExampleYear03>
    <rr:ExpenseExampleYear05
      contextRef="From2024-04-302024-04-30_custom_S000003895Member_custom_C000010886Member"
      decimals="0"
      id="Fact000405"
      unitRef="USD">509</rr:ExpenseExampleYear05>
    <rr:ExpenseExampleYear10
      contextRef="From2024-04-302024-04-30_custom_S000003895Member_custom_C000010886Member"
      decimals="0"
      id="Fact000406"
      unitRef="USD">1131</rr:ExpenseExampleYear10>
    <rr:PortfolioTurnoverHeading
      contextRef="From2024-04-302024-04-30_custom_S000003895Member"
      id="Fact000407">Portfolio turnover</rr:PortfolioTurnoverHeading>
    <rr:PortfolioTurnoverTextBlock
      contextRef="From2024-04-302024-04-30_custom_S000003895Member"
      id="Fact000408">&lt;p id="xdx_A8B_err--PortfolioTurnoverTextBlock_zqm0vai3JK13" style="font: 10pt/1.5 Arial, Helvetica, Sans-Serif; margin: 0px 42px 9px; color: #000000; font-weight: 300; text-align: left"&gt;&lt;span style="-sec-ix-redline: true"&gt;The
fund pays transaction-related costs, such as commissions, when it buys and sells securities (or &#x201c;turns over&#x201d; its portfolio).
A higher turnover rate may indicate higher transaction costs. These costs, which are not reflected in annual fund operating expenses
or the above example, affect fund performance. The fund&#x2019;s turnover rate in the most recent fiscal year was &lt;span id="xdx_904_err--PortfolioTurnoverRate_dU_c20240430__20240430__dei--LegalEntityAxis__custom--S000003895Member_zjd1ssiNFHGl"&gt;47%&lt;/span&gt;.&lt;/span&gt;&lt;/p&gt;

</rr:PortfolioTurnoverTextBlock>
    <rr:PortfolioTurnoverRate
      contextRef="From2024-04-302024-04-30_custom_S000003895Member"
      decimals="INF"
      id="Fact000409"
      unitRef="Ratio">0.47</rr:PortfolioTurnoverRate>
    <rr:StrategyHeading
      contextRef="From2024-04-302024-04-30_custom_S000003895Member"
      id="Fact000410">Investments, risks, and performance</rr:StrategyHeading>
    <rr:StrategyNarrativeTextBlock
      contextRef="From2024-04-302024-04-30_custom_S000003895Member"
      id="Fact000411">&lt;p id="xdx_A8F_err--StrategyNarrativeTextBlock_zYdHxcZ8gRrj" style="font: 600 10pt/1.5 Arial, Helvetica, Sans-Serif; margin: 15px 42px 0px; color: #000000"&gt;
&lt;b&gt;Investments&lt;/b&gt;
&lt;/p&gt;

&lt;p style="font: 10pt/1.5 Arial, Helvetica, Sans-Serif; margin: 0px 42px 9px; color: #000000; font-weight: 300; text-align: left"&gt;
We invest mainly in a combination of bonds and common stocks (growth or value stocks or both) of large U.S. companies, with a greater focus on common stocks. For example, we may purchase stocks of companies with stock prices that reflect a value lower than that which we place on the company. We may also consider other factors that we believe will cause the stock price to rise. We buy bonds of governments and private companies that are mostly investment-grade in quality with intermediate- to long-term maturities (three years or longer). We may consider, among other factors, a company's valuation, financial strength, growth potential, competitive position in its industry, projected future earnings, cash flows and dividends when deciding whether to buy or sell equity investments, and, among other factors, credit, interest rate and prepayment risks, as well as general market conditions, when deciding whether to buy or sell fixed-income investments. We may also use derivatives, such as futures, options, warrants and swap contracts, for both hedging and non-hedging purposes.
&lt;/p&gt;

</rr:StrategyNarrativeTextBlock>
    <rr:RiskHeading
      contextRef="From2024-04-302024-04-30_custom_S000003895Member"
      id="Fact000412">Risks</rr:RiskHeading>
    <rr:RiskTextBlock
      contextRef="From2024-04-302024-04-30_custom_S000003895Member"
      id="Fact000413">&lt;p id="xdx_A8E_err--RiskTextBlock_zKXOdjAE3Zl" style="font: 10pt/1.5 Arial, Helvetica, Sans-Serif; margin: 0px 42px 9px; color: #000000; font-weight: 300; text-align: left"&gt;
&lt;span id="xdx_908_err--RiskTextBlock_dU_c20240430__20240430__dei--LegalEntityAxis__custom--S000003895Member__rr--RiskAxis__rr--RiskLoseMoneyMember_zEyO1dIZ39P4"&gt;It is important to understand that you can lose money by investing in the fund.&lt;/span&gt; 
&lt;/p&gt;

&lt;p style="font: 10pt/1.5 Arial, Helvetica, Sans-Serif; margin: 0px 42px 9px; color: #000000; font-weight: 300; text-align: left"&gt;&lt;span style="-sec-ix-redline: true"&gt;The
value of investments in the fund&#x2019;s portfolio may fall or fail to rise over extended periods of time for a variety of reasons, including
general economic, political or financial market conditions, investor sentiment and market perceptions, government actions, geopolitical
events or changes, outbreaks of infectious illnesses or other widespread public health issues, and factors related to a specific issuer,
geography, industry or sector. These and other factors may lead to increased volatility and reduced liquidity in the fund&#x2019;s portfolio
holdings, may negatively impact the fund&#x2019;s performance, and may exacerbate other risks to which the fund is subject. Growth stocks
may be more susceptible to earnings disappointments, and value stocks may fail to rebound.&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt/1.5 Arial, Helvetica, Sans-Serif; margin: 0px 42px 9px; color: #000000; font-weight: 300; text-align: left"&gt;&lt;span style="-sec-ix-redline: true"&gt;Bond
investments are subject to interest rate risk, which is the risk that the value of the fund&#x2019;s bond investments is likely to fall
if interest rates rise. Bond investments also are subject to credit risk, which is the risk that the issuer of the bond may default on
payment of interest or principal. Bond investments may be more susceptible to downgrades or defaults during economic downturns or other
periods of economic stress. Interest rate risk is generally greater for longer-term bonds, and credit risk is generally greater for below-investment-grade
bonds (sometimes referred to as "junk bonds"), which can be more sensitive to changes in markets, credit conditions, and interest rates
and may be considered speculative. Our use of derivatives may increase the risks of investing in the fund by increasing investment exposure
(which may be considered leverage) or, in the case of many over-the-counter instruments, because of the potential inability to terminate
or sell derivatives positions and the potential failure of the other party to the instrument to meet its obligations. The risk of a party
failing to meet its obligations may increase if the fund has significant investment exposure to that counterparty. The value of derivatives
may move in unexpected ways due to unanticipated market movements, the use of leverage, imperfect correlation between the derivative
instrument and the reference asset, or other factors, especially in unusual market conditions,&lt;/span&gt;&lt;/p&gt;



&lt;p&gt;
&lt;br/&gt;
&lt;br/&gt;
&lt;/p&gt;

&lt;div style="border-top: Black 1pt solid; margin: 18pt auto; font-size: 1pt"&gt;&#160;&lt;/div&gt;

&lt;p&gt;&lt;br/&gt;
&lt;br/&gt;
&lt;/p&gt;

&lt;p style="font: 10pt/1.5 Arial, Helvetica, Sans-Serif; margin: 0px 42px 9px; color: #000000; font-weight: 300; text-align: left"&gt;&lt;span style="-sec-ix-redline: true"&gt;and
volatility in the value of derivatives could adversely impact the fund&#x2019;s returns, obligations and exposures. Derivatives are also
subject to other risks, including liquidity risk (e.g., liquidity demands arising from the requirement to make payments to a derivative
counterparty), operational risk (e.g., settlement issues or system failures), and legal risk (e.g., insufficient legal documentation
or contract enforceability issues).&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt/1.5 Arial, Helvetica, Sans-Serif; margin: 0px 42px 9px; color: #000000; font-weight: 300; text-align: left"&gt;
There is no guarantee that the investment techniques, analyses, or judgments that we apply in making investment decisions for the fund will produce the intended outcome or that the investments we select for the fund will perform as well as other securities that were not selected for the fund. We, or the fund's other service providers, may experience disruptions or operating errors that could negatively impact the fund.
&lt;/p&gt;

&lt;p style="font: 10pt/1.5 Arial, Helvetica, Sans-Serif; margin: 0px 42px 9px; color: #000000; font-weight: 300; text-align: left"&gt;
The fund may be an investment option for mutual funds that are managed by Franklin Resources, Inc. (Franklin Templeton) and its affiliates as &#x201c;funds of funds&#x201d; and other investors with substantial investments in the fund. Such shareholders may at times be considered to control the fund. Dispositions of a large number of shares by these shareholders may adversely affect the fund's liquidity and net&#160;assets. These redemptions may also force the fund to sell securities, which may increase the fund's brokerage costs.
&lt;/p&gt;

&lt;p style="font: 10pt/1.5 Arial, Helvetica, Sans-Serif; margin: 0px 42px 9px; color: #000000; font-weight: 300; text-align: left"&gt;
The fund may not achieve its goal, and it is not intended to be a complete investment program. &lt;span id="xdx_907_err--RiskTextBlock_dU_c20240430__20240430__dei--LegalEntityAxis__custom--S000003895Member__rr--RiskAxis__rr--RiskNotInsuredDepositoryInstitutionMember_zRtWsIhwGut"&gt;An investment in the fund is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency.&lt;/span&gt;
&lt;/p&gt;

</rr:RiskTextBlock>
    <rr:RiskTextBlock
      contextRef="From2024-04-302024-04-30_custom_S000003895Member_rr_RiskLoseMoneyMember"
      id="Fact000414">It is important to understand that you can lose money by investing in the fund.</rr:RiskTextBlock>
    <rr:RiskTextBlock
      contextRef="From2024-04-302024-04-30_custom_S000003895Member_rr_RiskNotInsuredDepositoryInstitutionMember"
      id="Fact000416">An investment in the fund is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency.</rr:RiskTextBlock>
    <rr:BarChartAndPerformanceTableHeading
      contextRef="From2024-04-302024-04-30_custom_S000003895Member"
      id="Fact000417">Performance</rr:BarChartAndPerformanceTableHeading>
    <rr:PerformanceNarrativeTextBlock
      contextRef="From2024-04-302024-04-30_custom_S000003895Member"
      id="Fact000418">&lt;p id="xdx_A86_err--PerformanceNarrativeTextBlock_zghMUxDKFrgg" style="font: 10pt/1.5 Arial, Helvetica, Sans-Serif; margin: 0px 42px 9px; color: #000000; font-weight: 300; text-align: left"&gt;
&lt;span id="xdx_90C_err--PerformanceInformationIllustratesVariabilityOfReturns_dU_c20240430__20240430__dei--LegalEntityAxis__custom--S000003895Member_z2E2EkhlGuh6"&gt;The performance information below gives some indication of the risks associated with an investment in the fund by showing the fund&#x2019;s performance year to year and over time.&lt;/span&gt; The performance information does not reflect insurance-related charges or expenses. If it did, performance would be lower. &lt;span id="xdx_90E_err--PerformancePastDoesNotIndicateFuture_dU_c20240430__20240430__dei--LegalEntityAxis__custom--S000003895Member_zPWLV7gE2GT5"&gt;Please remember that past performance is not necessarily an indication of future results.&lt;/span&gt; 
&lt;/p&gt;

</rr:PerformanceNarrativeTextBlock>
    <rr:PerformanceInformationIllustratesVariabilityOfReturns
      contextRef="From2024-04-302024-04-30_custom_S000003895Member"
      id="Fact000419">The performance information below gives some indication of the risks associated with an investment in the fund by showing the fund&#x2019;s performance year to year and over time.</rr:PerformanceInformationIllustratesVariabilityOfReturns>
    <rr:PerformancePastDoesNotIndicateFuture
      contextRef="From2024-04-302024-04-30_custom_S000003895Member"
      id="Fact000420">Please remember that past performance is not necessarily an indication of future results.</rr:PerformancePastDoesNotIndicateFuture>
    <rr:BarChartHeading
      contextRef="From2024-04-302024-04-30_custom_S000003895Member"
      id="Fact000421">Annual total returns for class IA shares</rr:BarChartHeading>
    <rr:AnnualReturn2014
      contextRef="From2024-04-302024-04-30_custom_S000003895Member_custom_C000010885Member"
      decimals="INF"
      id="Fact000424"
      unitRef="Ratio">0.1093</rr:AnnualReturn2014>
    <rr:AnnualReturn2015
      contextRef="From2024-04-302024-04-30_custom_S000003895Member_custom_C000010885Member"
      decimals="INF"
      id="Fact000426"
      unitRef="Ratio">-0.0096</rr:AnnualReturn2015>
    <rr:AnnualReturn2016
      contextRef="From2024-04-302024-04-30_custom_S000003895Member_custom_C000010885Member"
      decimals="INF"
      id="Fact000428"
      unitRef="Ratio">0.0840</rr:AnnualReturn2016>
    <rr:AnnualReturn2017
      contextRef="From2024-04-302024-04-30_custom_S000003895Member_custom_C000010885Member"
      decimals="INF"
      id="Fact000430"
      unitRef="Ratio">0.1529</rr:AnnualReturn2017>
    <rr:AnnualReturn2018
      contextRef="From2024-04-302024-04-30_custom_S000003895Member_custom_C000010885Member"
      decimals="INF"
      id="Fact000432"
      unitRef="Ratio">-0.0282</rr:AnnualReturn2018>
    <rr:AnnualReturn2019
      contextRef="From2024-04-302024-04-30_custom_S000003895Member_custom_C000010885Member"
      decimals="INF"
      id="Fact000434"
      unitRef="Ratio">0.2435</rr:AnnualReturn2019>
    <rr:AnnualReturn2020
      contextRef="From2024-04-302024-04-30_custom_S000003895Member_custom_C000010885Member"
      decimals="INF"
      id="Fact000436"
      unitRef="Ratio">0.1561</rr:AnnualReturn2020>
    <rr:AnnualReturn2021
      contextRef="From2024-04-302024-04-30_custom_S000003895Member_custom_C000010885Member"
      decimals="INF"
      id="Fact000438"
      unitRef="Ratio">0.1428</rr:AnnualReturn2021>
    <rr:AnnualReturn2022
      contextRef="From2024-04-302024-04-30_custom_S000003895Member_custom_C000010885Member"
      decimals="INF"
      id="Fact000440"
      unitRef="Ratio">-0.1582</rr:AnnualReturn2022>
    <rr:AnnualReturn2023
      contextRef="From2024-04-302024-04-30_custom_S000003895Member_custom_C000010885Member"
      decimals="INF"
      id="Fact000442"
      unitRef="Ratio">0.2026</rr:AnnualReturn2023>
    <rr:YearToDateReturnLabel
      contextRef="From2024-04-302024-04-30_custom_S000003895Member"
      id="Fact000443">Year-to-date performance
through</rr:YearToDateReturnLabel>
    <rr:BarChartYearToDateReturnDate
      contextRef="From2024-04-302024-04-30_custom_S000003895Member"
      id="Fact000444">2024-03-31</rr:BarChartYearToDateReturnDate>
    <rr:BarChartYearToDateReturn
      contextRef="From2024-04-302024-04-30_custom_S000003895Member"
      decimals="INF"
      id="Fact000445"
      unitRef="Ratio">0.0751</rr:BarChartYearToDateReturn>
    <rr:HighestQuarterlyReturnLabel
      contextRef="From2024-04-302024-04-30_custom_S000003895Member"
      id="Fact000446">Best calendar quarter</rr:HighestQuarterlyReturnLabel>
    <rr:BarChartHighestQuarterlyReturnDate
      contextRef="From2024-04-302024-04-30_custom_S000003895Member"
      id="Fact000447">2020-06-30</rr:BarChartHighestQuarterlyReturnDate>
    <rr:BarChartHighestQuarterlyReturn
      contextRef="From2024-04-302024-04-30_custom_S000003895Member"
      decimals="INF"
      id="Fact000448"
      unitRef="Ratio">0.1444</rr:BarChartHighestQuarterlyReturn>
    <rr:LowestQuarterlyReturnLabel
      contextRef="From2024-04-302024-04-30_custom_S000003895Member"
      id="Fact000449">Worst calendar quarte</rr:LowestQuarterlyReturnLabel>
    <rr:BarChartLowestQuarterlyReturnDate
      contextRef="From2024-04-302024-04-30_custom_S000003895Member"
      id="Fact000450">2020-03-31</rr:BarChartLowestQuarterlyReturnDate>
    <rr:BarChartLowestQuarterlyReturn
      contextRef="From2024-04-302024-04-30_custom_S000003895Member"
      decimals="INF"
      id="Fact000451"
      unitRef="Ratio">-0.1164</rr:BarChartLowestQuarterlyReturn>
    <rr:PerformanceTableHeading
      contextRef="From2024-04-302024-04-30_custom_S000003895Member"
      id="Fact000452">Average
annual total returns

(for
periods ended 12/31/23)</rr:PerformanceTableHeading>
    <rr:AverageAnnualReturnYear01
      contextRef="From2024-04-302024-04-30_custom_S000003895Member_custom_C000010885Member"
      decimals="INF"
      id="Fact000454"
      unitRef="Ratio">0.2026</rr:AverageAnnualReturnYear01>
    <rr:AverageAnnualReturnYear05
      contextRef="From2024-04-302024-04-30_custom_S000003895Member_custom_C000010885Member"
      decimals="INF"
      id="Fact000455"
      unitRef="Ratio">0.1071</rr:AverageAnnualReturnYear05>
    <rr:AverageAnnualReturnYear10
      contextRef="From2024-04-302024-04-30_custom_S000003895Member_custom_C000010885Member"
      decimals="INF"
      id="Fact000456"
      unitRef="Ratio">0.0830</rr:AverageAnnualReturnYear10>
    <rr:AverageAnnualReturnYear01
      contextRef="From2024-04-302024-04-30_custom_S000003895Member_custom_C000010886Member"
      decimals="INF"
      id="Fact000457"
      unitRef="Ratio">0.1990</rr:AverageAnnualReturnYear01>
    <rr:AverageAnnualReturnYear05
      contextRef="From2024-04-302024-04-30_custom_S000003895Member_custom_C000010886Member"
      decimals="INF"
      id="Fact000458"
      unitRef="Ratio">0.1043</rr:AverageAnnualReturnYear05>
    <rr:AverageAnnualReturnYear10
      contextRef="From2024-04-302024-04-30_custom_S000003895Member_custom_C000010886Member"
      decimals="INF"
      id="Fact000459"
      unitRef="Ratio">0.0803</rr:AverageAnnualReturnYear10>
    <rr:AverageAnnualReturnYear01
      contextRef="From2024-04-302024-04-30_custom_S000003895Member_custom_GPBlendedIndexMember"
      decimals="INF"
      id="Fact000460"
      unitRef="Ratio">0.1782</rr:AverageAnnualReturnYear01>
    <rr:AverageAnnualReturnYear05
      contextRef="From2024-04-302024-04-30_custom_S000003895Member_custom_GPBlendedIndexMember"
      decimals="INF"
      id="Fact000461"
      unitRef="Ratio">0.1025</rr:AverageAnnualReturnYear05>
    <rr:AverageAnnualReturnYear10
      contextRef="From2024-04-302024-04-30_custom_S000003895Member_custom_GPBlendedIndexMember"
      decimals="INF"
      id="Fact000462"
      unitRef="Ratio">0.0827</rr:AverageAnnualReturnYear10>
    <rr:AverageAnnualReturnYear01
      contextRef="From2024-04-302024-04-30_custom_S000003895Member_custom_SP500IndexMember"
      decimals="INF"
      id="Fact000463"
      unitRef="Ratio">0.2629</rr:AverageAnnualReturnYear01>
    <rr:AverageAnnualReturnYear05
      contextRef="From2024-04-302024-04-30_custom_S000003895Member_custom_SP500IndexMember"
      decimals="INF"
      id="Fact000464"
      unitRef="Ratio">0.1569</rr:AverageAnnualReturnYear05>
    <rr:AverageAnnualReturnYear10
      contextRef="From2024-04-302024-04-30_custom_S000003895Member_custom_SP500IndexMember"
      decimals="INF"
      id="Fact000465"
      unitRef="Ratio">0.1203</rr:AverageAnnualReturnYear10>
    <rr:AverageAnnualReturnYear01
      contextRef="From2024-04-302024-04-30_custom_S000003895Member_custom_BLUSAggregateBondIndexMember"
      decimals="INF"
      id="Fact000466"
      unitRef="Ratio">0.0553</rr:AverageAnnualReturnYear01>
    <rr:AverageAnnualReturnYear05
      contextRef="From2024-04-302024-04-30_custom_S000003895Member_custom_BLUSAggregateBondIndexMember"
      decimals="INF"
      id="Fact000467"
      unitRef="Ratio">0.0110</rr:AverageAnnualReturnYear05>
    <rr:AverageAnnualReturnYear10
      contextRef="From2024-04-302024-04-30_custom_S000003895Member_custom_BLUSAggregateBondIndexMember"
      decimals="INF"
      id="Fact000468"
      unitRef="Ratio">0.0181</rr:AverageAnnualReturnYear10>
    <rr:PerformanceTableClosingTextBlock
      contextRef="From2024-04-302024-04-30_custom_S000003895Member"
      id="Fact000469">&lt;div id="xdx_A85_err--PerformanceTableClosingTextBlock_zFlLdSsa9pI6"&gt;&lt;/div&gt;
&lt;table style="font: 300 9pt/1.5 Arial, Helvetica, Sans-Serif; margin-left: 10px; width: 90%"&gt;
&lt;tr style="vertical-align: top"&gt;
&lt;td style="width: 25px; text-align: right"&gt;


&lt;/td&gt;
&lt;td&gt;
The fund's performance is compared to the George Putnam Blended Index, an unmanaged index administered by Putnam Management, 60% of which is the S&amp;amp;P 500 Index and 40% of which is the Bloomberg U.S. Aggregate Bond Index. The fund's performance is also compared to the S&amp;amp;P 500 Index, an unmanaged index of large U.S. company stocks. In addition, the fund's performance is compared to the Bloomberg U.S. Aggregate Bond Index, an unmanaged index of U.S. investment-grade fixed income securities.

&lt;/td&gt;

&lt;/tr&gt;
&lt;/table&gt;

&lt;table style="font: 300 9pt/1.5 Arial, Helvetica, Sans-Serif; margin-left: 10px; width: 90%"&gt;
&lt;tr style="vertical-align: top"&gt;
&lt;td style="width: 25px; text-align: right"&gt;


&lt;/td&gt;
&lt;td&gt;
All Bloomberg indices are provided by Bloomberg Index Services Limited.

&lt;/td&gt;

&lt;/tr&gt;
&lt;/table&gt;

&lt;table style="font: 300 9pt/1.5 Arial, Helvetica, Sans-Serif; margin-left: 10px; width: 90%"&gt;
&lt;tr style="vertical-align: top"&gt;
&lt;td style="width: 25px; text-align: right"&gt;


&lt;/td&gt;
&lt;td&gt;
BLOOMBERG&#xae; is a trademark and service mark of Bloomberg Finance L.P. and its affiliates (collectively &#x201c;Bloomberg&#x201d;). Bloomberg or Bloomberg&#x2019;s licensors, own all proprietary rights in the Bloomberg Indices. Neither Bloomberg nor Bloomberg&#x2019;s licensors approve or endorse this material, or guarantee the accuracy or completeness of any information herein, or make any warranty, express or implied, as to the results to be obtained therefrom, and to the maximum extent allowed by law, neither shall have any liability or responsibility for injury or damages arising in connection therewith.

&lt;/td&gt;

&lt;/tr&gt;
&lt;/table&gt;

</rr:PerformanceTableClosingTextBlock>
    <rr:RiskReturnHeading
      contextRef="From2024-04-302024-04-30_custom_S000003896Member"
      id="Fact000471">Fund summary</rr:RiskReturnHeading>
    <rr:ObjectiveHeading
      contextRef="From2024-04-302024-04-30_custom_S000003896Member"
      id="Fact000472">Goal</rr:ObjectiveHeading>
    <rr:ObjectivePrimaryTextBlock
      contextRef="From2024-04-302024-04-30_custom_S000003896Member"
      id="Fact000473">&lt;p id="xdx_A87_err--ObjectivePrimaryTextBlock_zwdTfPpMf3uk" style="font: 10pt/1.5 Arial, Helvetica, Sans-Serif; margin: 0px 42px 9px; color: #000000; font-weight: 300; text-align: left"&gt;
Putnam VT Global Asset Allocation Fund seeks long-term return consistent with preservation of capital.
&lt;/p&gt;

</rr:ObjectivePrimaryTextBlock>
    <rr:ExpenseHeading
      contextRef="From2024-04-302024-04-30_custom_S000003896Member"
      id="Fact000474">Fees and expenses</rr:ExpenseHeading>
    <rr:ExpenseNarrativeTextBlock
      contextRef="From2024-04-302024-04-30_custom_S000003896Member"
      id="Fact000475">&lt;p id="xdx_A8E_err--ExpenseNarrativeTextBlock_zfVXZHpetJ33" style="font: 10pt/1.5 Arial, Helvetica, Sans-Serif; margin: 0px 42px 9px; color: #000000; font-weight: 300; text-align: left"&gt;
The following table describes the fees and expenses you may pay if you buy, hold and sell shares of the fund. You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in the tables and examples below. The fees and expenses information does not reflect insurance-related charges or expenses borne by contract holders indirectly investing in the fund. If it did, expenses would be higher.
&lt;/p&gt;

</rr:ExpenseNarrativeTextBlock>
    <rr:OperatingExpensesCaption
      contextRef="From2024-04-302024-04-30_custom_S000003896Member"
      id="Fact000476">
Annual fund operating expenses 



(expenses you pay each year as a percentage of the value of your investment)
</rr:OperatingExpensesCaption>
    <rr:ManagementFeesOverAssets
      contextRef="From2024-04-302024-04-30_custom_S000003896Member_custom_C000010887Member"
      decimals="INF"
      id="Fact000478"
      unitRef="Ratio">0.0059</rr:ManagementFeesOverAssets>
    <rr:DistributionAndService12b1FeesOverAssets
      contextRef="From2024-04-302024-04-30_custom_S000003896Member_custom_C000010887Member"
      decimals="INF"
      id="Fact000479"
      unitRef="Ratio">0</rr:DistributionAndService12b1FeesOverAssets>
    <rr:OtherExpensesOverAssets
      contextRef="From2024-04-302024-04-30_custom_S000003896Member_custom_C000010887Member"
      decimals="INF"
      id="Fact000480"
      unitRef="Ratio">0.0034</rr:OtherExpensesOverAssets>
    <rr:ExpensesOverAssets
      contextRef="From2024-04-302024-04-30_custom_S000003896Member_custom_C000010887Member"
      decimals="INF"
      id="Fact000481"
      unitRef="Ratio">0.0093</rr:ExpensesOverAssets>
    <rr:FeeWaiverOrReimbursementOverAssets
      contextRef="From2024-04-302024-04-30_custom_S000003896Member_custom_C000010887Member"
      decimals="INF"
      id="Fact000482"
      unitRef="Ratio">-0.0007</rr:FeeWaiverOrReimbursementOverAssets>
    <rr:NetExpensesOverAssets
      contextRef="From2024-04-302024-04-30_custom_S000003896Member_custom_C000010887Member"
      decimals="INF"
      id="Fact000483"
      unitRef="Ratio">0.0086</rr:NetExpensesOverAssets>
    <rr:ManagementFeesOverAssets
      contextRef="From2024-04-302024-04-30_custom_S000003896Member_custom_C000010888Member"
      decimals="INF"
      id="Fact000484"
      unitRef="Ratio">0.0059</rr:ManagementFeesOverAssets>
    <rr:DistributionAndService12b1FeesOverAssets
      contextRef="From2024-04-302024-04-30_custom_S000003896Member_custom_C000010888Member"
      decimals="INF"
      id="Fact000485"
      unitRef="Ratio">0.0025</rr:DistributionAndService12b1FeesOverAssets>
    <rr:OtherExpensesOverAssets
      contextRef="From2024-04-302024-04-30_custom_S000003896Member_custom_C000010888Member"
      decimals="INF"
      id="Fact000486"
      unitRef="Ratio">0.0034</rr:OtherExpensesOverAssets>
    <rr:ExpensesOverAssets
      contextRef="From2024-04-302024-04-30_custom_S000003896Member_custom_C000010888Member"
      decimals="INF"
      id="Fact000487"
      unitRef="Ratio">0.0118</rr:ExpensesOverAssets>
    <rr:FeeWaiverOrReimbursementOverAssets
      contextRef="From2024-04-302024-04-30_custom_S000003896Member_custom_C000010888Member"
      decimals="INF"
      id="Fact000488"
      unitRef="Ratio">-0.0007</rr:FeeWaiverOrReimbursementOverAssets>
    <rr:NetExpensesOverAssets
      contextRef="From2024-04-302024-04-30_custom_S000003896Member_custom_C000010888Member"
      decimals="INF"
      id="Fact000489"
      unitRef="Ratio">0.0111</rr:NetExpensesOverAssets>
    <rr:FeeWaiverOrReimbursementOverAssetsDateOfTermination
      contextRef="From2024-04-302024-04-30_custom_S000003896Member"
      id="Fact000491">4/30/25</rr:FeeWaiverOrReimbursementOverAssetsDateOfTermination>
    <rr:ExpenseExampleHeading
      contextRef="From2024-04-302024-04-30_custom_S000003896Member"
      id="Fact000492">Example</rr:ExpenseExampleHeading>
    <rr:ExpenseExampleNarrativeTextBlock
      contextRef="From2024-04-302024-04-30_custom_S000003896Member"
      id="Fact000493">&lt;p id="xdx_A80_err--ExpenseExampleNarrativeTextBlock_z4R1NpPzu1B3" style="font: 10pt/1.5 Arial, Helvetica, Sans-Serif; margin: 0px 42px 9px; color: #000000; font-weight: 300; text-align: left"&gt;
The following hypothetical example is intended to help you compare the cost of investing in the fund with the cost of investing in other funds. The example does not reflect insurance-related charges or expenses. If it did, expenses would be higher. It assumes that you invest $10,000 in the fund for the time periods indicated and then redeem or hold all your shares at the end of those periods. It assumes a 5% return on your investment each year and that the fund&#x2019;s operating expenses remain the same. Only the first year of each period in the example takes into account the expense reimbursement described above. Your actual costs may be higher or lower.
&lt;/p&gt;

</rr:ExpenseExampleNarrativeTextBlock>
    <rr:ExpenseExampleYear01
      contextRef="From2024-04-302024-04-30_custom_S000003896Member_custom_C000010887Member"
      decimals="0"
      id="Fact000495"
      unitRef="USD">88</rr:ExpenseExampleYear01>
    <rr:ExpenseExampleYear03
      contextRef="From2024-04-302024-04-30_custom_S000003896Member_custom_C000010887Member"
      decimals="0"
      id="Fact000496"
      unitRef="USD">289</rr:ExpenseExampleYear03>
    <rr:ExpenseExampleYear05
      contextRef="From2024-04-302024-04-30_custom_S000003896Member_custom_C000010887Member"
      decimals="0"
      id="Fact000497"
      unitRef="USD">508</rr:ExpenseExampleYear05>
    <rr:ExpenseExampleYear10
      contextRef="From2024-04-302024-04-30_custom_S000003896Member_custom_C000010887Member"
      decimals="0"
      id="Fact000498"
      unitRef="USD">1137</rr:ExpenseExampleYear10>
    <rr:ExpenseExampleYear01
      contextRef="From2024-04-302024-04-30_custom_S000003896Member_custom_C000010888Member"
      decimals="0"
      id="Fact000499"
      unitRef="USD">113</rr:ExpenseExampleYear01>
    <rr:ExpenseExampleYear03
      contextRef="From2024-04-302024-04-30_custom_S000003896Member_custom_C000010888Member"
      decimals="0"
      id="Fact000500"
      unitRef="USD">368</rr:ExpenseExampleYear03>
    <rr:ExpenseExampleYear05
      contextRef="From2024-04-302024-04-30_custom_S000003896Member_custom_C000010888Member"
      decimals="0"
      id="Fact000501"
      unitRef="USD">642</rr:ExpenseExampleYear05>
    <rr:ExpenseExampleYear10
      contextRef="From2024-04-302024-04-30_custom_S000003896Member_custom_C000010888Member"
      decimals="0"
      id="Fact000502"
      unitRef="USD">1426</rr:ExpenseExampleYear10>
    <rr:PortfolioTurnoverHeading
      contextRef="From2024-04-302024-04-30_custom_S000003896Member"
      id="Fact000503">Portfolio turnover</rr:PortfolioTurnoverHeading>
    <rr:PortfolioTurnoverTextBlock
      contextRef="From2024-04-302024-04-30_custom_S000003896Member"
      id="Fact000504">&lt;p id="xdx_A81_err--PortfolioTurnoverTextBlock_zs4ckb5R16ii" style="font: 10pt/1.5 Arial, Helvetica, Sans-Serif; margin: 0px 42px 9px; color: #000000; font-weight: 300; text-align: left"&gt;&lt;span style="-sec-ix-redline: true"&gt;The
fund pays transaction-related costs, such as commissions, when it buys and sells securities (or &#x201c;turns over&#x201d; its portfolio).
A higher turnover rate may indicate higher transaction costs. These costs, which are not reflected in annual fund operating expenses
or the above example, affect fund performance. The fund&#x2019;s turnover rate in the most recent fiscal year was &lt;span id="xdx_908_err--PortfolioTurnoverRate_dU_c20240430__20240430__dei--LegalEntityAxis__custom--S000003896Member_zqGtf4TfrQJ2"&gt;262%&lt;/span&gt;.&lt;/span&gt;&lt;/p&gt;

</rr:PortfolioTurnoverTextBlock>
    <rr:PortfolioTurnoverRate
      contextRef="From2024-04-302024-04-30_custom_S000003896Member"
      decimals="INF"
      id="Fact000505"
      unitRef="Ratio">2.62</rr:PortfolioTurnoverRate>
    <rr:StrategyHeading
      contextRef="From2024-04-302024-04-30_custom_S000003896Member"
      id="Fact000506">Investments, risks, and performance</rr:StrategyHeading>
    <rr:StrategyNarrativeTextBlock
      contextRef="From2024-04-302024-04-30_custom_S000003896Member"
      id="Fact000507">&lt;p id="xdx_A87_err--StrategyNarrativeTextBlock_zrkPw9nMFtNl" style="font: 600 10pt/1.5 Arial, Helvetica, Sans-Serif; margin: 15px 42px 0px; color: #000000"&gt;
&lt;b&gt;Investments&lt;/b&gt;
&lt;/p&gt;

&lt;p style="font: 10pt/1.5 Arial, Helvetica, Sans-Serif; margin: 0px 42px 9px; color: #000000; font-weight: 300; text-align: left"&gt;
We invest a majority of the fund&#x2019;s assets in a diversified portfolio of equity securities (growth or value stocks or both) of both U.S. and foreign companies of any size. We may consider, among other factors, a company&#x2019;s valuation, financial strength, growth potential, competitive position in its industry, projected future earnings, cash flows and dividends when deciding whether to buy or sell equity investments. We also invest in a diversified portfolio of fixed-income investments, including both U.S. and foreign government obligations, corporate obligations and securitized debt instruments (such as mortgage-backed investments). We may consider, among other factors, credit, interest rate and prepayment risks, as well as general market conditions, when deciding whether to buy or sell fixed income investments. We may also select other investments that do not fall within these asset classes. We may also use to a significant extent derivatives, such as futures, options, certain foreign currency transactions, warrants and swap contracts, for both hedging and non-hedging purposes.
&lt;/p&gt;

</rr:StrategyNarrativeTextBlock>
    <rr:RiskHeading
      contextRef="From2024-04-302024-04-30_custom_S000003896Member"
      id="Fact000508">Risks</rr:RiskHeading>
    <rr:RiskTextBlock
      contextRef="From2024-04-302024-04-30_custom_S000003896Member"
      id="Fact000509">&lt;p id="xdx_A8A_err--RiskTextBlock_zoe9QvqnS5bc" style="font: 10pt/1.5 Arial, Helvetica, Sans-Serif; margin: 0px 42px 9px; color: #000000; font-weight: 300; text-align: left"&gt;
&lt;span id="xdx_905_err--RiskTextBlock_dU_c20240430__20240430__dei--LegalEntityAxis__custom--S000003896Member__rr--RiskAxis__rr--RiskLoseMoneyMember_zIs6HGqblLb7"&gt;It is important to understand that you can lose money by investing in the fund.&lt;/span&gt;
&lt;/p&gt;

&lt;p style="font: 10pt/1.5 Arial, Helvetica, Sans-Serif; margin: 0px 42px 9px; color: #000000; font-weight: 300; text-align: left"&gt;
Our allocation of assets among asset classes may hurt performance, and our efforts to diversify risk through the use of leverage and allocation decisions may not be successful. If the quantitative models or data that are used in managing the fund prove to be incorrect or incomplete, investment decisions made in reliance on the models or data may not produce the desired results and the fund may realize losses.
&lt;/p&gt;

&lt;p style="font: 10pt/1.5 Arial, Helvetica, Sans-Serif; margin: 0px 42px 9px; color: #000000; font-weight: 300; text-align: left"&gt;
The value of investments in the fund&#x2019;s portfolio may fall or fail to rise over extended periods of time for a variety of reasons, including general economic, political or financial market conditions, investor sentiment and market perceptions, government actions, geopolitical events or changes, outbreaks of infectious illnesses or other widespread public health issues, and factors related to a specific issuer, geography, industry or sector. These and other factors may lead to increased volatility and reduced liquidity in the fund&#x2019;s portfolio holdings, may negatively impact the fund&#x2019;s performance, and may exacerbate other risks to which the fund is subject. Growth stocks may be more susceptible to earnings disappointments, and value stocks may fail to rebound. These risks are generally greater for small and midsize companies.
&lt;/p&gt;

&lt;p style="font: 10pt/1.5 Arial, Helvetica, Sans-Serif; margin: 0px 42px 9px; color: #000000; font-weight: 300; text-align: left"&gt;&lt;span style="-sec-ix-redline: true"&gt;Bond
investments are subject to interest rate risk, which is the risk that the value of the fund&#x2019;s bond investments is likely to fall
if interest rates rise. Bond investments also are subject to credit risk, which is the risk that the issuer of the bond may default on
payment of interest or principal. Bond investments may be more susceptible to downgrades or default during economic downturns or other
periods of economic stress. Interest rate risk is generally greater for longer-term bonds, and credit risk is generally greater for below-investment-grade
bonds (sometimes&lt;/span&gt;&lt;/p&gt;



&lt;p&gt;
&lt;br/&gt;
&lt;br/&gt;
&lt;/p&gt;

&lt;div style="border-top: Black 1pt solid; margin: 18pt auto; font-size: 1pt"&gt;&#160;&lt;/div&gt;

&lt;p&gt;&lt;br/&gt;
&lt;br/&gt;
&lt;/p&gt;

&lt;p style="font: 10pt/1.5 Arial, Helvetica, Sans-Serif; margin: 0px 42px 9px; color: #000000; font-weight: 300; text-align: left"&gt;&lt;span style="-sec-ix-redline: true"&gt;referred
to as &#x201c;junk bonds&#x201d;), which can be more sensitive to changes in markets, credit conditions, and interest rates, and may be
considered speculative. Mortgage-backed investments, unlike traditional debt investments, are also subject to prepayment risk, which
means that they may increase in value less than other bonds when interest rates decline and decline in value more than other bonds when
interest rates rise. We may have to invest the proceeds from prepaid investments, including mortgage- and asset-backed investments, in
other investments with less attractive terms and yields.&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt/1.5 Arial, Helvetica, Sans-Serif; margin: 0px 42px 9px; color: #000000; font-weight: 300; text-align: left"&gt;
The value of international investments traded in foreign currencies may be adversely impacted by fluctuations in exchange rates. International investments, particularly investments in emerging markets, may carry risks associated with potentially less stable economies or governments (such as the risk of seizure by a foreign government, the imposition of currency or other restrictions, or high levels of inflation), and may be or become illiquid.
&lt;/p&gt;

&lt;p style="font: 10pt/1.5 Arial, Helvetica, Sans-Serif; margin: 0px 42px 9px; color: #000000; font-weight: 300; text-align: left"&gt;
Our use of derivatives may increase the risks of investing in the fund by increasing investment exposure (which may be considered leverage) or, in the case of many over-the-counter instruments, because of the potential inability to terminate or sell derivative positions and the potential failure of the other party to the instrument to meet its obligations. The risk of a party failing to meet its obligations may increase if the fund has significant investment exposure to that counterparty. The value of derivatives may move in unexpected ways due to unanticipated market movements, the use of leverage, imperfect correlation between the derivative instrument and the reference asset, or other factors, especially in unusual market conditions, and volatility in the value of derivatives could adversely impact the fund&#x2019;s returns, obligations and exposures. Derivatives are also subject to other risks, including liquidity risk (e.g., liquidity demands arising from the requirement to make payments to a derivative counterparty), operational risk (e.g., settlement issues or system failures), and legal risk (e.g., insufficient legal documentation or contract enforceability issues).
&lt;/p&gt;

&lt;p style="font: 10pt/1.5 Arial, Helvetica, Sans-Serif; margin: 0px 42px 9px; color: #000000; font-weight: 300; text-align: left"&gt;
There is no guarantee that the investment techniques, analyses, or judgments that we apply in making investment decisions for the fund will produce the intended outcome or that the investments we select for the fund will perform as well as other securities that were not selected for the fund. We, or the fund&#x2019;s other service providers, may experience disruptions or operating errors that could negatively impact the fund. 
&lt;/p&gt;

&lt;p style="font: 10pt/1.5 Arial, Helvetica, Sans-Serif; margin: 0px 42px 9px; color: #000000; font-weight: 300; text-align: left"&gt;&lt;span style="-sec-ix-redline: true"&gt;The
fund may be an investment option for mutual funds that are managed by Franklin Resources, Inc. (Franklin Templeton) and its affiliates
as &#x201c;funds of funds&#x201d; and other investors with substantial investments in the fund. Such shareholders may at times be considered
to control the fund. Dispositions of a large number of shares by these shareholders may adversely affect the fund&#x2019;s liquidity and
net&#160;assets. These redemptions may also force the fund to sell securities, which may increase the fund&#x2019;s brokerage costs.&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt/1.5 Arial, Helvetica, Sans-Serif; margin: 0px 42px 9px; color: #000000; font-weight: 300; text-align: left"&gt;
The fund may not achieve its goal, and it is not intended to be a complete investment program. &lt;span id="xdx_902_err--RiskTextBlock_dU_c20240430__20240430__dei--LegalEntityAxis__custom--S000003896Member__rr--RiskAxis__rr--RiskNotInsuredDepositoryInstitutionMember_zDuTA8NYKK8f"&gt;An investment in the fund is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency.&lt;/span&gt;
&lt;/p&gt;

</rr:RiskTextBlock>
    <rr:RiskTextBlock
      contextRef="From2024-04-302024-04-30_custom_S000003896Member_rr_RiskLoseMoneyMember"
      id="Fact000510">It is important to understand that you can lose money by investing in the fund.</rr:RiskTextBlock>
    <rr:RiskTextBlock
      contextRef="From2024-04-302024-04-30_custom_S000003896Member_rr_RiskNotInsuredDepositoryInstitutionMember"
      id="Fact000512">An investment in the fund is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency.</rr:RiskTextBlock>
    <rr:BarChartAndPerformanceTableHeading
      contextRef="From2024-04-302024-04-30_custom_S000003896Member"
      id="Fact000513">Performance</rr:BarChartAndPerformanceTableHeading>
    <rr:BarChartNarrativeTextBlock
      contextRef="From2024-04-302024-04-30_custom_S000003896Member"
      id="Fact000514">&lt;p id="xdx_A8E_err--BarChartNarrativeTextBlock_zFOEPWfUXVhj" style="font: 10pt/1.5 Arial, Helvetica, Sans-Serif; margin: 0px 42px 9px; color: #000000; font-weight: 300; text-align: left"&gt;
&lt;span id="xdx_90F_err--PerformanceInformationIllustratesVariabilityOfReturns_dU_c20240430__20240430__dei--LegalEntityAxis__custom--S000003896Member_zd9y11FxeIM2"&gt;The performance information below gives some indication of the risks associated with an investment in the fund by showing the fund&#x2019;s performance year to year and over time.&lt;/span&gt; The performance information does not reflect insurance-related charges or expenses. If it did, performance would be lower. &lt;span id="xdx_909_err--PerformancePastDoesNotIndicateFuture_dU_c20240430__20240430__dei--LegalEntityAxis__custom--S000003896Member_zc4QS5CYVPv5"&gt;Please remember that past performance is not necessarily an indication of future results.&lt;/span&gt; 
&lt;/p&gt;

</rr:BarChartNarrativeTextBlock>
    <rr:PerformanceInformationIllustratesVariabilityOfReturns
      contextRef="From2024-04-302024-04-30_custom_S000003896Member"
      id="Fact000515">The performance information below gives some indication of the risks associated with an investment in the fund by showing the fund&#x2019;s performance year to year and over time.</rr:PerformanceInformationIllustratesVariabilityOfReturns>
    <rr:PerformancePastDoesNotIndicateFuture
      contextRef="From2024-04-302024-04-30_custom_S000003896Member"
      id="Fact000516">Please remember that past performance is not necessarily an indication of future results.</rr:PerformancePastDoesNotIndicateFuture>
    <rr:BarChartHeading
      contextRef="From2024-04-302024-04-30_custom_S000003896Member"
      id="Fact000517">Annual total returns for class IA shares</rr:BarChartHeading>
    <rr:AnnualReturn2014
      contextRef="From2024-04-302024-04-30_custom_S000003896Member_custom_C000010887Member"
      decimals="INF"
      id="Fact000520"
      unitRef="Ratio">0.0966</rr:AnnualReturn2014>
    <rr:AnnualReturn2015
      contextRef="From2024-04-302024-04-30_custom_S000003896Member_custom_C000010887Member"
      decimals="INF"
      id="Fact000522"
      unitRef="Ratio">0.0042</rr:AnnualReturn2015>
    <rr:AnnualReturn2016
      contextRef="From2024-04-302024-04-30_custom_S000003896Member_custom_C000010887Member"
      decimals="INF"
      id="Fact000524"
      unitRef="Ratio">0.0698</rr:AnnualReturn2016>
    <rr:AnnualReturn2017
      contextRef="From2024-04-302024-04-30_custom_S000003896Member_custom_C000010887Member"
      decimals="INF"
      id="Fact000526"
      unitRef="Ratio">0.1567</rr:AnnualReturn2017>
    <rr:AnnualReturn2018
      contextRef="From2024-04-302024-04-30_custom_S000003896Member_custom_C000010887Member"
      decimals="INF"
      id="Fact000528"
      unitRef="Ratio">-0.0702</rr:AnnualReturn2018>
    <rr:AnnualReturn2019
      contextRef="From2024-04-302024-04-30_custom_S000003896Member_custom_C000010887Member"
      decimals="INF"
      id="Fact000530"
      unitRef="Ratio">0.1742</rr:AnnualReturn2019>
    <rr:AnnualReturn2020
      contextRef="From2024-04-302024-04-30_custom_S000003896Member_custom_C000010887Member"
      decimals="INF"
      id="Fact000532"
      unitRef="Ratio">0.1258</rr:AnnualReturn2020>
    <rr:AnnualReturn2021
      contextRef="From2024-04-302024-04-30_custom_S000003896Member_custom_C000010887Member"
      decimals="INF"
      id="Fact000534"
      unitRef="Ratio">0.1425</rr:AnnualReturn2021>
    <rr:AnnualReturn2022
      contextRef="From2024-04-302024-04-30_custom_S000003896Member_custom_C000010887Member"
      decimals="INF"
      id="Fact000536"
      unitRef="Ratio">-0.1582</rr:AnnualReturn2022>
    <rr:AnnualReturn2023
      contextRef="From2024-04-302024-04-30_custom_S000003896Member_custom_C000010887Member"
      decimals="INF"
      id="Fact000538"
      unitRef="Ratio">0.1778</rr:AnnualReturn2023>
    <rr:YearToDateReturnLabel
      contextRef="From2024-04-302024-04-30_custom_S000003896Member"
      id="Fact000539">Year-to-date performance
through</rr:YearToDateReturnLabel>
    <rr:BarChartYearToDateReturnDate
      contextRef="From2024-04-302024-04-30_custom_S000003896Member"
      id="Fact000540">2024-03-31</rr:BarChartYearToDateReturnDate>
    <rr:BarChartYearToDateReturn
      contextRef="From2024-04-302024-04-30_custom_S000003896Member"
      decimals="INF"
      id="Fact000541"
      unitRef="Ratio">0.0765</rr:BarChartYearToDateReturn>
    <rr:HighestQuarterlyReturnLabel
      contextRef="From2024-04-302024-04-30_custom_S000003896Member"
      id="Fact000542">Best calendar quarter</rr:HighestQuarterlyReturnLabel>
    <rr:BarChartHighestQuarterlyReturnDate
      contextRef="From2024-04-302024-04-30_custom_S000003896Member"
      id="Fact000543">2020-06-30</rr:BarChartHighestQuarterlyReturnDate>
    <rr:BarChartHighestQuarterlyReturn
      contextRef="From2024-04-302024-04-30_custom_S000003896Member"
      decimals="INF"
      id="Fact000544"
      unitRef="Ratio">0.1290</rr:BarChartHighestQuarterlyReturn>
    <rr:LowestQuarterlyReturnLabel
      contextRef="From2024-04-302024-04-30_custom_S000003896Member"
      id="Fact000545">Worst calendar quarter</rr:LowestQuarterlyReturnLabel>
    <rr:BarChartLowestQuarterlyReturnDate
      contextRef="From2024-04-302024-04-30_custom_S000003896Member"
      id="Fact000546">2020-03-31</rr:BarChartLowestQuarterlyReturnDate>
    <rr:BarChartLowestQuarterlyReturn
      contextRef="From2024-04-302024-04-30_custom_S000003896Member"
      decimals="INF"
      id="Fact000547"
      unitRef="Ratio">-0.1277</rr:BarChartLowestQuarterlyReturn>
    <rr:PerformanceTableHeading
      contextRef="From2024-04-302024-04-30_custom_S000003896Member"
      id="Fact000548">Average
annual total returns

(for
periods ended 12/31/23)</rr:PerformanceTableHeading>
    <rr:AverageAnnualReturnYear01
      contextRef="From2024-04-302024-04-30_custom_S000003896Member_custom_C000010887Member"
      decimals="INF"
      id="Fact000550"
      unitRef="Ratio">0.1778</rr:AverageAnnualReturnYear01>
    <rr:AverageAnnualReturnYear05
      contextRef="From2024-04-302024-04-30_custom_S000003896Member_custom_C000010887Member"
      decimals="INF"
      id="Fact000551"
      unitRef="Ratio">0.0841</rr:AverageAnnualReturnYear05>
    <rr:AverageAnnualReturnYear10
      contextRef="From2024-04-302024-04-30_custom_S000003896Member_custom_C000010887Member"
      decimals="INF"
      id="Fact000552"
      unitRef="Ratio">0.0661</rr:AverageAnnualReturnYear10>
    <rr:AverageAnnualReturnYear01
      contextRef="From2024-04-302024-04-30_custom_S000003896Member_custom_C000010888Member"
      decimals="INF"
      id="Fact000553"
      unitRef="Ratio">0.1748</rr:AverageAnnualReturnYear01>
    <rr:AverageAnnualReturnYear05
      contextRef="From2024-04-302024-04-30_custom_S000003896Member_custom_C000010888Member"
      decimals="INF"
      id="Fact000554"
      unitRef="Ratio">0.0814</rr:AverageAnnualReturnYear05>
    <rr:AverageAnnualReturnYear10
      contextRef="From2024-04-302024-04-30_custom_S000003896Member_custom_C000010888Member"
      decimals="INF"
      id="Fact000555"
      unitRef="Ratio">0.0635</rr:AverageAnnualReturnYear10>
    <rr:AverageAnnualReturnYear01
      contextRef="From2024-04-302024-04-30_custom_S000003896Member_custom_Russell3000IndexMember"
      decimals="INF"
      id="Fact000556"
      unitRef="Ratio">0.2596</rr:AverageAnnualReturnYear01>
    <rr:AverageAnnualReturnYear05
      contextRef="From2024-04-302024-04-30_custom_S000003896Member_custom_Russell3000IndexMember"
      decimals="INF"
      id="Fact000557"
      unitRef="Ratio">0.1516</rr:AverageAnnualReturnYear05>
    <rr:AverageAnnualReturnYear10
      contextRef="From2024-04-302024-04-30_custom_S000003896Member_custom_Russell3000IndexMember"
      decimals="INF"
      id="Fact000558"
      unitRef="Ratio">0.1148</rr:AverageAnnualReturnYear10>
    <rr:AverageAnnualReturnYear01
      contextRef="From2024-04-302024-04-30_custom_S000003896Member_custom_PutnamBalancedBlendedIndexMember"
      decimals="INF"
      id="Fact000559"
      unitRef="Ratio">0.1721</rr:AverageAnnualReturnYear01>
    <rr:AverageAnnualReturnYear05
      contextRef="From2024-04-302024-04-30_custom_S000003896Member_custom_PutnamBalancedBlendedIndexMember"
      decimals="INF"
      id="Fact000560"
      unitRef="Ratio">0.0924</rr:AverageAnnualReturnYear05>
    <rr:AverageAnnualReturnYear10
      contextRef="From2024-04-302024-04-30_custom_S000003896Member_custom_PutnamBalancedBlendedIndexMember"
      decimals="INF"
      id="Fact000561"
      unitRef="Ratio">0.0722</rr:AverageAnnualReturnYear10>
    <rr:PerformanceTableClosingTextBlock
      contextRef="From2024-04-302024-04-30_custom_S000003896Member"
      id="Fact000562">&lt;div id="xdx_A80_err--PerformanceTableClosingTextBlock_zmDKrLVFkGUl"&gt;&lt;/div&gt;
&lt;table style="font: 300 9pt/1.5 Arial, Helvetica, Sans-Serif; margin-left: 10px; width: 90%"&gt;
&lt;tr style="vertical-align: top"&gt;
&lt;td style="width: 25px; text-align: right"&gt;&lt;/td&gt;
&lt;td&gt;&lt;span style="-sec-ix-redline: true"&gt;Putnam Balanced Blended Benchmark is an unmanaged index administered by Putnam Investment Management, LLC, 50% of which is the
Russell 3000&#xae; Index, 35% of which is the Bloomberg U.S. Aggregate Bond Index, 10% of which is the MSCI EAFE Index (ND) and 5% of
which is the JPMorgan Developed High Yield Index.&lt;/span&gt;&lt;/td&gt;

&lt;/tr&gt;
&lt;/table&gt;

&lt;table style="font: 300 9pt/1.5 Arial, Helvetica, Sans-Serif; margin-left: 10px; width: 90%"&gt;
&lt;tr style="vertical-align: top"&gt;
&lt;td style="width: 25px; text-align: right"&gt;


&lt;/td&gt;
&lt;td&gt;
Frank Russell Company is the source and owner of the trademarks, service marks and copyrights related to the Russell Indexes. Russell&#xae; is a trademark of Frank Russell Company.

&lt;/td&gt;

&lt;/tr&gt;
&lt;/table&gt;

&lt;table style="font: 300 9pt/1.5 Arial, Helvetica, Sans-Serif; margin-left: 10px; width: 90%"&gt;
&lt;tr style="vertical-align: top"&gt;
&lt;td style="width: 25px; text-align: right"&gt;


&lt;/td&gt;
&lt;td&gt;
All Bloomberg indices are provided by Bloomberg Index Services Limited.

&lt;/td&gt;

&lt;/tr&gt;
&lt;/table&gt;

&lt;table style="font: 300 9pt/1.5 Arial, Helvetica, Sans-Serif; margin-left: 10px; width: 90%"&gt;
&lt;tr style="vertical-align: top"&gt;
&lt;td style="width: 25px; text-align: right"&gt;


&lt;/td&gt;
&lt;td&gt;
BLOOMBERG&#xae; is a trademark and service mark of Bloomberg Finance L.P. and its affiliates (collectively &#x201c;Bloomberg&#x201d;). Bloomberg or Bloomberg&#x2019;s licensors, own all proprietary rights in the Bloomberg Indices. Neither Bloomberg nor Bloomberg&#x2019;s licensors approve or endorse this material, or guarantee the accuracy or completeness of any information herein, or make any warranty, express or implied, as to the results to be obtained therefrom, and to the maximum extent allowed by law, neither shall have any liability or responsibility for injury or damages arising in connection therewith.

&lt;/td&gt;

&lt;/tr&gt;
&lt;/table&gt;

&lt;table style="font: 300 9pt/1.5 Arial, Helvetica, Sans-Serif; margin-left: 10px; width: 90%"&gt;
&lt;tr style="vertical-align: top"&gt;
&lt;td style="width: 25px; text-align: right"&gt;&lt;/td&gt;
&lt;td&gt;&lt;span style="-sec-ix-redline: true"&gt;All MSCI indices are provided by MSCI.&lt;/span&gt;&lt;/td&gt;

&lt;/tr&gt;
&lt;/table&gt;



&lt;p&gt;
&lt;br/&gt;
&lt;br/&gt;
&lt;/p&gt;

&lt;div style="border-top: Black 1pt solid; margin: 18pt auto; font-size: 1pt"&gt;&#160;&lt;/div&gt;

&lt;p&gt;&lt;br/&gt;
&lt;br/&gt;
&lt;/p&gt;

&lt;table style="font: 300 9pt/1.5 Arial, Helvetica, Sans-Serif; margin-left: 10px; width: 90%"&gt;
&lt;tr style="vertical-align: top"&gt;
&lt;td style="width: 25px; text-align: right"&gt;&lt;/td&gt;
&lt;td&gt;&lt;span style="-sec-ix-redline: true"&gt;MSCI makes no warranties and shall have no liability with respect to any MSCI data reproduced herein. No further redistribution
or use is permitted. This report is not prepared or endorsed by MSCI. Important data provider notices and terms available at www.franklintempletondatasources.com.
You cannot invest directly in an index.&lt;/span&gt;&lt;/td&gt;

&lt;/tr&gt;
&lt;/table&gt;

</rr:PerformanceTableClosingTextBlock>
    <rr:RiskReturnHeading
      contextRef="From2024-04-302024-04-30_custom_S000003874Member"
      id="Fact000565">Fund summary</rr:RiskReturnHeading>
    <rr:ObjectiveHeading
      contextRef="From2024-04-302024-04-30_custom_S000003874Member"
      id="Fact000566">Goal</rr:ObjectiveHeading>
    <rr:ObjectivePrimaryTextBlock
      contextRef="From2024-04-302024-04-30_custom_S000003874Member"
      id="Fact000567">&lt;p id="xdx_A89_err--ObjectivePrimaryTextBlock_zeeERzdvTL1" style="font: 10pt/1.5 Arial, Helvetica, Sans-Serif; margin: 0px 42px 9px; color: #000000; font-weight: 300; text-align: left"&gt;
Putnam VT Global Health Care Fund seeks capital appreciation. 
&lt;/p&gt;

</rr:ObjectivePrimaryTextBlock>
    <rr:ExpenseHeading
      contextRef="From2024-04-302024-04-30_custom_S000003874Member"
      id="Fact000568">Fees and expenses</rr:ExpenseHeading>
    <rr:ExpenseNarrativeTextBlock
      contextRef="From2024-04-302024-04-30_custom_S000003874Member"
      id="Fact000569">&lt;p id="xdx_A81_err--ExpenseNarrativeTextBlock_zK1AWAfT8CHc" style="font: 10pt/1.5 Arial, Helvetica, Sans-Serif; margin: 0px 42px 9px; color: #000000; font-weight: 300; text-align: left"&gt;
The following table describes the fees and expenses you may pay if you buy, hold and sell shares of the fund. You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in the tables and examples below. The fees and expenses information does not reflect insurance-related charges or expenses borne by contract holders indirectly investing in the fund. If it did, expenses would be higher.
&lt;/p&gt;

</rr:ExpenseNarrativeTextBlock>
    <rr:OperatingExpensesCaption
      contextRef="From2024-04-302024-04-30_custom_S000003874Member"
      id="Fact000570">
Annual fund operating expenses



(expenses you pay each year as a percentage of the value of your investment)
</rr:OperatingExpensesCaption>
    <rr:ManagementFeesOverAssets
      contextRef="From2024-04-302024-04-30_custom_S000003874Member_custom_C000010843Member"
      decimals="INF"
      id="Fact000572"
      unitRef="Ratio">0.0062</rr:ManagementFeesOverAssets>
    <rr:DistributionAndService12b1FeesOverAssets
      contextRef="From2024-04-302024-04-30_custom_S000003874Member_custom_C000010843Member"
      decimals="INF"
      id="Fact000573"
      unitRef="Ratio">0</rr:DistributionAndService12b1FeesOverAssets>
    <rr:OtherExpensesOverAssets
      contextRef="From2024-04-302024-04-30_custom_S000003874Member_custom_C000010843Member"
      decimals="INF"
      id="Fact000574"
      unitRef="Ratio">0.0014</rr:OtherExpensesOverAssets>
    <rr:ExpensesOverAssets
      contextRef="From2024-04-302024-04-30_custom_S000003874Member_custom_C000010843Member"
      decimals="INF"
      id="Fact000575"
      unitRef="Ratio">0.0076</rr:ExpensesOverAssets>
    <rr:ManagementFeesOverAssets
      contextRef="From2024-04-302024-04-30_custom_S000003874Member_custom_C000010844Member"
      decimals="INF"
      id="Fact000576"
      unitRef="Ratio">0.0062</rr:ManagementFeesOverAssets>
    <rr:DistributionAndService12b1FeesOverAssets
      contextRef="From2024-04-302024-04-30_custom_S000003874Member_custom_C000010844Member"
      decimals="INF"
      id="Fact000577"
      unitRef="Ratio">0.0025</rr:DistributionAndService12b1FeesOverAssets>
    <rr:OtherExpensesOverAssets
      contextRef="From2024-04-302024-04-30_custom_S000003874Member_custom_C000010844Member"
      decimals="INF"
      id="Fact000578"
      unitRef="Ratio">0.0014</rr:OtherExpensesOverAssets>
    <rr:ExpensesOverAssets
      contextRef="From2024-04-302024-04-30_custom_S000003874Member_custom_C000010844Member"
      decimals="INF"
      id="Fact000579"
      unitRef="Ratio">0.0101</rr:ExpensesOverAssets>
    <rr:ExpenseExampleHeading
      contextRef="From2024-04-302024-04-30_custom_S000003874Member"
      id="Fact000580">Example</rr:ExpenseExampleHeading>
    <rr:ExpenseExampleNarrativeTextBlock
      contextRef="From2024-04-302024-04-30_custom_S000003874Member"
      id="Fact000581">&lt;p id="xdx_A84_err--ExpenseExampleNarrativeTextBlock_zOuWwG2bTH3b" style="font: 10pt/1.5 Arial, Helvetica, Sans-Serif; margin: 0px 42px 9px; color: #000000; font-weight: 300; text-align: left"&gt;
The following hypothetical example is intended to help you compare the cost of investing in the fund with the cost of investing in other funds. The example does not reflect insurance-related charges or expenses. If it did, expenses would be higher. It assumes that you invest $10,000 in the fund for the time periods indicated and then redeem or hold all your shares at the end of those periods. It assumes a 5% return on your investment each year and that the fund&#x2019;s operating expenses remain the same. Your actual costs may be higher or lower.
&lt;/p&gt;

</rr:ExpenseExampleNarrativeTextBlock>
    <rr:ExpenseExampleYear01
      contextRef="From2024-04-302024-04-30_custom_S000003874Member_custom_C000010843Member"
      decimals="0"
      id="Fact000583"
      unitRef="USD">78</rr:ExpenseExampleYear01>
    <rr:ExpenseExampleYear03
      contextRef="From2024-04-302024-04-30_custom_S000003874Member_custom_C000010843Member"
      decimals="0"
      id="Fact000584"
      unitRef="USD">248</rr:ExpenseExampleYear03>
    <rr:ExpenseExampleYear05
      contextRef="From2024-04-302024-04-30_custom_S000003874Member_custom_C000010843Member"
      decimals="0"
      id="Fact000585"
      unitRef="USD">422</rr:ExpenseExampleYear05>
    <rr:ExpenseExampleYear10
      contextRef="From2024-04-302024-04-30_custom_S000003874Member_custom_C000010843Member"
      decimals="0"
      id="Fact000586"
      unitRef="USD">942</rr:ExpenseExampleYear10>
    <rr:ExpenseExampleYear01
      contextRef="From2024-04-302024-04-30_custom_S000003874Member_custom_C000010844Member"
      decimals="0"
      id="Fact000587"
      unitRef="USD">103</rr:ExpenseExampleYear01>
    <rr:ExpenseExampleYear03
      contextRef="From2024-04-302024-04-30_custom_S000003874Member_custom_C000010844Member"
      decimals="0"
      id="Fact000588"
      unitRef="USD">322</rr:ExpenseExampleYear03>
    <rr:ExpenseExampleYear05
      contextRef="From2024-04-302024-04-30_custom_S000003874Member_custom_C000010844Member"
      decimals="0"
      id="Fact000589"
      unitRef="USD">558</rr:ExpenseExampleYear05>
    <rr:ExpenseExampleYear10
      contextRef="From2024-04-302024-04-30_custom_S000003874Member_custom_C000010844Member"
      decimals="0"
      id="Fact000590"
      unitRef="USD">1236</rr:ExpenseExampleYear10>
    <rr:PortfolioTurnoverHeading
      contextRef="From2024-04-302024-04-30_custom_S000003874Member"
      id="Fact000591">Portfolio turnover</rr:PortfolioTurnoverHeading>
    <rr:PortfolioTurnoverTextBlock
      contextRef="From2024-04-302024-04-30_custom_S000003874Member"
      id="Fact000592">&lt;p id="xdx_A80_err--PortfolioTurnoverTextBlock_zX82ZXzpnSb3" style="font: 10pt/1.5 Arial, Helvetica, Sans-Serif; margin: 0px 42px 9px; color: #000000; font-weight: 300; text-align: left"&gt;&lt;span style="-sec-ix-redline: true"&gt;The
fund pays transaction-related costs, such as commissions, when it buys and sells securities (or &#x201c;turns over&#x201d; its portfolio).
A higher turnover rate may indicate higher transaction costs. These costs, which are not reflected in annual fund operating expenses
or the above example, affect fund performance. The fund&#x2019;s turnover rate in the most recent fiscal year was &lt;span id="xdx_90C_err--PortfolioTurnoverRate_dU_c20240430__20240430__dei--LegalEntityAxis__custom--S000003874Member_z9C5Tqgc6N5k"&gt;35%&lt;/span&gt;.&lt;/span&gt;&lt;/p&gt;

</rr:PortfolioTurnoverTextBlock>
    <rr:PortfolioTurnoverRate
      contextRef="From2024-04-302024-04-30_custom_S000003874Member"
      decimals="INF"
      id="Fact000593"
      unitRef="Ratio">0.35</rr:PortfolioTurnoverRate>
    <rr:StrategyHeading
      contextRef="From2024-04-302024-04-30_custom_S000003874Member"
      id="Fact000594">Investments, risks, and performance</rr:StrategyHeading>
    <rr:StrategyNarrativeTextBlock
      contextRef="From2024-04-302024-04-30_custom_S000003874Member"
      id="Fact000595">&lt;p id="xdx_A82_err--StrategyNarrativeTextBlock_zk5TF17lDyv" style="font: 600 10pt/1.5 Arial, Helvetica, Sans-Serif; margin: 15px 42px 0px; color: #000000"&gt;
&lt;b&gt;Investments&lt;/b&gt;
&lt;/p&gt;

&lt;p style="font: 10pt/1.5 Arial, Helvetica, Sans-Serif; margin: 0px 42px 9px; color: #000000; font-weight: 300; text-align: left"&gt;&lt;span style="-sec-ix-redline: true"&gt;For
this non-diversified fund concentrating in the health care industries, we invest mainly in common stocks (growth or value stocks or both)
of large and midsize companies worldwide that we believe have favorable investment potential. Under normal circumstances, we invest at
least 80% of the fund&#x2019;s net&#160;assets in securities of companies in the health care industries. This policy may be changed only
after 60 days&#x2019; notice to shareholders. Potential investments include companies that manufacture health care supplies or provide
health care-related services, and companies in the research, development, production and marketing of pharmaceuticals and biotechnology
products. We may purchase stocks of companies with stock prices that reflect a value lower than that which we place on the company. We
may consider, among other factors, a company&#x2019;s valuation, financial strength, growth potential, competitive position in its industry,
projected future earnings, cash flows and dividends when deciding whether to buy or sell investments. We may also consider other factors
that we believe will cause the stock price to rise. We may also use derivatives, such as certain foreign currency transactions, futures,
options, warrants and swap contracts, for both hedging and non-hedging purposes, and may engage in short sales of securities. For example,
we typically use foreign currency forward contracts in connection with the fund&#x2019;s investments in foreign securities in order to
hedge the fund&#x2019;s currency exposure relative to the fund&#x2019;s benchmark index.&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt/1.5 Arial, Helvetica, Sans-Serif; margin: 0px 42px 9px; color: #000000; font-weight: 300; text-align: left"&gt;
The use of the term &#x201c;global&#x201d; in the fund&#x2019;s name is meant to emphasize that we look for investment opportunities on a worldwide basis and that our investment strategies are not constrained by the countries or regions in which companies are located. Under normal market conditions, the fund intends to invest in at least five different countries and at least 40% of its net&#160;assets in securities of foreign companies (or, if less, at least the percentage of net&#160;assets that is ten percentage points less than the percentage of the fund&#x2019;s benchmark represented by foreign companies, as determined by the providers of the benchmark).
&lt;/p&gt;

</rr:StrategyNarrativeTextBlock>
    <rr:RiskHeading
      contextRef="From2024-04-302024-04-30_custom_S000003874Member"
      id="Fact000596">Risks</rr:RiskHeading>
    <rr:RiskTextBlock
      contextRef="From2024-04-302024-04-30_custom_S000003874Member"
      id="Fact000597">&lt;p id="xdx_A8B_err--RiskTextBlock_z3qrtRzKDkz7" style="font: 10pt/1.5 Arial, Helvetica, Sans-Serif; margin: 0px 42px 9px; color: #000000; font-weight: 300; text-align: left"&gt;
&lt;span id="xdx_90A_err--RiskTextBlock_dU_c20240430__20240430__dei--LegalEntityAxis__custom--S000003874Member__rr--RiskAxis__rr--RiskLoseMoneyMember_zdxzcdnIRAdj"&gt;It is important to understand that you can lose money by investing in the fund.&lt;/span&gt;
&lt;/p&gt;

&lt;p style="font: 10pt/1.5 Arial, Helvetica, Sans-Serif; margin: 0px 42px 9px; color: #000000; font-weight: 300; text-align: left"&gt;&lt;span style="-sec-ix-redline: true"&gt;The
value of investments in the fund&#x2019;s portfolio may fall or fail to rise over extended periods of time for a variety of reasons, including
general economic, political or financial market conditions, investor sentiment and market perceptions, government actions, geopolitical
events or changes, outbreaks of infectious illnesses or other widespread public health issues, and factors related to a specific issuer,
geography, industry or sector. These and other factors may lead to increased volatility and reduced liquidity in the fund&#x2019;s portfolio
holdings, may negatively impact the fund&#x2019;s performance, and may exacerbate other risks to which the fund is subject. Growth stocks
may be more susceptible to earnings disappointments, and value stocks may fail to rebound. These risks are generally greater for small
and midsize companies. The health care industries may be affected by product obsolescence, dependence on patents and intellectual property
rights, expenses and losses from product liability and similar claims, changes in government programs or regulatory requirements (including
approval policies for drugs, medical devices or procedures), and pricing pressures (including as a result of increased competition, changes
in governmental and private reimbursement rates and payment systems, or other reforms).&lt;/span&gt;&lt;/p&gt;



&lt;p&gt;
&lt;br/&gt;
&lt;br/&gt;
&lt;/p&gt;

&lt;div style="border-top: Black 1pt solid; margin: 18pt auto; font-size: 1pt"&gt;&#160;&lt;/div&gt;

&lt;p&gt;&lt;br/&gt;
&lt;br/&gt;
&lt;/p&gt;

&lt;p style="font: 10pt/1.5 Arial, Helvetica, Sans-Serif; margin: 0px 42px 9px; color: #000000; font-weight: 300; text-align: left"&gt;
Our policy of concentrating on a limited group of industries and the fund&#x2019;s &#x201c;non-diversified&#x201d; status, which means the fund may invest a greater percentage of its assets in fewer issuers than a &#x201c;diversified fund,&#x201d; can increase the fund&#x2019;s vulnerability to adverse developments affecting a single industry or issuer, which may result in greater losses and volatility for the fund. The value of international investments traded in foreign currencies may be adversely impacted by fluctuations in exchange rates. International investments, particularly investments in emerging markets, may carry risks associated with potentially less stable economies or governments (such as the risk of seizure by a foreign government, the imposition of currency or other restrictions, or high levels of inflation), and may be or become illiquid.
&lt;/p&gt;

&lt;p style="font: 10pt/1.5 Arial, Helvetica, Sans-Serif; margin: 0px 42px 9px; color: #000000; font-weight: 300; text-align: left"&gt;
Our use of derivatives may increase the risks of investing in the fund by increasing investment exposure (which may be considered leverage) or, in the case of many over-the-counter instruments, because of the potential inability to terminate or sell derivative positions and the potential failure of the other party to the instrument to meet its obligations. The risk of a party failing to meet its obligations may increase if the fund has significant exposure to that counterparty. The value of derivatives may move in unexpected ways due to unanticipated market movements, the use of leverage, imperfect correlation between the derivative instrument and the reference asset, or other factors, especially in unusual market conditions, and volatility in the value of derivatives could adversely impact the fund&#x2019;s returns, obligations and exposures. Derivatives are also subject to other risks, including liquidity risk (e.g., liquidity demands arising from the requirement to make payments to a derivative counterparty), operational risk (e.g., settlement issues or system failures), and legal risk (e.g., insufficient legal documentation or contract enforceability issues). Our use of short selling may result in losses if the securities appreciate in value.
&lt;/p&gt;

&lt;p style="font: 10pt/1.5 Arial, Helvetica, Sans-Serif; margin: 0px 42px 9px; color: #000000; font-weight: 300; text-align: left"&gt;
There is no guarantee that the investment techniques, analyses, or judgments that we apply in making investment decisions for the fund will produce the intended outcome or that the investments we select for the fund will perform as well as other securities that were not selected for the fund. We, or the fund&#x2019;s other service providers, may experience disruptions or operating errors that could negatively impact the fund.
&lt;/p&gt;

&lt;p style="font: 10pt/1.5 Arial, Helvetica, Sans-Serif; margin: 0px 42px 9px; color: #000000; font-weight: 300; text-align: left"&gt;&lt;span style="-sec-ix-redline: true"&gt;The
fund may be an investment option for mutual funds that are managed by Franklin Resources, Inc. (Franklin Templeton) and its affiliates
as &#x201c;funds of funds&#x201d; and other investors with substantial investments in the fund. Such shareholders may at times be considered
to control the fund. Dispositions of a large number of shares by these shareholders may adversely affect the fund&#x2019;s liquidity and
net&#160;assets. These redemptions may also force the fund to sell securities, which may increase the fund&#x2019;s brokerage costs.&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt/1.5 Arial, Helvetica, Sans-Serif; margin: 0px 42px 9px; color: #000000; font-weight: 300; text-align: left"&gt;
The fund may not achieve its goal, and it is not intended to be a complete investment program. &lt;span id="xdx_90C_err--RiskTextBlock_dU_c20240430__20240430__dei--LegalEntityAxis__custom--S000003874Member__rr--RiskAxis__rr--RiskNotInsuredDepositoryInstitutionMember_z8yd3hyrmChe"&gt;An investment in the fund is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency.&lt;/span&gt;
&lt;/p&gt;

</rr:RiskTextBlock>
    <rr:RiskTextBlock
      contextRef="From2024-04-302024-04-30_custom_S000003874Member_rr_RiskLoseMoneyMember"
      id="Fact000598">It is important to understand that you can lose money by investing in the fund.</rr:RiskTextBlock>
    <rr:RiskTextBlock
      contextRef="From2024-04-302024-04-30_custom_S000003874Member_rr_RiskNotInsuredDepositoryInstitutionMember"
      id="Fact000600">An investment in the fund is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency.</rr:RiskTextBlock>
    <rr:BarChartAndPerformanceTableHeading
      contextRef="From2024-04-302024-04-30_custom_S000003874Member"
      id="Fact000601">Performance</rr:BarChartAndPerformanceTableHeading>
    <rr:PerformanceNarrativeTextBlock
      contextRef="From2024-04-302024-04-30_custom_S000003874Member"
      id="Fact000602">&lt;p id="xdx_A8F_err--PerformanceNarrativeTextBlock_zVUvUabNtW8l" style="font: 10pt/1.5 Arial, Helvetica, Sans-Serif; margin: 0px 42px 9px; color: #000000; font-weight: 300; text-align: left"&gt;
&lt;span id="xdx_90B_err--PerformanceInformationIllustratesVariabilityOfReturns_dU_c20240430__20240430__dei--LegalEntityAxis__custom--S000003874Member_zPiPmhMxk2Me"&gt;The performance information below gives some indication of the risks associated with an investment in the fund by showing the fund&#x2019;s performance year to year and over time.&lt;/span&gt; The performance information does not reflect insurance-related charges or expenses. If it did, performance would be lower. &lt;span id="xdx_905_err--PerformancePastDoesNotIndicateFuture_dU_c20240430__20240430__dei--LegalEntityAxis__custom--S000003874Member_zSO3M6xCQQMk"&gt;Please remember that past performance is not necessarily an indication of future results.&lt;/span&gt; 
&lt;/p&gt;

</rr:PerformanceNarrativeTextBlock>
    <rr:PerformanceInformationIllustratesVariabilityOfReturns
      contextRef="From2024-04-302024-04-30_custom_S000003874Member"
      id="Fact000603">The performance information below gives some indication of the risks associated with an investment in the fund by showing the fund&#x2019;s performance year to year and over time.</rr:PerformanceInformationIllustratesVariabilityOfReturns>
    <rr:PerformancePastDoesNotIndicateFuture
      contextRef="From2024-04-302024-04-30_custom_S000003874Member"
      id="Fact000604">Please remember that past performance is not necessarily an indication of future results.</rr:PerformancePastDoesNotIndicateFuture>
    <rr:BarChartHeading
      contextRef="From2024-04-302024-04-30_custom_S000003874Member"
      id="Fact000605">Annual total returns for class IA shares</rr:BarChartHeading>
    <rr:AnnualReturn2014
      contextRef="From2024-04-302024-04-30_custom_S000003874Member_custom_C000010843Member"
      decimals="INF"
      id="Fact000608"
      unitRef="Ratio">0.2796</rr:AnnualReturn2014>
    <rr:AnnualReturn2015
      contextRef="From2024-04-302024-04-30_custom_S000003874Member_custom_C000010843Member"
      decimals="INF"
      id="Fact000610"
      unitRef="Ratio">0.0806</rr:AnnualReturn2015>
    <rr:AnnualReturn2016
      contextRef="From2024-04-302024-04-30_custom_S000003874Member_custom_C000010843Member"
      decimals="INF"
      id="Fact000612"
      unitRef="Ratio">-0.1114</rr:AnnualReturn2016>
    <rr:AnnualReturn2017
      contextRef="From2024-04-302024-04-30_custom_S000003874Member_custom_C000010843Member"
      decimals="INF"
      id="Fact000614"
      unitRef="Ratio">0.1560</rr:AnnualReturn2017>
    <rr:AnnualReturn2018
      contextRef="From2024-04-302024-04-30_custom_S000003874Member_custom_C000010843Member"
      decimals="INF"
      id="Fact000616"
      unitRef="Ratio">-0.0029</rr:AnnualReturn2018>
    <rr:AnnualReturn2019
      contextRef="From2024-04-302024-04-30_custom_S000003874Member_custom_C000010843Member"
      decimals="INF"
      id="Fact000618"
      unitRef="Ratio">0.3058</rr:AnnualReturn2019>
    <rr:AnnualReturn2020
      contextRef="From2024-04-302024-04-30_custom_S000003874Member_custom_C000010843Member"
      decimals="INF"
      id="Fact000620"
      unitRef="Ratio">0.1647</rr:AnnualReturn2020>
    <rr:AnnualReturn2021
      contextRef="From2024-04-302024-04-30_custom_S000003874Member_custom_C000010843Member"
      decimals="INF"
      id="Fact000622"
      unitRef="Ratio">0.1977</rr:AnnualReturn2021>
    <rr:AnnualReturn2022
      contextRef="From2024-04-302024-04-30_custom_S000003874Member_custom_C000010843Member"
      decimals="INF"
      id="Fact000624"
      unitRef="Ratio">-0.0444</rr:AnnualReturn2022>
    <rr:AnnualReturn2023
      contextRef="From2024-04-302024-04-30_custom_S000003874Member_custom_C000010843Member"
      decimals="INF"
      id="Fact000626"
      unitRef="Ratio">0.0939</rr:AnnualReturn2023>
    <rr:YearToDateReturnLabel
      contextRef="From2024-04-302024-04-30_custom_S000003874Member"
      id="Fact000627">Year-to-date performance</rr:YearToDateReturnLabel>
    <rr:BarChartYearToDateReturnDate
      contextRef="From2024-04-302024-04-30_custom_S000003874Member"
      id="Fact000628">2024-03-31</rr:BarChartYearToDateReturnDate>
    <rr:BarChartYearToDateReturn
      contextRef="From2024-04-302024-04-30_custom_S000003874Member"
      decimals="INF"
      id="Fact000629"
      unitRef="Ratio">0.0881</rr:BarChartYearToDateReturn>
    <rr:HighestQuarterlyReturnLabel
      contextRef="From2024-04-302024-04-30_custom_S000003874Member"
      id="Fact000630">Best calendar quarter</rr:HighestQuarterlyReturnLabel>
    <rr:BarChartHighestQuarterlyReturnDate
      contextRef="From2024-04-302024-04-30_custom_S000003874Member"
      id="Fact000631">2019-12-31</rr:BarChartHighestQuarterlyReturnDate>
    <rr:BarChartHighestQuarterlyReturn
      contextRef="From2024-04-302024-04-30_custom_S000003874Member"
      decimals="INF"
      id="Fact000632"
      unitRef="Ratio">0.1758</rr:BarChartHighestQuarterlyReturn>
    <rr:LowestQuarterlyReturnLabel
      contextRef="From2024-04-302024-04-30_custom_S000003874Member"
      id="Fact000633">Worst calendar quarter</rr:LowestQuarterlyReturnLabel>
    <rr:BarChartLowestQuarterlyReturnDate
      contextRef="From2024-04-302024-04-30_custom_S000003874Member"
      id="Fact000634">2015-09-30</rr:BarChartLowestQuarterlyReturnDate>
    <rr:BarChartLowestQuarterlyReturn
      contextRef="From2024-04-302024-04-30_custom_S000003874Member"
      decimals="INF"
      id="Fact000635"
      unitRef="Ratio">-0.1172</rr:BarChartLowestQuarterlyReturn>
    <rr:PerformanceTableHeading
      contextRef="From2024-04-302024-04-30_custom_S000003874Member"
      id="Fact000636">Average
annual total returns

(for
periods ended 12/31/23)</rr:PerformanceTableHeading>
    <rr:AverageAnnualReturnYear01
      contextRef="From2024-04-302024-04-30_custom_S000003874Member_custom_C000010843Member"
      decimals="INF"
      id="Fact000638"
      unitRef="Ratio">0.0939</rr:AverageAnnualReturnYear01>
    <rr:AverageAnnualReturnYear05
      contextRef="From2024-04-302024-04-30_custom_S000003874Member_custom_C000010843Member"
      decimals="INF"
      id="Fact000639"
      unitRef="Ratio">0.1375</rr:AverageAnnualReturnYear05>
    <rr:AverageAnnualReturnYear10
      contextRef="From2024-04-302024-04-30_custom_S000003874Member_custom_C000010843Member"
      decimals="INF"
      id="Fact000640"
      unitRef="Ratio">0.1043</rr:AverageAnnualReturnYear10>
    <rr:AverageAnnualReturnYear01
      contextRef="From2024-04-302024-04-30_custom_S000003874Member_custom_C000010844Member"
      decimals="INF"
      id="Fact000641"
      unitRef="Ratio">0.0913</rr:AverageAnnualReturnYear01>
    <rr:AverageAnnualReturnYear05
      contextRef="From2024-04-302024-04-30_custom_S000003874Member_custom_C000010844Member"
      decimals="INF"
      id="Fact000642"
      unitRef="Ratio">0.1348</rr:AverageAnnualReturnYear05>
    <rr:AverageAnnualReturnYear10
      contextRef="From2024-04-302024-04-30_custom_S000003874Member_custom_C000010844Member"
      decimals="INF"
      id="Fact000643"
      unitRef="Ratio">0.1016</rr:AverageAnnualReturnYear10>
    <rr:AverageAnnualReturnYear01
      contextRef="From2024-04-302024-04-30_custom_S000003874Member_custom_MSCIWorldHealthCareIndexMember"
      decimals="INF"
      id="Fact000644"
      unitRef="Ratio">0.0376</rr:AverageAnnualReturnYear01>
    <rr:AverageAnnualReturnYear05
      contextRef="From2024-04-302024-04-30_custom_S000003874Member_custom_MSCIWorldHealthCareIndexMember"
      decimals="INF"
      id="Fact000645"
      unitRef="Ratio">0.1047</rr:AverageAnnualReturnYear05>
    <rr:AverageAnnualReturnYear10
      contextRef="From2024-04-302024-04-30_custom_S000003874Member_custom_MSCIWorldHealthCareIndexMember"
      decimals="INF"
      id="Fact000646"
      unitRef="Ratio">0.0901</rr:AverageAnnualReturnYear10>
    <rr:PerformanceTableClosingTextBlock
      contextRef="From2024-04-302024-04-30_custom_S000003874Member"
      id="Fact000647">&lt;div id="xdx_A8C_err--PerformanceTableClosingTextBlock_zUjEui9vulD5"&gt;&lt;/div&gt;
&lt;table style="font: 300 9pt/1.5 Arial, Helvetica, Sans-Serif; margin-left: 10px; width: 90%"&gt;
&lt;tr style="vertical-align: top"&gt;
&lt;td style="width: 25px; text-align: right"&gt;&lt;/td&gt;
&lt;td&gt;&lt;span style="-sec-ix-redline: true"&gt;All MSCI indices are provided by MSCI.&lt;/span&gt;&lt;/td&gt;

&lt;/tr&gt;
&lt;/table&gt;

&lt;table style="font: 300 9pt/1.5 Arial, Helvetica, Sans-Serif; margin-left: 10px; width: 90%"&gt;
&lt;tr style="vertical-align: top"&gt;
&lt;td style="width: 25px; text-align: right"&gt;&lt;/td&gt;
&lt;td&gt;&lt;span style="-sec-ix-redline: true"&gt;MSCI makes no warranties and shall have no liability with respect to any MSCI data reproduced herein. No further redistribution
or use is permitted. This report is not prepared or endorsed by MSCI. Important data provider notices and terms available at www.franklintempletondatasources.com.
You cannot invest directly in an index.&lt;/span&gt;&lt;/td&gt;

&lt;/tr&gt;
&lt;/table&gt;

</rr:PerformanceTableClosingTextBlock>
    <rr:RiskReturnHeading
      contextRef="From2024-04-302024-04-30_custom_S000003882Member"
      id="Fact000649">Fund summary</rr:RiskReturnHeading>
    <rr:ObjectiveHeading
      contextRef="From2024-04-302024-04-30_custom_S000003882Member"
      id="Fact000650">Goal</rr:ObjectiveHeading>
    <rr:ObjectivePrimaryTextBlock
      contextRef="From2024-04-302024-04-30_custom_S000003882Member"
      id="Fact000651">&lt;p id="xdx_A85_err--ObjectivePrimaryTextBlock_zvK7XJqeuGe" style="font: 10pt/1.5 Arial, Helvetica, Sans-Serif; margin: 0px 42px 9px; color: #000000; font-weight: 300; text-align: left"&gt;
Putnam VT Government Money Market Fund seeks as high a rate of current income as Putnam Investment Management, LLC believes is consistent with preservation of capital and maintenance of liquidity. 
&lt;/p&gt;

</rr:ObjectivePrimaryTextBlock>
    <rr:ExpenseHeading
      contextRef="From2024-04-302024-04-30_custom_S000003882Member"
      id="Fact000652">Fees and expenses</rr:ExpenseHeading>
    <rr:ExpenseNarrativeTextBlock
      contextRef="From2024-04-302024-04-30_custom_S000003882Member"
      id="Fact000653">&lt;p id="xdx_A89_err--ExpenseNarrativeTextBlock_zjqDzDdAmkz4" style="font: 10pt/1.5 Arial, Helvetica, Sans-Serif; margin: 0px 42px 9px; color: #000000; font-weight: 300; text-align: left"&gt;
The following table describes the fees and expenses you may pay if you buy, hold and sell shares of the fund. You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in the tables and examples below. The fees and expenses information does not reflect insurance-related charges or expenses borne by contract holders indirectly investing in the fund. If it did, expenses would be higher.
&lt;/p&gt;

</rr:ExpenseNarrativeTextBlock>
    <rr:OperatingExpensesCaption
      contextRef="From2024-04-302024-04-30_custom_S000003882Member"
      id="Fact000654">
Annual fund operating expenses 



(expenses you pay each year as a percentage of the value of your investment)
</rr:OperatingExpensesCaption>
    <rr:ManagementFeesOverAssets
      contextRef="From2024-04-302024-04-30_custom_S000003882Member_custom_C000010859Member"
      decimals="INF"
      id="Fact000656"
      unitRef="Ratio">0.0028</rr:ManagementFeesOverAssets>
    <rr:DistributionAndService12b1FeesOverAssets
      contextRef="From2024-04-302024-04-30_custom_S000003882Member_custom_C000010859Member"
      decimals="INF"
      id="Fact000657"
      unitRef="Ratio">0</rr:DistributionAndService12b1FeesOverAssets>
    <rr:OtherExpensesOverAssets
      contextRef="From2024-04-302024-04-30_custom_S000003882Member_custom_C000010859Member"
      decimals="INF"
      id="Fact000658"
      unitRef="Ratio">0.0019</rr:OtherExpensesOverAssets>
    <rr:ExpensesOverAssets
      contextRef="From2024-04-302024-04-30_custom_S000003882Member_custom_C000010859Member"
      decimals="INF"
      id="Fact000659"
      unitRef="Ratio">0.0047</rr:ExpensesOverAssets>
    <rr:ManagementFeesOverAssets
      contextRef="From2024-04-302024-04-30_custom_S000003882Member_custom_C000010860Member"
      decimals="INF"
      id="Fact000660"
      unitRef="Ratio">0.0028</rr:ManagementFeesOverAssets>
    <rr:DistributionAndService12b1FeesOverAssets
      contextRef="From2024-04-302024-04-30_custom_S000003882Member_custom_C000010860Member"
      decimals="INF"
      id="Fact000661"
      unitRef="Ratio">0.0025</rr:DistributionAndService12b1FeesOverAssets>
    <rr:OtherExpensesOverAssets
      contextRef="From2024-04-302024-04-30_custom_S000003882Member_custom_C000010860Member"
      decimals="INF"
      id="Fact000662"
      unitRef="Ratio">0.0019</rr:OtherExpensesOverAssets>
    <rr:ExpensesOverAssets
      contextRef="From2024-04-302024-04-30_custom_S000003882Member_custom_C000010860Member"
      decimals="INF"
      id="Fact000663"
      unitRef="Ratio">0.0072</rr:ExpensesOverAssets>
    <rr:ExpenseExampleHeading
      contextRef="From2024-04-302024-04-30_custom_S000003882Member"
      id="Fact000664">Example</rr:ExpenseExampleHeading>
    <rr:ExpenseExampleNarrativeTextBlock
      contextRef="From2024-04-302024-04-30_custom_S000003882Member"
      id="Fact000665">&lt;p id="xdx_A8B_err--ExpenseExampleNarrativeTextBlock_zH16XVgcYMh8" style="font: 10pt/1.5 Arial, Helvetica, Sans-Serif; margin: 0px 42px 9px; color: #000000; font-weight: 300; text-align: left"&gt;
The following hypothetical example is intended to help you compare the cost of investing in the fund with the cost of investing in other funds. The example does not reflect insurance-related charges or expenses. If it did, expenses would be higher. It assumes that you invest $10,000 in the fund for the time periods indicated and then redeem or hold all your shares at the end of those periods. It assumes a 5% return on your investment each year and that the fund&#x2019;s operating expenses remain the same. Your actual costs may be higher or lower.
&lt;/p&gt;

</rr:ExpenseExampleNarrativeTextBlock>
    <rr:ExpenseExampleYear01
      contextRef="From2024-04-302024-04-30_custom_S000003882Member_custom_C000010859Member"
      decimals="0"
      id="Fact000667"
      unitRef="USD">48</rr:ExpenseExampleYear01>
    <rr:ExpenseExampleYear03
      contextRef="From2024-04-302024-04-30_custom_S000003882Member_custom_C000010859Member"
      decimals="0"
      id="Fact000668"
      unitRef="USD">151</rr:ExpenseExampleYear03>
    <rr:ExpenseExampleYear05
      contextRef="From2024-04-302024-04-30_custom_S000003882Member_custom_C000010859Member"
      decimals="0"
      id="Fact000669"
      unitRef="USD">263</rr:ExpenseExampleYear05>
    <rr:ExpenseExampleYear10
      contextRef="From2024-04-302024-04-30_custom_S000003882Member_custom_C000010859Member"
      decimals="0"
      id="Fact000670"
      unitRef="USD">591</rr:ExpenseExampleYear10>
    <rr:ExpenseExampleYear01
      contextRef="From2024-04-302024-04-30_custom_S000003882Member_custom_C000010860Member"
      decimals="0"
      id="Fact000671"
      unitRef="USD">74</rr:ExpenseExampleYear01>
    <rr:ExpenseExampleYear03
      contextRef="From2024-04-302024-04-30_custom_S000003882Member_custom_C000010860Member"
      decimals="0"
      id="Fact000672"
      unitRef="USD">230</rr:ExpenseExampleYear03>
    <rr:ExpenseExampleYear05
      contextRef="From2024-04-302024-04-30_custom_S000003882Member_custom_C000010860Member"
      decimals="0"
      id="Fact000673"
      unitRef="USD">401</rr:ExpenseExampleYear05>
    <rr:ExpenseExampleYear10
      contextRef="From2024-04-302024-04-30_custom_S000003882Member_custom_C000010860Member"
      decimals="0"
      id="Fact000674"
      unitRef="USD">894</rr:ExpenseExampleYear10>
    <rr:StrategyHeading
      contextRef="From2024-04-302024-04-30_custom_S000003882Member"
      id="Fact000675">Investments, risks, and performance</rr:StrategyHeading>
    <rr:StrategyNarrativeTextBlock
      contextRef="From2024-04-302024-04-30_custom_S000003882Member"
      id="Fact000676">&lt;p id="xdx_A8E_err--StrategyNarrativeTextBlock_ze97sN1QgDHe" style="font: 600 10pt/1.5 Arial, Helvetica, Sans-Serif; margin: 15px 42px 0px; color: #000000"&gt;
&lt;b&gt;Investments&lt;/b&gt;
&lt;/p&gt;

&lt;p style="font: 10pt/1.5 Arial, Helvetica, Sans-Serif; margin: 0px 42px 9px; color: #000000; font-weight: 300; text-align: left"&gt;&lt;span style="-sec-ix-redline: true"&gt;We
invest at least 99.5 percent of the fund&#x2019;s total assets in cash, U.S. government securities and repurchase agreements that are
fully collateralized by U.S. government securities or cash. We invest mainly in debt securities that are obligations of the U.S. government,
its agencies and instrumentalities and accordingly are backed by the full faith and credit of the United States (e.g., U.S. Treasury
bills) or by the credit of a federal agency or government-sponsored entity (e.g., securities issued by Fannie Mae and Freddie Mac). The
U.S. government securities in which we invest may also include variable and floating rate instruments and when-issued and delayed delivery
securities (i.e., payment or delivery of the securities occurs at a future date for a predetermined price). Under normal circumstances,
we invest at least 80% of the fund&#x2019;s net&#160;assets in U.S. government securities and repurchase agreements that are fully collateralized
by U.S. government securities. This policy may be changed only after 60 days&#x2019; notice to shareholders. The securities purchased
by the fund are subject to quality, maturity, diversification and other requirements pursuant to rules promulgated by the Securities
and Exchange Commission. We may consider, among other factors, credit and interest rate risks and characteristics of the issuer or counterparty,
as well as general market conditions, when deciding whether to buy or sell investments.&lt;/span&gt;&lt;/p&gt;

</rr:StrategyNarrativeTextBlock>
    <rr:RiskHeading
      contextRef="From2024-04-302024-04-30_custom_S000003882Member"
      id="Fact000677">Risks</rr:RiskHeading>
    <rr:RiskTextBlock
      contextRef="From2024-04-302024-04-30_custom_S000003882Member"
      id="Fact000678">&lt;p id="xdx_A84_err--RiskTextBlock_z4bFlwsuvwha" style="font: 10pt/1.5 Arial, Helvetica, Sans-Serif; margin: 0px 42px 9px; color: #000000; font-weight: 300; text-align: left"&gt;
The value of investments in the fund&#x2019;s portfolio may fall or fail to rise over extended periods of time for a variety of reasons, including general economic, political or financial market conditions, investor sentiment and market perceptions, government actions, geopolitical events or changes, outbreaks of infectious illnesses or other widespread public health issues, and factors related to a specific issuer, geography, industry or sector. These and other factors may lead to increased volatility and reduced liquidity in the fund&#x2019;s portfolio holdings, may negatively impact the fund&#x2019;s performance, and may exacerbate other risks to which the fund is subject.
&lt;/p&gt;

&lt;p style="font: 10pt/1.5 Arial, Helvetica, Sans-Serif; margin: 0px 42px 9px; color: #000000; font-weight: 300; text-align: left"&gt;
The values of money market investments usually rise and fall in response to changes in interest rates. Interest rate risk is generally lowest for investments with short maturities (a significant part of the fund&#x2019;s investments). Changes in the financial condition of an issuer or counterparty, changes in specific economic or political conditions that affect a particular type of issuer, and changes in general economic or political conditions can increase the risk of default by an issuer or counterparty, which can affect a security&#x2019;s or instrument&#x2019;s credit quality or value. Certain securities in which the fund may invest, including securities issued by certain U.S. government agencies and U.S. government sponsored enterprises, are not guaranteed by the U.S. government or supported by the full faith and credit of the United States.
&lt;/p&gt;

&lt;p style="font: 10pt/1.5 Arial, Helvetica, Sans-Serif; margin: 0px 42px 9px; color: #000000; font-weight: 300; text-align: left"&gt;
There is no guarantee that the investment techniques, analyses, or judgments that we apply in making investment decisions for the fund will produce the intended outcome or that the investments we select for the fund will perform as well as other securities that were not selected for the fund. We, or the fund&#x2019;s other service providers, may experience disruptions or operating errors that could negatively impact the fund.
&lt;/p&gt;

&lt;p style="font: 10pt/1.5 Arial, Helvetica, Sans-Serif; margin: 0px 42px 9px; color: #000000; font-weight: 300; text-align: left"&gt;&lt;span style="-sec-ix-redline: true"&gt;The
fund may be an investment option for mutual funds that are managed by Franklin Resources, Inc. (Franklin Templeton) and its affiliates
as &#x201c;funds of funds&#x201d; and other investors with substantial investments in the fund. Such shareholders may at times be considered
to control the fund. Dispositions of a large number of shares by these shareholders may adversely affect the fund&#x2019;s liquidity and
net&#160;assets. These redemptions may also force the fund to sell securities, which may increase the fund&#x2019;s brokerage costs.&lt;/span&gt;&lt;/p&gt;



&lt;p&gt;
&lt;br/&gt;
&lt;br/&gt;
&lt;/p&gt;

&lt;div style="border-top: Black 1pt solid; margin: 18pt auto; font-size: 1pt"&gt;&#160;&lt;/div&gt;

&lt;p&gt;&lt;br/&gt;
&lt;br/&gt;
&lt;/p&gt;

&lt;p style="font: 10pt/1.5 Arial, Helvetica, Sans-Serif; margin: 0px 42px 9px; color: #000000; font-weight: 300; text-align: left"&gt;
The fund may not achieve its goal, and is not intended to be a complete investment program. &lt;span id="xdx_907_err--RiskTextBlock_dU_c20240430__20240430__dei--LegalEntityAxis__custom--S000003882Member__rr--RiskAxis__rr--RiskLoseMoneyMember_z91r2vdGQxs2"&gt;You could lose money by investing in the fund.&lt;/span&gt; &lt;span id="xdx_90E_err--RiskTextBlock_dU_c20240430__20240430__dei--LegalEntityAxis__custom--S000003882Member__rr--RiskAxis__rr--RiskMoneyMarketFundMayNotPreserveDollarMember_zUElRR11EFzi"&gt;Although the fund seeks to preserve the value of your investment at $1.00 per share, it cannot guarantee it will do so&lt;/span&gt;. &lt;span id="xdx_904_err--RiskTextBlock_dU_c20240430__20240430__dei--LegalEntityAxis__custom--S000003882Member__rr--RiskAxis__rr--RiskNotInsuredDepositoryInstitutionMember_zVOiNWZtLU2c"&gt;An investment in the fund is not a bank account and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency.&lt;/span&gt; &lt;span id="xdx_90D_err--RiskTextBlock_dU_c20240430__20240430__dei--LegalEntityAxis__custom--S000003882Member__rr--RiskAxis__rr--RiskMoneyMarketFundSponsorMayNotProvideSupportMember_zNlmqqclZgv1"&gt;The fund&#x2019;s sponsor is not required to reimburse the fund for losses, and you should not expect that the sponsor will provide financial support to the fund at any time, including during periods of market stress.
&lt;/span&gt;&lt;/p&gt;

</rr:RiskTextBlock>
    <rr:RiskTextBlock
      contextRef="From2024-04-302024-04-30_custom_S000003882Member_rr_RiskLoseMoneyMember"
      id="Fact000680">You could lose money by investing in the fund.</rr:RiskTextBlock>
    <rr:RiskTextBlock
      contextRef="From2024-04-302024-04-30_custom_S000003882Member_rr_RiskMoneyMarketFundMayNotPreserveDollarMember"
      id="Fact000681">Although the fund seeks to preserve the value of your investment at $1.00 per share, it cannot guarantee it will do so</rr:RiskTextBlock>
    <rr:RiskTextBlock
      contextRef="From2024-04-302024-04-30_custom_S000003882Member_rr_RiskNotInsuredDepositoryInstitutionMember"
      id="Fact000682">An investment in the fund is not a bank account and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency.</rr:RiskTextBlock>
    <rr:RiskTextBlock
      contextRef="From2024-04-302024-04-30_custom_S000003882Member_rr_RiskMoneyMarketFundSponsorMayNotProvideSupportMember"
      id="Fact000683">The fund&#x2019;s sponsor is not required to reimburse the fund for losses, and you should not expect that the sponsor will provide financial support to the fund at any time, including during periods of market stress.
</rr:RiskTextBlock>
    <rr:BarChartAndPerformanceTableHeading
      contextRef="From2024-04-302024-04-30_custom_S000003882Member"
      id="Fact000684">Performance</rr:BarChartAndPerformanceTableHeading>
    <rr:PerformanceNarrativeTextBlock
      contextRef="From2024-04-302024-04-30_custom_S000003882Member"
      id="Fact000685">&lt;p id="xdx_A83_err--PerformanceNarrativeTextBlock_zL5qpQTixO8e" style="font: 10pt/1.5 Arial, Helvetica, Sans-Serif; margin: 0px 42px 9px; color: #000000; font-weight: 300; text-align: left"&gt;
&lt;span id="xdx_900_err--PerformanceInformationIllustratesVariabilityOfReturns_dU_c20240430__20240430__dei--LegalEntityAxis__custom--S000003882Member_zYBKZfMgT3y5"&gt;The performance information below gives some indication of the risks associated with an investment in the fund by showing the fund&#x2019;s performance year to year and over time.&lt;/span&gt; &lt;span id="xdx_90B_err--PerformancePastDoesNotIndicateFuture_dU_c20240430__20240430__dei--LegalEntityAxis__custom--S000003882Member_zhW28zXCffjc"&gt;Please remember that past performance is not necessarily an indication of future results.
&lt;/span&gt;&lt;/p&gt;

</rr:PerformanceNarrativeTextBlock>
    <rr:PerformanceInformationIllustratesVariabilityOfReturns
      contextRef="From2024-04-302024-04-30_custom_S000003882Member"
      id="Fact000686">The performance information below gives some indication of the risks associated with an investment in the fund by showing the fund&#x2019;s performance year to year and over time.</rr:PerformanceInformationIllustratesVariabilityOfReturns>
    <rr:PerformancePastDoesNotIndicateFuture
      contextRef="From2024-04-302024-04-30_custom_S000003882Member"
      id="Fact000687">Please remember that past performance is not necessarily an indication of future results.</rr:PerformancePastDoesNotIndicateFuture>
    <rr:BarChartHeading
      contextRef="From2024-04-302024-04-30_custom_S000003882Member"
      id="Fact000688">Annual total returns for class IA shares</rr:BarChartHeading>
    <rr:AnnualReturn2014
      contextRef="From2024-04-302024-04-30_custom_S000003882Member_custom_C000010859Member"
      decimals="INF"
      id="Fact000691"
      unitRef="Ratio">0.0001</rr:AnnualReturn2014>
    <rr:AnnualReturn2015
      contextRef="From2024-04-302024-04-30_custom_S000003882Member_custom_C000010859Member"
      decimals="INF"
      id="Fact000693"
      unitRef="Ratio">0.0001</rr:AnnualReturn2015>
    <rr:AnnualReturn2016
      contextRef="From2024-04-302024-04-30_custom_S000003882Member_custom_C000010859Member"
      decimals="INF"
      id="Fact000695"
      unitRef="Ratio">0.0001</rr:AnnualReturn2016>
    <rr:AnnualReturn2017
      contextRef="From2024-04-302024-04-30_custom_S000003882Member_custom_C000010859Member"
      decimals="INF"
      id="Fact000697"
      unitRef="Ratio">0.0047</rr:AnnualReturn2017>
    <rr:AnnualReturn2018
      contextRef="From2024-04-302024-04-30_custom_S000003882Member_custom_C000010859Member"
      decimals="INF"
      id="Fact000699"
      unitRef="Ratio">0.0143</rr:AnnualReturn2018>
    <rr:AnnualReturn2019
      contextRef="From2024-04-302024-04-30_custom_S000003882Member_custom_C000010859Member"
      decimals="INF"
      id="Fact000701"
      unitRef="Ratio">0.0181</rr:AnnualReturn2019>
    <rr:AnnualReturn2020
      contextRef="From2024-04-302024-04-30_custom_S000003882Member_custom_C000010859Member"
      decimals="INF"
      id="Fact000703"
      unitRef="Ratio">0.0024</rr:AnnualReturn2020>
    <rr:AnnualReturn2021
      contextRef="From2024-04-302024-04-30_custom_S000003882Member_custom_C000010859Member"
      decimals="INF"
      id="Fact000705"
      unitRef="Ratio">0.0001</rr:AnnualReturn2021>
    <rr:AnnualReturn2022
      contextRef="From2024-04-302024-04-30_custom_S000003882Member_custom_C000010859Member"
      decimals="INF"
      id="Fact000707"
      unitRef="Ratio">0.0129</rr:AnnualReturn2022>
    <rr:AnnualReturn2023
      contextRef="From2024-04-302024-04-30_custom_S000003882Member_custom_C000010859Member"
      decimals="INF"
      id="Fact000709"
      unitRef="Ratio">0.0470</rr:AnnualReturn2023>
    <rr:YearToDateReturnLabel
      contextRef="From2024-04-302024-04-30_custom_S000003882Member"
      id="Fact000710">Year-to-date performance
through</rr:YearToDateReturnLabel>
    <rr:BarChartYearToDateReturnDate
      contextRef="From2024-04-302024-04-30_custom_S000003882Member"
      id="Fact000711">2024-03-31</rr:BarChartYearToDateReturnDate>
    <rr:BarChartYearToDateReturn
      contextRef="From2024-04-302024-04-30_custom_S000003882Member"
      decimals="INF"
      id="Fact000712"
      unitRef="Ratio">0.0124</rr:BarChartYearToDateReturn>
    <rr:HighestQuarterlyReturnLabel
      contextRef="From2024-04-302024-04-30_custom_S000003882Member"
      id="Fact000713">Best calendar quarter</rr:HighestQuarterlyReturnLabel>
    <rr:BarChartHighestQuarterlyReturnDate
      contextRef="From2024-04-302024-04-30_custom_S000003882Member"
      id="Fact000714">2023-12-31</rr:BarChartHighestQuarterlyReturnDate>
    <rr:BarChartHighestQuarterlyReturn
      contextRef="From2024-04-302024-04-30_custom_S000003882Member"
      decimals="INF"
      id="Fact000715"
      unitRef="Ratio">0.0124</rr:BarChartHighestQuarterlyReturn>
    <rr:LowestQuarterlyReturnLabel
      contextRef="From2024-04-302024-04-30_custom_S000003882Member"
      id="Fact000716">Worst calendar quarter</rr:LowestQuarterlyReturnLabel>
    <rr:BarChartLowestQuarterlyReturnDate
      contextRef="From2024-04-302024-04-30_custom_S000003882Member"
      id="Fact000717">2022-03-31</rr:BarChartLowestQuarterlyReturnDate>
    <rr:BarChartLowestQuarterlyReturn
      contextRef="From2024-04-302024-04-30_custom_S000003882Member"
      decimals="INF"
      id="Fact000718"
      unitRef="Ratio">0.0000</rr:BarChartLowestQuarterlyReturn>
    <rr:PerformanceTableHeading
      contextRef="From2024-04-302024-04-30_custom_S000003882Member"
      id="Fact000719">Average
annual total returns

(for
periods ended 12/31/23)</rr:PerformanceTableHeading>
    <rr:AverageAnnualReturnYear01
      contextRef="From2024-04-302024-04-30_custom_S000003882Member_custom_C000010859Member"
      decimals="INF"
      id="Fact000721"
      unitRef="Ratio">0.0470</rr:AverageAnnualReturnYear01>
    <rr:AverageAnnualReturnYear05
      contextRef="From2024-04-302024-04-30_custom_S000003882Member_custom_C000010859Member"
      decimals="INF"
      id="Fact000722"
      unitRef="Ratio">0.0160</rr:AverageAnnualReturnYear05>
    <rr:AverageAnnualReturnYear10
      contextRef="From2024-04-302024-04-30_custom_S000003882Member_custom_C000010859Member"
      decimals="INF"
      id="Fact000723"
      unitRef="Ratio">0.0099</rr:AverageAnnualReturnYear10>
    <rr:AverageAnnualReturnYear01
      contextRef="From2024-04-302024-04-30_custom_S000003882Member_custom_C000010860Member"
      decimals="INF"
      id="Fact000724"
      unitRef="Ratio">0.0444</rr:AverageAnnualReturnYear01>
    <rr:AverageAnnualReturnYear05
      contextRef="From2024-04-302024-04-30_custom_S000003882Member_custom_C000010860Member"
      decimals="INF"
      id="Fact000725"
      unitRef="Ratio">0.0145</rr:AverageAnnualReturnYear05>
    <rr:AverageAnnualReturnYear10
      contextRef="From2024-04-302024-04-30_custom_S000003882Member_custom_C000010860Member"
      decimals="INF"
      id="Fact000726"
      unitRef="Ratio">0.0087</rr:AverageAnnualReturnYear10>
    <rr:RiskReturnHeading
      contextRef="From2024-04-302024-04-30_custom_S000003875Member"
      id="Fact000728">Fund summary</rr:RiskReturnHeading>
    <rr:ObjectiveHeading
      contextRef="From2024-04-302024-04-30_custom_S000003875Member"
      id="Fact000729">Goal</rr:ObjectiveHeading>
    <rr:ObjectivePrimaryTextBlock
      contextRef="From2024-04-302024-04-30_custom_S000003875Member"
      id="Fact000730">&lt;p id="xdx_A8F_err--ObjectivePrimaryTextBlock_zdvf1e2Y3Vi5" style="font: 10pt/1.5 Arial, Helvetica, Sans-Serif; margin: 0px 42px 9px; color: #000000; font-weight: 300; text-align: left"&gt;
Putnam VT High Yield Fund seeks high current income. Capital growth is a secondary goal when consistent with achieving high current income.
&lt;/p&gt;

</rr:ObjectivePrimaryTextBlock>
    <rr:ExpenseHeading
      contextRef="From2024-04-302024-04-30_custom_S000003875Member"
      id="Fact000731">Fees and expenses</rr:ExpenseHeading>
    <rr:ExpenseNarrativeTextBlock
      contextRef="From2024-04-302024-04-30_custom_S000003875Member"
      id="Fact000732">&lt;p id="xdx_A8E_err--ExpenseNarrativeTextBlock_zwUhG6muYkTb" style="font: 10pt/1.5 Arial, Helvetica, Sans-Serif; margin: 0px 42px 9px; color: #000000; font-weight: 300; text-align: left"&gt;
The following table describes the fees and expenses you may pay if you buy, hold and sell shares of the fund. You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in the tables and examples below. The fees and expenses information does not reflect insurance-related charges or expenses borne by contract holders indirectly investing in the fund. If it did, expenses would be higher.
&lt;/p&gt;

</rr:ExpenseNarrativeTextBlock>
    <rr:OperatingExpensesCaption
      contextRef="From2024-04-302024-04-30_custom_S000003875Member"
      id="Fact000733">
Annual fund operating expenses



(expenses you pay each year as a percentage of the value of your investment)
</rr:OperatingExpensesCaption>
    <rr:ManagementFeesOverAssets
      contextRef="From2024-04-302024-04-30_custom_S000003875Member_custom_C000010845Member"
      decimals="INF"
      id="Fact000735"
      unitRef="Ratio">0.0056</rr:ManagementFeesOverAssets>
    <rr:DistributionAndService12b1FeesOverAssets
      contextRef="From2024-04-302024-04-30_custom_S000003875Member_custom_C000010845Member"
      decimals="INF"
      id="Fact000736"
      unitRef="Ratio">0</rr:DistributionAndService12b1FeesOverAssets>
    <rr:OtherExpensesOverAssets
      contextRef="From2024-04-302024-04-30_custom_S000003875Member_custom_C000010845Member"
      decimals="INF"
      id="Fact000737"
      unitRef="Ratio">0.0019</rr:OtherExpensesOverAssets>
    <rr:ExpensesOverAssets
      contextRef="From2024-04-302024-04-30_custom_S000003875Member_custom_C000010845Member"
      decimals="INF"
      id="Fact000738"
      unitRef="Ratio">0.0075</rr:ExpensesOverAssets>
    <rr:ManagementFeesOverAssets
      contextRef="From2024-04-302024-04-30_custom_S000003875Member_custom_C000010846Member"
      decimals="INF"
      id="Fact000739"
      unitRef="Ratio">0.0056</rr:ManagementFeesOverAssets>
    <rr:DistributionAndService12b1FeesOverAssets
      contextRef="From2024-04-302024-04-30_custom_S000003875Member_custom_C000010846Member"
      decimals="INF"
      id="Fact000740"
      unitRef="Ratio">0.0025</rr:DistributionAndService12b1FeesOverAssets>
    <rr:OtherExpensesOverAssets
      contextRef="From2024-04-302024-04-30_custom_S000003875Member_custom_C000010846Member"
      decimals="INF"
      id="Fact000741"
      unitRef="Ratio">0.0019</rr:OtherExpensesOverAssets>
    <rr:ExpensesOverAssets
      contextRef="From2024-04-302024-04-30_custom_S000003875Member_custom_C000010846Member"
      decimals="INF"
      id="Fact000742"
      unitRef="Ratio">0.0100</rr:ExpensesOverAssets>
    <rr:ExpenseExampleHeading
      contextRef="From2024-04-302024-04-30_custom_S000003875Member"
      id="Fact000743">Example</rr:ExpenseExampleHeading>
    <rr:ExpenseExampleNarrativeTextBlock
      contextRef="From2024-04-302024-04-30_custom_S000003875Member"
      id="Fact000744">&lt;p id="xdx_A86_err--ExpenseExampleNarrativeTextBlock_zBFNjkZlcHm5" style="font: 10pt/1.5 Arial, Helvetica, Sans-Serif; margin: 0px 42px 9px; color: #000000; font-weight: 300; text-align: left"&gt;
The following hypothetical example is intended to help you compare the cost of investing in the fund with the cost of investing in other funds. The example does not reflect insurance-related charges or expenses. If it did, expenses would be higher. It assumes that you invest $10,000 in the fund for the time periods indicated and then redeem or hold all your shares at the end of those periods. It assumes a 5% return on your investment each year and that the fund&#x2019;s operating expenses remain the same. Your actual costs may be higher or lower.
&lt;/p&gt;

</rr:ExpenseExampleNarrativeTextBlock>
    <rr:ExpenseExampleYear01
      contextRef="From2024-04-302024-04-30_custom_S000003875Member_custom_C000010845Member"
      decimals="0"
      id="Fact000746"
      unitRef="USD">77</rr:ExpenseExampleYear01>
    <rr:ExpenseExampleYear03
      contextRef="From2024-04-302024-04-30_custom_S000003875Member_custom_C000010845Member"
      decimals="0"
      id="Fact000747"
      unitRef="USD">240</rr:ExpenseExampleYear03>
    <rr:ExpenseExampleYear05
      contextRef="From2024-04-302024-04-30_custom_S000003875Member_custom_C000010845Member"
      decimals="0"
      id="Fact000748"
      unitRef="USD">417</rr:ExpenseExampleYear05>
    <rr:ExpenseExampleYear10
      contextRef="From2024-04-302024-04-30_custom_S000003875Member_custom_C000010845Member"
      decimals="0"
      id="Fact000749"
      unitRef="USD">930</rr:ExpenseExampleYear10>
    <rr:ExpenseExampleYear01
      contextRef="From2024-04-302024-04-30_custom_S000003875Member_custom_C000010846Member"
      decimals="0"
      id="Fact000750"
      unitRef="USD">102</rr:ExpenseExampleYear01>
    <rr:ExpenseExampleYear03
      contextRef="From2024-04-302024-04-30_custom_S000003875Member_custom_C000010846Member"
      decimals="0"
      id="Fact000751"
      unitRef="USD">318</rr:ExpenseExampleYear03>
    <rr:ExpenseExampleYear05
      contextRef="From2024-04-302024-04-30_custom_S000003875Member_custom_C000010846Member"
      decimals="0"
      id="Fact000752"
      unitRef="USD">552</rr:ExpenseExampleYear05>
    <rr:ExpenseExampleYear10
      contextRef="From2024-04-302024-04-30_custom_S000003875Member_custom_C000010846Member"
      decimals="0"
      id="Fact000753"
      unitRef="USD">1225</rr:ExpenseExampleYear10>
    <rr:PortfolioTurnoverHeading
      contextRef="From2024-04-302024-04-30_custom_S000003875Member"
      id="Fact000754">Portfolio turnover</rr:PortfolioTurnoverHeading>
    <rr:PortfolioTurnoverTextBlock
      contextRef="From2024-04-302024-04-30_custom_S000003875Member"
      id="Fact000755">&lt;p id="xdx_A8F_err--PortfolioTurnoverTextBlock_zojv838dHF8b" style="font: 10pt/1.5 Arial, Helvetica, Sans-Serif; margin: 0px 42px 9px; color: #000000; font-weight: 300; text-align: left"&gt;&lt;span style="-sec-ix-redline: true"&gt;The
fund pays transaction-related costs, such as commissions, when it buys and sells securities (or &#x201c;turns over&#x201d; its portfolio).
A higher turnover rate may indicate higher transaction costs. These costs, which are not reflected in annual fund operating expenses
or the above example, affect fund performance. The fund&#x2019;s turnover rate in the most recent fiscal year was &lt;span id="xdx_900_err--PortfolioTurnoverRate_dU_c20240430__20240430__dei--LegalEntityAxis__custom--S000003875Member_zKxDgJRdz01b"&gt;45%&lt;/span&gt;.&lt;/span&gt;&lt;/p&gt;

</rr:PortfolioTurnoverTextBlock>
    <rr:PortfolioTurnoverRate
      contextRef="From2024-04-302024-04-30_custom_S000003875Member"
      decimals="INF"
      id="Fact000756"
      unitRef="Ratio">0.45</rr:PortfolioTurnoverRate>
    <rr:StrategyHeading
      contextRef="From2024-04-302024-04-30_custom_S000003875Member"
      id="Fact000757">Investments, risks, and performance</rr:StrategyHeading>
    <rr:StrategyNarrativeTextBlock
      contextRef="From2024-04-302024-04-30_custom_S000003875Member"
      id="Fact000758">&lt;p id="xdx_A8E_err--StrategyNarrativeTextBlock_z4eSrVIMC482" style="font: 600 10pt/1.5 Arial, Helvetica, Sans-Serif; margin: 15px 42px 0px; color: #000000"&gt;
&lt;b&gt;Investments&lt;/b&gt;
&lt;/p&gt;

&lt;p style="font: 10pt/1.5 Arial, Helvetica, Sans-Serif; margin: 0px 42px 9px; color: #000000; font-weight: 300; text-align: left"&gt;&lt;span style="-sec-ix-redline: true"&gt;We
invest mainly in bonds that are obligations of U.S. companies, are below investment-grade in quality (sometimes referred to as &#x201c;junk
bonds&#x201d;), and have intermediate- to long-term maturities (three years or longer). Under normal circumstances, we invest at least
80% of the fund&#x2019;s net&#160;assets in securities rated below investment-grade. This policy may be changed only after 60 days&#x2019;
notice to shareholders. We may also invest in other debt instruments, including loans.&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt/1.5 Arial, Helvetica, Sans-Serif; margin: 0px 42px 9px; color: #000000; font-weight: 300; text-align: left"&gt;&lt;span style="-sec-ix-redline: true"&gt;We
may consider, among other factors, credit, interest rate and prepayment risks, as well as general market conditions, when deciding whether
to buy or sell investments. We may also use derivatives, such as futures, options, certain foreign currency transactions, total return,
interest rate and credit default swap contracts, for both hedging and non-hedging purposes.&lt;/span&gt;&lt;/p&gt;

</rr:StrategyNarrativeTextBlock>
    <rr:RiskHeading
      contextRef="From2024-04-302024-04-30_custom_S000003875Member"
      id="Fact000759">Risks</rr:RiskHeading>
    <rr:RiskTextBlock
      contextRef="From2024-04-302024-04-30_custom_S000003875Member"
      id="Fact000760">&lt;p id="xdx_A8C_err--RiskTextBlock_zOKgQn2mfEf9" style="font: 10pt/1.5 Arial, Helvetica, Sans-Serif; margin: 0px 42px 9px; color: #000000; font-weight: 300; text-align: left"&gt;
&lt;span id="xdx_90D_err--RiskTextBlock_dU_c20240430__20240430__dei--LegalEntityAxis__custom--S000003875Member__rr--RiskAxis__rr--RiskLoseMoneyMember_z2i2agss7bEj"&gt;It is important to understand that you can lose money by investing in the fund.&lt;/span&gt;
&lt;/p&gt;

&lt;p style="font: 10pt/1.5 Arial, Helvetica, Sans-Serif; margin: 0px 42px 9px; color: #000000; font-weight: 300; text-align: left"&gt;
The value of investments in the fund&#x2019;s portfolio may fall or fail to rise over extended periods of time for a variety of reasons, including general economic, political or financial market conditions, investor sentiment and market perceptions, government actions, geopolitical events or changes, outbreaks of infectious illnesses or other widespread public health issues, and factors related to a specific issuer, geography, industry, or sector. These and other factors may lead to increased volatility and reduced liquidity in the fund&#x2019;s portfolio holdings, may negatively impact the fund&#x2019;s performance, and may exacerbate other risks to which the fund is subject.
&lt;/p&gt;

&lt;p style="font: 10pt/1.5 Arial, Helvetica, Sans-Serif; margin: 0px 42px 9px; color: #000000; font-weight: 300; text-align: left"&gt;
The risks associated with bond investments include interest rate risk, which is the risk that the value of the fund&#x2019;s investments is likely to fall if interest rates rise. Bond investments are also subject to credit risk, which is the risk that the issuer of a bond may default on payment of interest or principal. Bond investments may be more susceptible to downgrades or defaults during economic downturns or other periods of economic stress. Interest rate risk is generally greater for longer-term bonds, and credit risk is generally greater for below-investment-grade bonds (a significant part of the fund&#x2019;s investments), which can be more sensitive to changes in markets, credit conditions, and interest rates, and may be considered speculative.
&lt;/p&gt;

&lt;p style="font: 10pt/1.5 Arial, Helvetica, Sans-Serif; margin: 0px 42px 9px; color: #000000; font-weight: 300; text-align: left"&gt;&lt;span style="-sec-ix-redline: true"&gt;Our
use of derivatives may increase the risks of investing in the fund by increasing investment exposure (which may be considered leverage)
or, in the case of many over-the-counter instruments, because of the potential inability to terminate or sell derivative positions and
the potential failure of the other party to the instrument to meet its obligations. The risk of a party failing to meet its obligations
may increase if the fund has significant exposure to that counterparty. The value of derivatives may move in unexpected ways due to unanticipated
market movements, the use of leverage, imperfect correlation between the derivative instrument and the reference asset, or other factors,
especially in unusual market conditions, and volatility in the value of derivatives could adversely impact the fund&#x2019;s returns,
obligations and exposures. Derivatives are also subject to other risks, including liquidity risk (e.g., liquidity demands arising from
the requirement to make payments to a derivative counterparty),&lt;/span&gt;&lt;/p&gt;



&lt;p&gt;
&lt;br/&gt;
&lt;br/&gt;
&lt;/p&gt;

&lt;div style="border-top: Black 1pt solid; margin: 18pt auto; font-size: 1pt"&gt;&#160;&lt;/div&gt;

&lt;p&gt;&lt;br/&gt;
&lt;br/&gt;
&lt;/p&gt;

&lt;p style="font: 10pt/1.5 Arial, Helvetica, Sans-Serif; margin: 0px 42px 9px; color: #000000; font-weight: 300; text-align: left"&gt;&lt;span style="-sec-ix-redline: true"&gt;operational
risk (e.g., settlement issues or system failures), and legal risk (e.g., insufficient legal documentation or contract enforceability
issues).&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt/1.5 Arial, Helvetica, Sans-Serif; margin: 0px 42px 9px; color: #000000; font-weight: 300; text-align: left"&gt;
There is no guarantee that the investment techniques, analyses, or judgments that we apply in making investment decisions for the fund will produce the intended outcome or that the investments we select for the fund will perform as well as other securities that were not selected for the fund. We, or the fund&#x2019;s other service providers, may experience disruptions or operating errors that could negatively impact the fund. 
&lt;/p&gt;

&lt;p style="font: 10pt/1.5 Arial, Helvetica, Sans-Serif; margin: 0px 42px 9px; color: #000000; font-weight: 300; text-align: left"&gt;&lt;span style="-sec-ix-redline: true"&gt;The
fund may be an investment option for mutual funds that are managed by Franklin Resources, Inc. (Franklin Templeton) and its affiliates
as &#x201c;funds of funds&#x201d; and other investors with substantial investments in the fund. Such shareholders may at times be considered
to control the fund. Dispositions of a large number of shares by these shareholders may adversely affect the fund&#x2019;s liquidity and
net&#160;assets. These redemptions may also force the fund to sell securities, which may increase the fund&#x2019;s brokerage costs.&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt/1.5 Arial, Helvetica, Sans-Serif; margin: 0px 42px 9px; color: #000000; font-weight: 300; text-align: left"&gt;
The fund may not achieve its goal, and it is not intended to be a complete investment program. &lt;span id="xdx_903_err--RiskTextBlock_dU_c20240430__20240430__dei--LegalEntityAxis__custom--S000003875Member__rr--RiskAxis__rr--RiskNotInsuredDepositoryInstitutionMember_zDWMZOeqGCme"&gt;An investment in the fund is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency.&lt;/span&gt;
&lt;/p&gt;

</rr:RiskTextBlock>
    <rr:RiskTextBlock
      contextRef="From2024-04-302024-04-30_custom_S000003875Member_rr_RiskLoseMoneyMember"
      id="Fact000761">It is important to understand that you can lose money by investing in the fund.</rr:RiskTextBlock>
    <rr:RiskTextBlock
      contextRef="From2024-04-302024-04-30_custom_S000003875Member_rr_RiskNotInsuredDepositoryInstitutionMember"
      id="Fact000763">An investment in the fund is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency.</rr:RiskTextBlock>
    <rr:BarChartAndPerformanceTableHeading
      contextRef="From2024-04-302024-04-30_custom_S000003875Member"
      id="Fact000764">Performance</rr:BarChartAndPerformanceTableHeading>
    <rr:PerformanceNarrativeTextBlock
      contextRef="From2024-04-302024-04-30_custom_S000003875Member"
      id="Fact000765">&lt;p id="xdx_A82_err--PerformanceNarrativeTextBlock_zvNqpEzyEjj7" style="font: 10pt/1.5 Arial, Helvetica, Sans-Serif; margin: 0px 42px 9px; color: #000000; font-weight: 300; text-align: left"&gt;
&lt;span id="xdx_90B_err--PerformanceInformationIllustratesVariabilityOfReturns_dU_c20240430__20240430__dei--LegalEntityAxis__custom--S000003875Member_zRI1VXk3Pue1"&gt;The performance information below gives some indication of the risks associated with an investment in the fund by showing the fund&#x2019;s performance year to year and over time.&lt;/span&gt; The performance information does not reflect insurance-related charges or expenses. If it did, performance would be lower. &lt;span id="xdx_90D_err--PerformancePastDoesNotIndicateFuture_dU_c20240430__20240430__dei--LegalEntityAxis__custom--S000003875Member_zlU82ScwhuQf"&gt;Please remember that past performance is not necessarily an indication of future results.&lt;/span&gt;  
&lt;/p&gt;

</rr:PerformanceNarrativeTextBlock>
    <rr:PerformanceInformationIllustratesVariabilityOfReturns
      contextRef="From2024-04-302024-04-30_custom_S000003875Member"
      id="Fact000766">The performance information below gives some indication of the risks associated with an investment in the fund by showing the fund&#x2019;s performance year to year and over time.</rr:PerformanceInformationIllustratesVariabilityOfReturns>
    <rr:PerformancePastDoesNotIndicateFuture
      contextRef="From2024-04-302024-04-30_custom_S000003875Member"
      id="Fact000767">Please remember that past performance is not necessarily an indication of future results.</rr:PerformancePastDoesNotIndicateFuture>
    <rr:BarChartHeading
      contextRef="From2024-04-302024-04-30_custom_S000003875Member"
      id="Fact000768">Annual total returns for class IA shares</rr:BarChartHeading>
    <rr:AnnualReturn2014
      contextRef="From2024-04-302024-04-30_custom_S000003875Member_custom_C000010845Member"
      decimals="INF"
      id="Fact000771"
      unitRef="Ratio">0.0191</rr:AnnualReturn2014>
    <rr:AnnualReturn2015
      contextRef="From2024-04-302024-04-30_custom_S000003875Member_custom_C000010845Member"
      decimals="INF"
      id="Fact000773"
      unitRef="Ratio">-0.0514</rr:AnnualReturn2015>
    <rr:AnnualReturn2016
      contextRef="From2024-04-302024-04-30_custom_S000003875Member_custom_C000010845Member"
      decimals="INF"
      id="Fact000775"
      unitRef="Ratio">0.1566</rr:AnnualReturn2016>
    <rr:AnnualReturn2017
      contextRef="From2024-04-302024-04-30_custom_S000003875Member_custom_C000010845Member"
      decimals="INF"
      id="Fact000777"
      unitRef="Ratio">0.0722</rr:AnnualReturn2017>
    <rr:AnnualReturn2018
      contextRef="From2024-04-302024-04-30_custom_S000003875Member_custom_C000010845Member"
      decimals="INF"
      id="Fact000779"
      unitRef="Ratio">-0.0359</rr:AnnualReturn2018>
    <rr:AnnualReturn2019
      contextRef="From2024-04-302024-04-30_custom_S000003875Member_custom_C000010845Member"
      decimals="INF"
      id="Fact000781"
      unitRef="Ratio">0.1455</rr:AnnualReturn2019>
    <rr:AnnualReturn2020
      contextRef="From2024-04-302024-04-30_custom_S000003875Member_custom_C000010845Member"
      decimals="INF"
      id="Fact000783"
      unitRef="Ratio">0.0550</rr:AnnualReturn2020>
    <rr:AnnualReturn2021
      contextRef="From2024-04-302024-04-30_custom_S000003875Member_custom_C000010845Member"
      decimals="INF"
      id="Fact000785"
      unitRef="Ratio">0.0520</rr:AnnualReturn2021>
    <rr:AnnualReturn2022
      contextRef="From2024-04-302024-04-30_custom_S000003875Member_custom_C000010845Member"
      decimals="INF"
      id="Fact000787"
      unitRef="Ratio">-0.1137</rr:AnnualReturn2022>
    <rr:AnnualReturn2023
      contextRef="From2024-04-302024-04-30_custom_S000003875Member_custom_C000010845Member"
      decimals="INF"
      id="Fact000789"
      unitRef="Ratio">0.1229</rr:AnnualReturn2023>
    <rr:YearToDateReturnLabel
      contextRef="From2024-04-302024-04-30_custom_S000003875Member"
      id="Fact000790">Year-to-date performance
through</rr:YearToDateReturnLabel>
    <rr:BarChartYearToDateReturnDate
      contextRef="From2024-04-302024-04-30_custom_S000003875Member"
      id="Fact000791">2024-03-31</rr:BarChartYearToDateReturnDate>
    <rr:BarChartYearToDateReturn
      contextRef="From2024-04-302024-04-30_custom_S000003875Member"
      decimals="INF"
      id="Fact000792"
      unitRef="Ratio">0.0175</rr:BarChartYearToDateReturn>
    <rr:HighestQuarterlyReturnLabel
      contextRef="From2024-04-302024-04-30_custom_S000003875Member"
      id="Fact000793">Best calendar quarter</rr:HighestQuarterlyReturnLabel>
    <rr:BarChartHighestQuarterlyReturnDate
      contextRef="From2024-04-302024-04-30_custom_S000003875Member"
      id="Fact000794">2020-06-30</rr:BarChartHighestQuarterlyReturnDate>
    <rr:BarChartHighestQuarterlyReturn
      contextRef="From2024-04-302024-04-30_custom_S000003875Member"
      decimals="INF"
      id="Fact000795"
      unitRef="Ratio">0.0963</rr:BarChartHighestQuarterlyReturn>
    <rr:LowestQuarterlyReturnLabel
      contextRef="From2024-04-302024-04-30_custom_S000003875Member"
      id="Fact000796">Worst calendar quarte</rr:LowestQuarterlyReturnLabel>
    <rr:BarChartLowestQuarterlyReturnDate
      contextRef="From2024-04-302024-04-30_custom_S000003875Member"
      id="Fact000797">2020-03-31</rr:BarChartLowestQuarterlyReturnDate>
    <rr:BarChartLowestQuarterlyReturn
      contextRef="From2024-04-302024-04-30_custom_S000003875Member"
      decimals="INF"
      id="Fact000798"
      unitRef="Ratio">-0.1309</rr:BarChartLowestQuarterlyReturn>
    <rr:PerformanceTableHeading
      contextRef="From2024-04-302024-04-30_custom_S000003875Member"
      id="Fact000799">Average
annual total returns 

(for
periods ended 12/31/23)</rr:PerformanceTableHeading>
    <rr:AverageAnnualReturnYear01
      contextRef="From2024-04-302024-04-30_custom_S000003875Member_custom_C000010845Member"
      decimals="INF"
      id="Fact000801"
      unitRef="Ratio">0.1229</rr:AverageAnnualReturnYear01>
    <rr:AverageAnnualReturnYear05
      contextRef="From2024-04-302024-04-30_custom_S000003875Member_custom_C000010845Member"
      decimals="INF"
      id="Fact000802"
      unitRef="Ratio">0.0482</rr:AverageAnnualReturnYear05>
    <rr:AverageAnnualReturnYear10
      contextRef="From2024-04-302024-04-30_custom_S000003875Member_custom_C000010845Member"
      decimals="INF"
      id="Fact000803"
      unitRef="Ratio">0.0387</rr:AverageAnnualReturnYear10>
    <rr:AverageAnnualReturnYear01
      contextRef="From2024-04-302024-04-30_custom_S000003875Member_custom_C000010846Member"
      decimals="INF"
      id="Fact000804"
      unitRef="Ratio">0.1213</rr:AverageAnnualReturnYear01>
    <rr:AverageAnnualReturnYear05
      contextRef="From2024-04-302024-04-30_custom_S000003875Member_custom_C000010846Member"
      decimals="INF"
      id="Fact000805"
      unitRef="Ratio">0.0460</rr:AverageAnnualReturnYear05>
    <rr:AverageAnnualReturnYear10
      contextRef="From2024-04-302024-04-30_custom_S000003875Member_custom_C000010846Member"
      decimals="INF"
      id="Fact000806"
      unitRef="Ratio">0.0362</rr:AverageAnnualReturnYear10>
    <rr:AverageAnnualReturnYear01
      contextRef="From2024-04-302024-04-30_custom_S000003875Member_custom_JPMDevelopedHYIndexMember"
      decimals="INF"
      id="Fact000807"
      unitRef="Ratio">0.1377</rr:AverageAnnualReturnYear01>
    <rr:AverageAnnualReturnYear05
      contextRef="From2024-04-302024-04-30_custom_S000003875Member_custom_JPMDevelopedHYIndexMember"
      decimals="INF"
      id="Fact000808"
      unitRef="Ratio">0.0543</rr:AverageAnnualReturnYear05>
    <rr:AverageAnnualReturnYear10
      contextRef="From2024-04-302024-04-30_custom_S000003875Member_custom_JPMDevelopedHYIndexMember"
      decimals="INF"
      id="Fact000809"
      unitRef="Ratio">0.0468</rr:AverageAnnualReturnYear10>
    <rr:RiskReturnHeading
      contextRef="From2024-04-302024-04-30_custom_S000003876Member"
      id="Fact000811">Fund summary</rr:RiskReturnHeading>
    <rr:ObjectiveHeading
      contextRef="From2024-04-302024-04-30_custom_S000003876Member"
      id="Fact000812">Goal</rr:ObjectiveHeading>
    <rr:ObjectivePrimaryTextBlock
      contextRef="From2024-04-302024-04-30_custom_S000003876Member"
      id="Fact000813">&lt;p id="xdx_A86_err--ObjectivePrimaryTextBlock_zycrGtzSe6O8" style="font: 10pt/1.5 Arial, Helvetica, Sans-Serif; margin: 0px 42px 9px; color: #000000; font-weight: 300; text-align: left"&gt;
Putnam VT Income Fund seeks high current income consistent with what Putnam Investment Management, LLC believes to be prudent risk.
&lt;/p&gt;

</rr:ObjectivePrimaryTextBlock>
    <rr:ExpenseHeading
      contextRef="From2024-04-302024-04-30_custom_S000003876Member"
      id="Fact000814">Fees and expenses</rr:ExpenseHeading>
    <rr:ExpenseNarrativeTextBlock
      contextRef="From2024-04-302024-04-30_custom_S000003876Member"
      id="Fact000815">&lt;p id="xdx_A88_err--ExpenseNarrativeTextBlock_zg7WNGuQKhF9" style="font: 10pt/1.5 Arial, Helvetica, Sans-Serif; margin: 0px 42px 9px; color: #000000; font-weight: 300; text-align: left"&gt;
The following table describes the fees and expenses you may pay if you buy, hold and sell shares of the fund. You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in the tables and examples below. The fees and expenses information does not reflect insurance-related charges or expenses borne by contract holders indirectly investing in the fund. If it did, expenses would be higher.
&lt;/p&gt;

</rr:ExpenseNarrativeTextBlock>
    <rr:OperatingExpensesCaption
      contextRef="From2024-04-302024-04-30_custom_S000003876Member"
      id="Fact000816">
Annual fund operating expenses 



(expenses you pay each year as a percentage of the value of your investment)
</rr:OperatingExpensesCaption>
    <rr:ManagementFeesOverAssets
      contextRef="From2024-04-302024-04-30_custom_S000003876Member_custom_C000010847Member"
      decimals="INF"
      id="Fact000818"
      unitRef="Ratio">0.0039</rr:ManagementFeesOverAssets>
    <rr:DistributionAndService12b1FeesOverAssets
      contextRef="From2024-04-302024-04-30_custom_S000003876Member_custom_C000010847Member"
      decimals="INF"
      id="Fact000819"
      unitRef="Ratio">0</rr:DistributionAndService12b1FeesOverAssets>
    <rr:OtherExpensesOverAssets
      contextRef="From2024-04-302024-04-30_custom_S000003876Member_custom_C000010847Member"
      decimals="INF"
      id="Fact000820"
      unitRef="Ratio">0.0025</rr:OtherExpensesOverAssets>
    <rr:ExpensesOverAssets
      contextRef="From2024-04-302024-04-30_custom_S000003876Member_custom_C000010847Member"
      decimals="INF"
      id="Fact000821"
      unitRef="Ratio">0.0064</rr:ExpensesOverAssets>
    <rr:ManagementFeesOverAssets
      contextRef="From2024-04-302024-04-30_custom_S000003876Member_custom_C000010848Member"
      decimals="INF"
      id="Fact000822"
      unitRef="Ratio">0.0039</rr:ManagementFeesOverAssets>
    <rr:DistributionAndService12b1FeesOverAssets
      contextRef="From2024-04-302024-04-30_custom_S000003876Member_custom_C000010848Member"
      decimals="INF"
      id="Fact000823"
      unitRef="Ratio">0.0025</rr:DistributionAndService12b1FeesOverAssets>
    <rr:OtherExpensesOverAssets
      contextRef="From2024-04-302024-04-30_custom_S000003876Member_custom_C000010848Member"
      decimals="INF"
      id="Fact000824"
      unitRef="Ratio">0.0025</rr:OtherExpensesOverAssets>
    <rr:ExpensesOverAssets
      contextRef="From2024-04-302024-04-30_custom_S000003876Member_custom_C000010848Member"
      decimals="INF"
      id="Fact000825"
      unitRef="Ratio">0.0089</rr:ExpensesOverAssets>
    <rr:ExpenseExampleHeading
      contextRef="From2024-04-302024-04-30_custom_S000003876Member"
      id="Fact000826">Example</rr:ExpenseExampleHeading>
    <rr:ExpenseExampleNarrativeTextBlock
      contextRef="From2024-04-302024-04-30_custom_S000003876Member"
      id="Fact000827">&lt;p id="xdx_A81_err--ExpenseExampleNarrativeTextBlock_zCMFQ9mHWa6a" style="font: 10pt/1.5 Arial, Helvetica, Sans-Serif; margin: 0px 42px 9px; color: #000000; font-weight: 300; text-align: left"&gt;
The following hypothetical example is intended to help you compare the cost of investing in the fund with the cost of investing in other funds. The example does not reflect insurance-related charges or expenses. If it did, expenses would be higher. It assumes that you invest $10,000 in the fund for the time periods indicated and then redeem or hold all your shares at the end of those periods. It assumes a 5% return on your investment each year and that the fund&#x2019;s operating expenses remain the same. Your actual costs may be higher or lower.
&lt;/p&gt;

</rr:ExpenseExampleNarrativeTextBlock>
    <rr:ExpenseExampleYear01
      contextRef="From2024-04-302024-04-30_custom_S000003876Member_custom_C000010847Member"
      decimals="0"
      id="Fact000829"
      unitRef="USD">65</rr:ExpenseExampleYear01>
    <rr:ExpenseExampleYear03
      contextRef="From2024-04-302024-04-30_custom_S000003876Member_custom_C000010847Member"
      decimals="0"
      id="Fact000830"
      unitRef="USD">205</rr:ExpenseExampleYear03>
    <rr:ExpenseExampleYear05
      contextRef="From2024-04-302024-04-30_custom_S000003876Member_custom_C000010847Member"
      decimals="0"
      id="Fact000831"
      unitRef="USD">357</rr:ExpenseExampleYear05>
    <rr:ExpenseExampleYear10
      contextRef="From2024-04-302024-04-30_custom_S000003876Member_custom_C000010847Member"
      decimals="0"
      id="Fact000832"
      unitRef="USD">798</rr:ExpenseExampleYear10>
    <rr:ExpenseExampleYear01
      contextRef="From2024-04-302024-04-30_custom_S000003876Member_custom_C000010848Member"
      decimals="0"
      id="Fact000833"
      unitRef="USD">91</rr:ExpenseExampleYear01>
    <rr:ExpenseExampleYear03
      contextRef="From2024-04-302024-04-30_custom_S000003876Member_custom_C000010848Member"
      decimals="0"
      id="Fact000834"
      unitRef="USD">284</rr:ExpenseExampleYear03>
    <rr:ExpenseExampleYear05
      contextRef="From2024-04-302024-04-30_custom_S000003876Member_custom_C000010848Member"
      decimals="0"
      id="Fact000835"
      unitRef="USD">493</rr:ExpenseExampleYear05>
    <rr:ExpenseExampleYear10
      contextRef="From2024-04-302024-04-30_custom_S000003876Member_custom_C000010848Member"
      decimals="0"
      id="Fact000836"
      unitRef="USD">1096</rr:ExpenseExampleYear10>
    <rr:PortfolioTurnoverHeading
      contextRef="From2024-04-302024-04-30_custom_S000003876Member"
      id="Fact000837">Portfolio turnover</rr:PortfolioTurnoverHeading>
    <rr:PortfolioTurnoverTextBlock
      contextRef="From2024-04-302024-04-30_custom_S000003876Member"
      id="Fact000838">&lt;p id="xdx_A8B_err--PortfolioTurnoverTextBlock_z8wg9dBX7nD5" style="font: 10pt/1.5 Arial, Helvetica, Sans-Serif; margin: 0px 42px 9px; color: #000000; font-weight: 300; text-align: left"&gt;&lt;span style="-sec-ix-redline: true"&gt;The
fund pays transaction-related costs, such as commissions, when it buys and sells securities (or &#x201c;turns over&#x201d; its portfolio).
A higher turnover rate may indicate higher transaction costs. These costs, which are not reflected in annual fund operating expenses
or the above example, affect fund performance. The fund&#x2019;s turnover rate in the most recent fiscal year was &lt;span id="xdx_90B_err--PortfolioTurnoverRate_dU_c20240430__20240430__dei--LegalEntityAxis__custom--S000003876Member_zWhLOG15bMib"&gt;890%&lt;/span&gt;.&lt;/span&gt;&lt;/p&gt;

</rr:PortfolioTurnoverTextBlock>
    <rr:PortfolioTurnoverRate
      contextRef="From2024-04-302024-04-30_custom_S000003876Member"
      decimals="INF"
      id="Fact000839"
      unitRef="Ratio">8.90</rr:PortfolioTurnoverRate>
    <rr:StrategyHeading
      contextRef="From2024-04-302024-04-30_custom_S000003876Member"
      id="Fact000840">Investments, risks, and performance</rr:StrategyHeading>
    <rr:StrategyNarrativeTextBlock
      contextRef="From2024-04-302024-04-30_custom_S000003876Member"
      id="Fact000841">&lt;p id="xdx_A88_err--StrategyNarrativeTextBlock_z0svT9H8xtC7" style="font: 600 10pt/1.5 Arial, Helvetica, Sans-Serif; margin: 15px 42px 0px; color: #000000"&gt;
&lt;b&gt;Investments&lt;/b&gt;
&lt;/p&gt;

&lt;p style="font: 10pt/1.5 Arial, Helvetica, Sans-Serif; margin: 0px 42px 9px; color: #000000; font-weight: 300; text-align: left"&gt;
We invest mainly in bonds that are securitized debt instruments (such as mortgage-backed investments) and related derivative instruments, and other obligations of companies and governments worldwide denominated in U.S. dollars or (to a lesser extent) foreign currencies, are either investment-grade or below-investment-grade in quality (sometimes referred to as &#x201c;junk bonds&#x201d;) and have intermediate- to long-term maturities (three years or longer). The fund currently has significant investment exposure to residential and commercial mortgage-backed securities.
&lt;/p&gt;

&lt;p style="font: 10pt/1.5 Arial, Helvetica, Sans-Serif; margin: 0px 42px 9px; color: #000000; font-weight: 300; text-align: left"&gt;
We may consider, among other factors, credit, interest rate and prepayment risks, as well as general market conditions, when deciding whether to buy or sell investments. We typically use to a significant extent derivatives, including credit default swaps, interest rate swaps, total return swaps, to-be-announced (TBA) commitments, futures, options and swaptions, including on mortgage-backed securities and indices, and certain foreign currency transactions, for both hedging and non-hedging purposes, including to obtain or adjust exposure to mortgage-backed investments.
&lt;/p&gt;

</rr:StrategyNarrativeTextBlock>
    <rr:RiskHeading
      contextRef="From2024-04-302024-04-30_custom_S000003876Member"
      id="Fact000842">Risks</rr:RiskHeading>
    <rr:RiskTextBlock
      contextRef="From2024-04-302024-04-30_custom_S000003876Member"
      id="Fact000843">&lt;p id="xdx_A8A_err--RiskTextBlock_z6qmPzR7tMG4" style="font: 10pt/1.5 Arial, Helvetica, Sans-Serif; margin: 0px 42px 9px; color: #000000; font-weight: 300; text-align: left"&gt;
&lt;span id="xdx_90D_err--RiskTextBlock_dU_c20240430__20240430__dei--LegalEntityAxis__custom--S000003876Member__rr--RiskAxis__rr--RiskLoseMoneyMember_zTEWHYuVywhd"&gt;It is important to understand that you can lose money by investing in the fund.&lt;/span&gt;
&lt;/p&gt;

&lt;p style="font: 10pt/1.5 Arial, Helvetica, Sans-Serif; margin: 0px 42px 9px; color: #000000; font-weight: 300; text-align: left"&gt;
The value of investments in the fund&#x2019;s portfolio may fall or fail to rise over extended periods of time for a variety of reasons, including general economic, political or financial market conditions, investor sentiment and market perceptions, government actions, geopolitical events or changes, outbreaks of infectious illnesses or other widespread public health issues, and factors related to a specific issuer, geography, industry or sector. These and other factors may lead to increased volatility and reduced liquidity in the fund&#x2019;s portfolio holdings, may negatively impact the fund&#x2019;s performance, and may exacerbate other risks to which the fund is subject.
&lt;/p&gt;

&lt;p style="font: 10pt/1.5 Arial, Helvetica, Sans-Serif; margin: 0px 42px 9px; color: #000000; font-weight: 300; text-align: left"&gt;
The risks associated with bond investments include interest rate risk, which is the risk that the value of the fund&#x2019;s investments is likely to fall if interest rates rise. Bond investments are also subject to credit risk, which is the risk that the issuer of a bond may default on payment of interest or principal. Bond investments may be more susceptible to downgrades or defaults during economic downturns or other periods of economic stress. Interest rate risk is generally greater for longer-term bonds, and credit risk is generally greater for below-investment-grade bonds (a significant part of the fund&#x2019;s investments), which can be more sensitive to changes in markets, credit conditions, and interest rates and may be considered speculative.
&lt;/p&gt;

&lt;p style="font: 10pt/1.5 Arial, Helvetica, Sans-Serif; margin: 0px 42px 9px; color: #000000; font-weight: 300; text-align: left"&gt;
Mortgage-backed investments, unlike traditional debt investments, are also subject to prepayment risk, which means that they may increase in value less than other bonds when interest rates decline and decline in value more than other bonds when interest rates rise. We may have to invest the proceeds from prepaid investments, including mortgage-backed investments, in other investments with less attractive terms and yields. The fund&#x2019;s investments in mortgage-backed securities and asset-backed securities, and in certain other securities and derivatives, may be 
&lt;/p&gt;



&lt;p&gt;
&lt;br/&gt;
&lt;br/&gt;
&lt;/p&gt;

&lt;div style="border-top: Black 1pt solid; margin: 18pt auto; font-size: 1pt"&gt;&#160;&lt;/div&gt;

&lt;p&gt;&lt;br/&gt;
&lt;br/&gt;
&lt;/p&gt;

&lt;p style="font: 10pt/1.5 Arial, Helvetica, Sans-Serif; margin: 0px 42px 9px; color: #000000; font-weight: 300; text-align: left"&gt;
or become illiquid. The fund&#x2019;s investments in mortgage-backed securities may make the fund&#x2019;s net asset value more susceptible to economic, market, political and other developments affecting the residential and commercial real estate markets and the servicing of mortgage loans secured by real estate properties. During periods of difficult economic conditions, delinquencies and losses on commercial mortgage-backed investments in particular generally increase, including as a result of the effects of those conditions on commercial real estate markets, the ability of commercial tenants to make loan payments, and the ability of a property to attract and retain commercial tenants. 
&lt;/p&gt;

&lt;p style="font: 10pt/1.5 Arial, Helvetica, Sans-Serif; margin: 0px 42px 9px; color: #000000; font-weight: 300; text-align: left"&gt;
Our use of derivatives may increase the risks of investing in the fund by increasing investment exposure (which may be considered leverage) or, in the case of many over-the-counter instruments, because of the potential inability to terminate or sell derivative positions and the potential failure of the other party to the instrument to meet its obligations. The risk of a party failing to meet its obligations may increase if the fund has significant exposure to that counterparty. The value of derivatives may move in unexpected ways due to unanticipated market movements, the use of leverage, imperfect correlation between the derivative instrument and the reference asset, or other factors, especially in unusual market conditions, and volatility in the value of derivatives could adversely impact the fund&#x2019;s returns, obligations and exposures. Derivatives are also subject to other risks, including liquidity risk (e.g., liquidity demands arising from the requirement to make payments to a derivative counterparty), operational risk (e.g., settlement issues or system failures) and legal risk (e.g., insufficient legal documentation or contract enforceability issues).
&lt;/p&gt;

&lt;p style="font: 10pt/1.5 Arial, Helvetica, Sans-Serif; margin: 0px 42px 9px; color: #000000; font-weight: 300; text-align: left"&gt;
The fund expects to engage in frequent trading. Funds with high turnover may incur higher transaction costs than funds with relatively lower turnover, which may detract from performance. 
&lt;/p&gt;

&lt;p style="font: 10pt/1.5 Arial, Helvetica, Sans-Serif; margin: 0px 42px 9px; color: #000000; font-weight: 300; text-align: left"&gt;
There is no guarantee that the investment techniques, analyses, or judgments that we apply in making investment decisions for the fund will produce the intended outcome or that the investments we select for the fund will perform as well as other securities that were not selected for the fund. We, or the fund&#x2019;s other service providers, may experience disruptions or operating errors that could negatively impact the fund. 
&lt;/p&gt;

&lt;p style="font: 10pt/1.5 Arial, Helvetica, Sans-Serif; margin: 0px 42px 9px; color: #000000; font-weight: 300; text-align: left"&gt;&lt;span style="-sec-ix-redline: true"&gt;The
fund may be an investment option for mutual funds that are managed by Franklin Resources, Inc. (Franklin Templeton) and its affiliates
as &#x201c;funds of funds&#x201d; and other investors with substantial investments in the fund. Such shareholders may at times be considered
to control the fund. Dispositions of a large number of shares by these shareholders may adversely affect the fund&#x2019;s liquidity and
net&#160;assets. These redemptions may also force the fund to sell securities, which may increase the fund&#x2019;s brokerage costs.&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt/1.5 Arial, Helvetica, Sans-Serif; margin: 0px 42px 9px; color: #000000; font-weight: 300; text-align: left"&gt;
The fund may not achieve its goal, and it is not intended to be a complete investment program. &lt;span id="xdx_904_err--RiskTextBlock_dU_c20240430__20240430__dei--LegalEntityAxis__custom--S000003876Member__rr--RiskAxis__rr--RiskNotInsuredDepositoryInstitutionMember_zuUY0sLERIVl"&gt;An investment in the fund is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency.&lt;/span&gt;
&lt;/p&gt;

</rr:RiskTextBlock>
    <rr:RiskTextBlock
      contextRef="From2024-04-302024-04-30_custom_S000003876Member_rr_RiskLoseMoneyMember"
      id="Fact000844">It is important to understand that you can lose money by investing in the fund.</rr:RiskTextBlock>
    <rr:RiskTextBlock
      contextRef="From2024-04-302024-04-30_custom_S000003876Member_rr_RiskNotInsuredDepositoryInstitutionMember"
      id="Fact000846">An investment in the fund is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency.</rr:RiskTextBlock>
    <rr:BarChartAndPerformanceTableHeading
      contextRef="From2024-04-302024-04-30_custom_S000003876Member"
      id="Fact000847">Performance</rr:BarChartAndPerformanceTableHeading>
    <rr:PerformanceNarrativeTextBlock
      contextRef="From2024-04-302024-04-30_custom_S000003876Member"
      id="Fact000848">&lt;p id="xdx_A84_err--PerformanceNarrativeTextBlock_ztMJ56Zi7gNb" style="font: 10pt/1.5 Arial, Helvetica, Sans-Serif; margin: 0px 42px 9px; color: #000000; font-weight: 300; text-align: left"&gt;
&lt;span id="xdx_906_err--PerformanceInformationIllustratesVariabilityOfReturns_dU_c20240430__20240430__dei--LegalEntityAxis__custom--S000003876Member_zh3hz9udkq72"&gt;The performance information below gives some indication of the risks associated with an investment in the fund by showing the fund&#x2019;s performance year to year and over time.&lt;/span&gt; The performance information does not reflect insurance-related charges or expenses. If it did, performance would be lower. &lt;span id="xdx_906_err--PerformancePastDoesNotIndicateFuture_dU_c20240430__20240430__dei--LegalEntityAxis__custom--S000003876Member_zjDfzMTbL5t8"&gt;Please remember that past performance is not necessarily an indication of future results.&lt;/span&gt; 
&lt;/p&gt;

</rr:PerformanceNarrativeTextBlock>
    <rr:PerformanceInformationIllustratesVariabilityOfReturns
      contextRef="From2024-04-302024-04-30_custom_S000003876Member"
      id="Fact000849">The performance information below gives some indication of the risks associated with an investment in the fund by showing the fund&#x2019;s performance year to year and over time.</rr:PerformanceInformationIllustratesVariabilityOfReturns>
    <rr:PerformancePastDoesNotIndicateFuture
      contextRef="From2024-04-302024-04-30_custom_S000003876Member"
      id="Fact000850">Please remember that past performance is not necessarily an indication of future results.</rr:PerformancePastDoesNotIndicateFuture>
    <rr:BarChartHeading
      contextRef="From2024-04-302024-04-30_custom_S000003876Member"
      id="Fact000851">Annual total returns for class IA shares</rr:BarChartHeading>
    <rr:AnnualReturn2014
      contextRef="From2024-04-302024-04-30_custom_S000003876Member_custom_C000010847Member"
      decimals="INF"
      id="Fact000854"
      unitRef="Ratio">0.0668</rr:AnnualReturn2014>
    <rr:AnnualReturn2015
      contextRef="From2024-04-302024-04-30_custom_S000003876Member_custom_C000010847Member"
      decimals="INF"
      id="Fact000856"
      unitRef="Ratio">-0.0119</rr:AnnualReturn2015>
    <rr:AnnualReturn2016
      contextRef="From2024-04-302024-04-30_custom_S000003876Member_custom_C000010847Member"
      decimals="INF"
      id="Fact000858"
      unitRef="Ratio">0.0227</rr:AnnualReturn2016>
    <rr:AnnualReturn2017
      contextRef="From2024-04-302024-04-30_custom_S000003876Member_custom_C000010847Member"
      decimals="INF"
      id="Fact000860"
      unitRef="Ratio">0.0590</rr:AnnualReturn2017>
    <rr:AnnualReturn2018
      contextRef="From2024-04-302024-04-30_custom_S000003876Member_custom_C000010847Member"
      decimals="INF"
      id="Fact000862"
      unitRef="Ratio">0.0037</rr:AnnualReturn2018>
    <rr:AnnualReturn2019
      contextRef="From2024-04-302024-04-30_custom_S000003876Member_custom_C000010847Member"
      decimals="INF"
      id="Fact000864"
      unitRef="Ratio">0.1224</rr:AnnualReturn2019>
    <rr:AnnualReturn2020
      contextRef="From2024-04-302024-04-30_custom_S000003876Member_custom_C000010847Member"
      decimals="INF"
      id="Fact000866"
      unitRef="Ratio">0.0600</rr:AnnualReturn2020>
    <rr:AnnualReturn2021
      contextRef="From2024-04-302024-04-30_custom_S000003876Member_custom_C000010847Member"
      decimals="INF"
      id="Fact000868"
      unitRef="Ratio">-0.0444</rr:AnnualReturn2021>
    <rr:AnnualReturn2022
      contextRef="From2024-04-302024-04-30_custom_S000003876Member_custom_C000010847Member"
      decimals="INF"
      id="Fact000870"
      unitRef="Ratio">-0.1348</rr:AnnualReturn2022>
    <rr:AnnualReturn2023
      contextRef="From2024-04-302024-04-30_custom_S000003876Member_custom_C000010847Member"
      decimals="INF"
      id="Fact000872"
      unitRef="Ratio">0.0496</rr:AnnualReturn2023>
    <rr:YearToDateReturnLabel
      contextRef="From2024-04-302024-04-30_custom_S000003876Member"
      id="Fact000873">Year-to-date performance
through</rr:YearToDateReturnLabel>
    <rr:BarChartYearToDateReturnDate
      contextRef="From2024-04-302024-04-30_custom_S000003876Member"
      id="Fact000874">2024-03-31</rr:BarChartYearToDateReturnDate>
    <rr:BarChartYearToDateReturn
      contextRef="From2024-04-302024-04-30_custom_S000003876Member"
      decimals="INF"
      id="Fact000875"
      unitRef="Ratio">0.0004</rr:BarChartYearToDateReturn>
    <rr:HighestQuarterlyReturnLabel
      contextRef="From2024-04-302024-04-30_custom_S000003876Member"
      id="Fact000876">Best calendar quarter</rr:HighestQuarterlyReturnLabel>
    <rr:BarChartHighestQuarterlyReturnDate
      contextRef="From2024-04-302024-04-30_custom_S000003876Member"
      id="Fact000877">2023-12-31</rr:BarChartHighestQuarterlyReturnDate>
    <rr:BarChartHighestQuarterlyReturn
      contextRef="From2024-04-302024-04-30_custom_S000003876Member"
      decimals="INF"
      id="Fact000878"
      unitRef="Ratio">0.0701</rr:BarChartHighestQuarterlyReturn>
    <rr:LowestQuarterlyReturnLabel
      contextRef="From2024-04-302024-04-30_custom_S000003876Member"
      id="Fact000879">Worst calendar quarte</rr:LowestQuarterlyReturnLabel>
    <rr:BarChartLowestQuarterlyReturnDate
      contextRef="From2024-04-302024-04-30_custom_S000003876Member"
      id="Fact000880">2022-06-30</rr:BarChartLowestQuarterlyReturnDate>
    <rr:BarChartLowestQuarterlyReturn
      contextRef="From2024-04-302024-04-30_custom_S000003876Member"
      decimals="INF"
      id="Fact000881"
      unitRef="Ratio">-0.0577</rr:BarChartLowestQuarterlyReturn>
    <rr:PerformanceTableHeading
      contextRef="From2024-04-302024-04-30_custom_S000003876Member"
      id="Fact000882">Average
annual total returns

(for
periods ended 12/31/23)</rr:PerformanceTableHeading>
    <rr:AverageAnnualReturnYear01
      contextRef="From2024-04-302024-04-30_custom_S000003876Member_custom_C000010847Member"
      decimals="INF"
      id="Fact000884"
      unitRef="Ratio">0.0496</rr:AverageAnnualReturnYear01>
    <rr:AverageAnnualReturnYear05
      contextRef="From2024-04-302024-04-30_custom_S000003876Member_custom_C000010847Member"
      decimals="INF"
      id="Fact000885"
      unitRef="Ratio">0.0064</rr:AverageAnnualReturnYear05>
    <rr:AverageAnnualReturnYear10
      contextRef="From2024-04-302024-04-30_custom_S000003876Member_custom_C000010847Member"
      decimals="INF"
      id="Fact000886"
      unitRef="Ratio">0.0170</rr:AverageAnnualReturnYear10>
    <rr:AverageAnnualReturnYear01
      contextRef="From2024-04-302024-04-30_custom_S000003876Member_custom_C000010848Member"
      decimals="INF"
      id="Fact000887"
      unitRef="Ratio">0.0469</rr:AverageAnnualReturnYear01>
    <rr:AverageAnnualReturnYear05
      contextRef="From2024-04-302024-04-30_custom_S000003876Member_custom_C000010848Member"
      decimals="INF"
      id="Fact000888"
      unitRef="Ratio">0.0037</rr:AverageAnnualReturnYear05>
    <rr:AverageAnnualReturnYear10
      contextRef="From2024-04-302024-04-30_custom_S000003876Member_custom_C000010848Member"
      decimals="INF"
      id="Fact000889"
      unitRef="Ratio">0.0143</rr:AverageAnnualReturnYear10>
    <rr:AverageAnnualReturnYear01
      contextRef="From2024-04-302024-04-30_custom_S000003876Member_custom_BLUSAggregateBondIndexMember"
      decimals="INF"
      id="Fact000890"
      unitRef="Ratio">0.0553</rr:AverageAnnualReturnYear01>
    <rr:AverageAnnualReturnYear05
      contextRef="From2024-04-302024-04-30_custom_S000003876Member_custom_BLUSAggregateBondIndexMember"
      decimals="INF"
      id="Fact000891"
      unitRef="Ratio">0.0110</rr:AverageAnnualReturnYear05>
    <rr:AverageAnnualReturnYear10
      contextRef="From2024-04-302024-04-30_custom_S000003876Member_custom_BLUSAggregateBondIndexMember"
      decimals="INF"
      id="Fact000892"
      unitRef="Ratio">0.0181</rr:AverageAnnualReturnYear10>
    <rr:PerformanceTableClosingTextBlock
      contextRef="From2024-04-302024-04-30_custom_S000003876Member"
      id="Fact000893">&lt;div id="xdx_A88_err--PerformanceTableClosingTextBlock_z4QNETS6k854"&gt;&lt;/div&gt;
&lt;table style="font: 300 9pt/1.5 Arial, Helvetica, Sans-Serif; margin-left: 10px; width: 90%"&gt;
&lt;tr style="vertical-align: top"&gt;
&lt;td style="width: 25px; text-align: right"&gt;&lt;/td&gt;
&lt;td&gt;&lt;span style="-sec-ix-redline: true"&gt;All Bloomberg indices are provided by Bloomberg Index Services Limited.&lt;/span&gt;&lt;/td&gt;

&lt;/tr&gt;
&lt;/table&gt;

&lt;table style="font: 300 9pt/1.5 Arial, Helvetica, Sans-Serif; margin-left: 10px; width: 90%"&gt;
&lt;tr style="vertical-align: top"&gt;
&lt;td style="width: 25px; text-align: right"&gt;&lt;/td&gt;
&lt;td&gt;&lt;span style="-sec-ix-redline: true"&gt;BLOOMBERG&#xae; is a trademark and service mark of Bloomberg Finance L.P. and its affiliates (collectively &#x201c;Bloomberg&#x201d;).
Bloomberg or Bloomberg&#x2019;s licensors, own all proprietary rights in the Bloomberg Indices. Neither Bloomberg nor Bloomberg&#x2019;s
licensors approve or endorse this material, or guarantee the accuracy or completeness of any information herein, or make any warranty,
express or implied, as to the results to be obtained therefrom, and to the maximum extent allowed by law, neither shall have any liability
or responsibility for injury or damages arising in connection therewith.&lt;/span&gt;&lt;/td&gt;

&lt;/tr&gt;
&lt;/table&gt;

</rr:PerformanceTableClosingTextBlock>
    <rr:RiskReturnHeading
      contextRef="From2024-04-302024-04-30_custom_S000003877Member"
      id="Fact000895">Fund summary</rr:RiskReturnHeading>
    <rr:ObjectiveHeading
      contextRef="From2024-04-302024-04-30_custom_S000003877Member"
      id="Fact000896">Goal</rr:ObjectiveHeading>
    <rr:ObjectivePrimaryTextBlock
      contextRef="From2024-04-302024-04-30_custom_S000003877Member"
      id="Fact000897">&lt;p id="xdx_A84_err--ObjectivePrimaryTextBlock_z9h3bpfHIU8f" style="font: 10pt/1.5 Arial, Helvetica, Sans-Serif; margin: 0px 42px 9px; color: #000000; font-weight: 300; text-align: left"&gt;
Putnam VT International Equity Fund seeks capital appreciation..
&lt;/p&gt;

</rr:ObjectivePrimaryTextBlock>
    <rr:ExpenseHeading
      contextRef="From2024-04-302024-04-30_custom_S000003877Member"
      id="Fact000898">Fees and expenses</rr:ExpenseHeading>
    <rr:ExpenseNarrativeTextBlock
      contextRef="From2024-04-302024-04-30_custom_S000003877Member"
      id="Fact000899">&lt;p id="xdx_A86_err--ExpenseNarrativeTextBlock_zcZtRjAAFL46" style="font: 10pt/1.5 Arial, Helvetica, Sans-Serif; margin: 0px 42px 9px; color: #000000; font-weight: 300; text-align: left"&gt;
The following table describes the fees and expenses you may pay if you buy, hold and sell shares of the fund. You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in the tables and examples below. The fees and expenses information does not reflect insurance-related charges or expenses borne by contract holders indirectly investing in the fund. If it did, expenses would be higher.
&lt;/p&gt;

</rr:ExpenseNarrativeTextBlock>
    <rr:OperatingExpensesCaption
      contextRef="From2024-04-302024-04-30_custom_S000003877Member"
      id="Fact000900">
Annual fund operating expenses 



(expenses you pay each year as a percentage of the value of your investment)
</rr:OperatingExpensesCaption>
    <rr:ManagementFeesOverAssets
      contextRef="From2024-04-302024-04-30_custom_S000003877Member_custom_C000010849Member"
      decimals="INF"
      id="Fact000902"
      unitRef="Ratio">0.0069</rr:ManagementFeesOverAssets>
    <rr:DistributionAndService12b1FeesOverAssets
      contextRef="From2024-04-302024-04-30_custom_S000003877Member_custom_C000010849Member"
      decimals="INF"
      id="Fact000903"
      unitRef="Ratio">0</rr:DistributionAndService12b1FeesOverAssets>
    <rr:OtherExpensesOverAssets
      contextRef="From2024-04-302024-04-30_custom_S000003877Member_custom_C000010849Member"
      decimals="INF"
      id="Fact000904"
      unitRef="Ratio">0.0016</rr:OtherExpensesOverAssets>
    <rr:ExpensesOverAssets
      contextRef="From2024-04-302024-04-30_custom_S000003877Member_custom_C000010849Member"
      decimals="INF"
      id="Fact000905"
      unitRef="Ratio">0.0085</rr:ExpensesOverAssets>
    <rr:ManagementFeesOverAssets
      contextRef="From2024-04-302024-04-30_custom_S000003877Member_custom_C000010850Member"
      decimals="INF"
      id="Fact000906"
      unitRef="Ratio">0.0069</rr:ManagementFeesOverAssets>
    <rr:DistributionAndService12b1FeesOverAssets
      contextRef="From2024-04-302024-04-30_custom_S000003877Member_custom_C000010850Member"
      decimals="INF"
      id="Fact000907"
      unitRef="Ratio">0.0025</rr:DistributionAndService12b1FeesOverAssets>
    <rr:OtherExpensesOverAssets
      contextRef="From2024-04-302024-04-30_custom_S000003877Member_custom_C000010850Member"
      decimals="INF"
      id="Fact000908"
      unitRef="Ratio">0.0016</rr:OtherExpensesOverAssets>
    <rr:ExpensesOverAssets
      contextRef="From2024-04-302024-04-30_custom_S000003877Member_custom_C000010850Member"
      decimals="INF"
      id="Fact000909"
      unitRef="Ratio">0.0110</rr:ExpensesOverAssets>
    <rr:ExpenseExampleHeading
      contextRef="From2024-04-302024-04-30_custom_S000003877Member"
      id="Fact000910">Example</rr:ExpenseExampleHeading>
    <rr:ExpenseExampleNarrativeTextBlock
      contextRef="From2024-04-302024-04-30_custom_S000003877Member"
      id="Fact000911">&lt;p id="xdx_A82_err--ExpenseExampleNarrativeTextBlock_zLxi0C6phKcf" style="font: 10pt/1.5 Arial, Helvetica, Sans-Serif; margin: 0px 42px 9px; color: #000000; font-weight: 300; text-align: left"&gt;
The following hypothetical example is intended to help you compare the cost of investing in the fund with the cost of investing in other funds. The example does not reflect insurance-related charges or expenses. If it did, expenses would be higher. It assumes that you invest $10,000 in the fund for the time periods indicated and then redeem or hold all your shares at the end of those periods. It assumes a 5% return on your investment each year and that the fund&#x2019;s operating expenses remain the same. Your actual costs may be higher or lower.
&lt;/p&gt;

</rr:ExpenseExampleNarrativeTextBlock>
    <rr:ExpenseExampleYear01
      contextRef="From2024-04-302024-04-30_custom_S000003877Member_custom_C000010849Member"
      decimals="0"
      id="Fact000913"
      unitRef="USD">87</rr:ExpenseExampleYear01>
    <rr:ExpenseExampleYear03
      contextRef="From2024-04-302024-04-30_custom_S000003877Member_custom_C000010849Member"
      decimals="0"
      id="Fact000914"
      unitRef="USD">271</rr:ExpenseExampleYear03>
    <rr:ExpenseExampleYear05
      contextRef="From2024-04-302024-04-30_custom_S000003877Member_custom_C000010849Member"
      decimals="0"
      id="Fact000915"
      unitRef="USD">471</rr:ExpenseExampleYear05>
    <rr:ExpenseExampleYear10
      contextRef="From2024-04-302024-04-30_custom_S000003877Member_custom_C000010849Member"
      decimals="0"
      id="Fact000916"
      unitRef="USD">1049</rr:ExpenseExampleYear10>
    <rr:ExpenseExampleYear01
      contextRef="From2024-04-302024-04-30_custom_S000003877Member_custom_C000010850Member"
      decimals="0"
      id="Fact000917"
      unitRef="USD">112</rr:ExpenseExampleYear01>
    <rr:ExpenseExampleYear03
      contextRef="From2024-04-302024-04-30_custom_S000003877Member_custom_C000010850Member"
      decimals="0"
      id="Fact000918"
      unitRef="USD">350</rr:ExpenseExampleYear03>
    <rr:ExpenseExampleYear05
      contextRef="From2024-04-302024-04-30_custom_S000003877Member_custom_C000010850Member"
      decimals="0"
      id="Fact000919"
      unitRef="USD">606</rr:ExpenseExampleYear05>
    <rr:ExpenseExampleYear10
      contextRef="From2024-04-302024-04-30_custom_S000003877Member_custom_C000010850Member"
      decimals="0"
      id="Fact000920"
      unitRef="USD">1340</rr:ExpenseExampleYear10>
    <rr:PortfolioTurnoverHeading
      contextRef="From2024-04-302024-04-30_custom_S000003877Member"
      id="Fact000921">Portfolio turnover</rr:PortfolioTurnoverHeading>
    <rr:PortfolioTurnoverTextBlock
      contextRef="From2024-04-302024-04-30_custom_S000003877Member"
      id="Fact000922">&lt;p id="xdx_A86_err--PortfolioTurnoverTextBlock_zpMzaYEIZdXc" style="font: 10pt/1.5 Arial, Helvetica, Sans-Serif; margin: 0px 42px 9px; color: #000000; font-weight: 300; text-align: left"&gt;&lt;span style="-sec-ix-redline: true"&gt;The
fund pays transaction-related costs, such as commissions, when it buys and sells securities (or &#x201c;turns over&#x201d; its portfolio).
A higher turnover rate may indicate higher transaction costs. These costs, which are not reflected in annual fund operating expenses
or the above example, affect fund performance. The fund&#x2019;s turnover rate in the most recent fiscal year was &lt;span id="xdx_90F_err--PortfolioTurnoverRate_dU_c20240430__20240430__dei--LegalEntityAxis__custom--S000003877Member_zgEjyjFFIH3j"&gt;68%&lt;/span&gt;.&lt;/span&gt;&lt;/p&gt;

</rr:PortfolioTurnoverTextBlock>
    <rr:PortfolioTurnoverRate
      contextRef="From2024-04-302024-04-30_custom_S000003877Member"
      decimals="INF"
      id="Fact000923"
      unitRef="Ratio">0.68</rr:PortfolioTurnoverRate>
    <rr:StrategyHeading
      contextRef="From2024-04-302024-04-30_custom_S000003877Member"
      id="Fact000924">Investments, risks, and performance</rr:StrategyHeading>
    <rr:StrategyNarrativeTextBlock
      contextRef="From2024-04-302024-04-30_custom_S000003877Member"
      id="Fact000925">&lt;p id="xdx_A84_err--StrategyNarrativeTextBlock_zNMGUCFdhKn5" style="font: 600 10pt/1.5 Arial, Helvetica, Sans-Serif; margin: 15px 42px 0px; color: #000000"&gt;
&lt;b&gt;Investments&lt;/b&gt;
&lt;/p&gt;

&lt;p style="font: 10pt/1.5 Arial, Helvetica, Sans-Serif; margin: 0px 42px 9px; color: #000000; font-weight: 300; text-align: left"&gt;
We invest mainly in common stocks (growth or value stocks or both) of large and midsize companies outside the United States that we believe have favorable investment potential. For example, we may purchase stocks of companies with stock prices that reflect a value lower than that which we place on the company. Under normal circumstances, we invest at least 80% of the fund&#x2019;s net&#160;assets in equity investments. This policy may be changed only after 60 days&#x2019; notice to shareholders. We may consider, among other factors, a company&#x2019;s valuation, financial strength, growth potential, competitive position in its industry, projected future earnings, cash flows and dividends when deciding whether to buy or sell investments. We may also consider other factors that we believe will cause the stock price to rise. We invest mainly in developed countries but may invest in emerging markets. We may also use derivatives, such as certain foreign currency transactions, futures, options, warrants and swap contracts, for both hedging and non-hedging purposes. For example, we typically use foreign currency forward contracts in connection with the fund&#x2019;s investments in foreign securities in order to hedge the fund&#x2019;s currency exposure relative to the fund&#x2019;s benchmark index.
&lt;/p&gt;

</rr:StrategyNarrativeTextBlock>
    <rr:RiskHeading
      contextRef="From2024-04-302024-04-30_custom_S000003877Member"
      id="Fact000926">Risks</rr:RiskHeading>
    <rr:RiskTextBlock
      contextRef="From2024-04-302024-04-30_custom_S000003877Member"
      id="Fact000927">&lt;p id="xdx_A84_err--RiskTextBlock_z1pbujJ0G9wk" style="font: 10pt/1.5 Arial, Helvetica, Sans-Serif; margin: 0px 42px 9px; color: #000000; font-weight: 300; text-align: left"&gt;
&lt;span id="xdx_906_err--RiskTextBlock_dU_c20240430__20240430__dei--LegalEntityAxis__custom--S000003877Member__rr--RiskAxis__rr--RiskLoseMoneyMember_zea6acesu77"&gt;It is important to understand that you can lose money by investing in the fund&lt;/span&gt;.
&lt;/p&gt;

&lt;p style="font: 10pt/1.5 Arial, Helvetica, Sans-Serif; margin: 0px 42px 9px; color: #000000; font-weight: 300; text-align: left"&gt;
The value of investments in the fund&#x2019;s portfolio may fall or fail to rise over extended periods of time for a variety of reasons, including general economic, political or financial market conditions, investor sentiment and market perceptions, government actions, geopolitical events or changes, outbreaks of infectious illnesses or other widespread public health issues, and factors related to a specific issuer, geography, industry or sector. These and other factors may lead to increased volatility and reduced liquidity in the fund&#x2019;s portfolio holdings, may negatively impact the fund&#x2019;s performance, and may exacerbate other risks to which the fund is subject. Growth stocks may be more susceptible to earnings disappointments, and value stocks may fail to rebound. These risks are generally greater for small and midsize companies. The value of international investments traded in foreign currencies may be adversely impacted by fluctuations in exchange rates. International investments, particularly investments in emerging markets, may carry risks associated with potentially less stable economies or governments (such as the risk of seizure by a foreign government, the imposition of currency or other restrictions, or high levels of inflation), and may be or become illiquid. 
&lt;/p&gt;

&lt;p style="font: 10pt/1.5 Arial, Helvetica, Sans-Serif; margin: 0px 42px 9px; color: #000000; font-weight: 300; text-align: left"&gt;
Investments focused in a single region may be affected by common economic forces and other factors. In addition, events in any one country within the region may impact the other countries or the region as a whole. Because the fund currently invests, and may in the future invest, significantly in European and Asian companies, the fund is particularly susceptible to economic, political, regulatory and other events or conditions affecting issuers in Europe and Asia. European financial markets have in recent years experienced increased volatility due to concerns with some countries&#x2019; high levels of sovereign debt, budget deficits, and unemployment. Asia includes countries in various stages of economic development, from emerging market economies to the highly developed economy of Japan. Some parts of Asia may be subject to a greater degree of economic, political and social instability than is the case in the United States.
&lt;/p&gt;



&lt;p&gt;
&lt;br/&gt;
&lt;br/&gt;
&lt;/p&gt;

&lt;div style="border-top: Black 1pt solid; margin: 18pt auto; font-size: 1pt"&gt;&#160;&lt;/div&gt;

&lt;p&gt;&lt;br/&gt;
&lt;br/&gt;
&lt;/p&gt;

&lt;p style="font: 10pt/1.5 Arial, Helvetica, Sans-Serif; margin: 0px 42px 9px; color: #000000; font-weight: 300; text-align: left"&gt;
Our use of derivatives may increase the risks of investing in the fund by increasing investment exposure (which may be considered leverage) or, in the case of many over-the-counter instruments, because of the potential inability to terminate or sell derivative positions and the potential failure of the other party to the instrument to meet its obligations. The risk of a party failing to meet its obligations may increase if the fund has significant exposure to that counterparty. The value of derivatives may move in unexpected ways due to unanticipated market movements, the use of leverage, imperfect correlation between the derivative instrument and the reference asset, or other factors, especially in unusual market conditions, and volatility in the value of derivatives could adversely impact the fund&#x2019;s returns, obligations and exposures. Derivatives are also subject to other risks, including liquidity risk (e.g., liquidity demands arising from the requirement to make payments to a derivative counterparty), operational risk (e.g., settlement issues or system failures), and legal risk (e.g., insufficient legal documentation or contract enforceability issues).
&lt;/p&gt;

&lt;p style="font: 10pt/1.5 Arial, Helvetica, Sans-Serif; margin: 0px 42px 9px; color: #000000; font-weight: 300; text-align: left"&gt;
There is no guarantee that the investment techniques, analyses, or judgments that we apply in making investment decisions for the fund will produce the intended outcome or that the investments we select for the fund will perform as well as other securities that were not selected for the fund. We, or the fund&#x2019;s other service providers, may experience disruptions or operating errors that could negatively impact the fund.
&lt;/p&gt;

&lt;p style="font: 10pt/1.5 Arial, Helvetica, Sans-Serif; margin: 0px 42px 9px; color: #000000; font-weight: 300; text-align: left"&gt;&lt;span style="-sec-ix-redline: true"&gt;The
fund may be an investment option for mutual funds that are managed by Franklin Resources, Inc. (Franklin Templeton) and its affiliates
as &#x201c;funds of funds&#x201d; and other investors with substantial investments in the fund. Such shareholders may at times be considered
to control the fund. Dispositions of a large number of shares by these shareholders may adversely affect the fund&#x2019;s liquidity and
net&#160;assets. These redemptions may also force the fund to sell securities, which may increase the fund&#x2019;s brokerage costs.&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt/1.5 Arial, Helvetica, Sans-Serif; margin: 0px 42px 9px; color: #000000; font-weight: 300; text-align: left"&gt;
The fund may not achieve its goal, and it is not intended to be a complete investment program. &lt;span id="xdx_907_err--RiskTextBlock_dU_c20240430__20240430__dei--LegalEntityAxis__custom--S000003877Member__rr--RiskAxis__rr--RiskNotInsuredDepositoryInstitutionMember_z1edhZUcZTlk"&gt;An investment in the fund is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency.&lt;/span&gt;
&lt;/p&gt;

</rr:RiskTextBlock>
    <rr:RiskTextBlock
      contextRef="From2024-04-302024-04-30_custom_S000003877Member_rr_RiskLoseMoneyMember"
      id="Fact000928">It is important to understand that you can lose money by investing in the fund</rr:RiskTextBlock>
    <rr:RiskTextBlock
      contextRef="From2024-04-302024-04-30_custom_S000003877Member_rr_RiskNotInsuredDepositoryInstitutionMember"
      id="Fact000930">An investment in the fund is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency.</rr:RiskTextBlock>
    <rr:BarChartAndPerformanceTableHeading
      contextRef="From2024-04-302024-04-30_custom_S000003877Member"
      id="Fact000931">Performance</rr:BarChartAndPerformanceTableHeading>
    <rr:PerformanceNarrativeTextBlock
      contextRef="From2024-04-302024-04-30_custom_S000003877Member"
      id="Fact000932">&lt;p id="xdx_A8A_err--PerformanceNarrativeTextBlock_zBuuTzjzCpo5" style="font: 10pt/1.5 Arial, Helvetica, Sans-Serif; margin: 0px 42px 9px; color: #000000; font-weight: 300; text-align: left"&gt;
&lt;span id="xdx_905_err--PerformanceInformationIllustratesVariabilityOfReturns_dU_c20240430__20240430__dei--LegalEntityAxis__custom--S000003877Member_zxIri9xZSn28"&gt;The performance information below gives some indication of the risks associated with an investment in the fund by showing the fund&#x2019;s performance year to year and over time.&lt;/span&gt; The performance information does not reflect insurance-related charges or expenses. If it did, performance would be lower. &lt;span id="xdx_90A_err--PerformancePastDoesNotIndicateFuture_dU_c20240430__20240430__dei--LegalEntityAxis__custom--S000003877Member_z45qdXgtFDrg"&gt;Please remember that past performance is not necessarily an indication of future results.&lt;/span&gt; 
&lt;/p&gt;

</rr:PerformanceNarrativeTextBlock>
    <rr:PerformanceInformationIllustratesVariabilityOfReturns
      contextRef="From2024-04-302024-04-30_custom_S000003877Member"
      id="Fact000933">The performance information below gives some indication of the risks associated with an investment in the fund by showing the fund&#x2019;s performance year to year and over time.</rr:PerformanceInformationIllustratesVariabilityOfReturns>
    <rr:PerformancePastDoesNotIndicateFuture
      contextRef="From2024-04-302024-04-30_custom_S000003877Member"
      id="Fact000934">Please remember that past performance is not necessarily an indication of future results.</rr:PerformancePastDoesNotIndicateFuture>
    <rr:BarChartHeading
      contextRef="From2024-04-302024-04-30_custom_S000003877Member"
      id="Fact000935">Annual total returns for class IA shares</rr:BarChartHeading>
    <rr:AnnualReturn2014
      contextRef="From2024-04-302024-04-30_custom_S000003877Member_custom_C000010849Member"
      decimals="INF"
      id="Fact000938"
      unitRef="Ratio">-0.0658</rr:AnnualReturn2014>
    <rr:AnnualReturn2015
      contextRef="From2024-04-302024-04-30_custom_S000003877Member_custom_C000010849Member"
      decimals="INF"
      id="Fact000940"
      unitRef="Ratio">0.0041</rr:AnnualReturn2015>
    <rr:AnnualReturn2016
      contextRef="From2024-04-302024-04-30_custom_S000003877Member_custom_C000010849Member"
      decimals="INF"
      id="Fact000942"
      unitRef="Ratio">-0.0221</rr:AnnualReturn2016>
    <rr:AnnualReturn2017
      contextRef="From2024-04-302024-04-30_custom_S000003877Member_custom_C000010849Member"
      decimals="INF"
      id="Fact000944"
      unitRef="Ratio">0.2693</rr:AnnualReturn2017>
    <rr:AnnualReturn2018
      contextRef="From2024-04-302024-04-30_custom_S000003877Member_custom_C000010849Member"
      decimals="INF"
      id="Fact000946"
      unitRef="Ratio">-0.1895</rr:AnnualReturn2018>
    <rr:AnnualReturn2019
      contextRef="From2024-04-302024-04-30_custom_S000003877Member_custom_C000010849Member"
      decimals="INF"
      id="Fact000948"
      unitRef="Ratio">0.2555</rr:AnnualReturn2019>
    <rr:AnnualReturn2020
      contextRef="From2024-04-302024-04-30_custom_S000003877Member_custom_C000010849Member"
      decimals="INF"
      id="Fact000950"
      unitRef="Ratio">0.1235</rr:AnnualReturn2020>
    <rr:AnnualReturn2021
      contextRef="From2024-04-302024-04-30_custom_S000003877Member_custom_C000010849Member"
      decimals="INF"
      id="Fact000952"
      unitRef="Ratio">0.0909</rr:AnnualReturn2021>
    <rr:AnnualReturn2022
      contextRef="From2024-04-302024-04-30_custom_S000003877Member_custom_C000010849Member"
      decimals="INF"
      id="Fact000954"
      unitRef="Ratio">-0.1458</rr:AnnualReturn2022>
    <rr:AnnualReturn2023
      contextRef="From2024-04-302024-04-30_custom_S000003877Member_custom_C000010849Member"
      decimals="INF"
      id="Fact000956"
      unitRef="Ratio">0.1886</rr:AnnualReturn2023>
    <rr:YearToDateReturnLabel
      contextRef="From2024-04-302024-04-30_custom_S000003877Member"
      id="Fact000957">Year-to-date performance
through</rr:YearToDateReturnLabel>
    <rr:BarChartYearToDateReturnDate
      contextRef="From2024-04-302024-04-30_custom_S000003877Member"
      id="Fact000958">2024-03-31</rr:BarChartYearToDateReturnDate>
    <rr:BarChartYearToDateReturn
      contextRef="From2024-04-302024-04-30_custom_S000003877Member"
      decimals="INF"
      id="Fact000959"
      unitRef="Ratio">0.0443</rr:BarChartYearToDateReturn>
    <rr:HighestQuarterlyReturnLabel
      contextRef="From2024-04-302024-04-30_custom_S000003877Member"
      id="Fact000960">Best calendar quarter</rr:HighestQuarterlyReturnLabel>
    <rr:BarChartHighestQuarterlyReturnDate
      contextRef="From2024-04-302024-04-30_custom_S000003877Member"
      id="Fact000961">2022-12-31</rr:BarChartHighestQuarterlyReturnDate>
    <rr:BarChartHighestQuarterlyReturn
      contextRef="From2024-04-302024-04-30_custom_S000003877Member"
      decimals="INF"
      id="Fact000962"
      unitRef="Ratio">0.1724</rr:BarChartHighestQuarterlyReturn>
    <rr:LowestQuarterlyReturnLabel
      contextRef="From2024-04-302024-04-30_custom_S000003877Member"
      id="Fact000963">Worst calendar quarter</rr:LowestQuarterlyReturnLabel>
    <rr:BarChartLowestQuarterlyReturnDate
      contextRef="From2024-04-302024-04-30_custom_S000003877Member"
      id="Fact000964">2020-03-31</rr:BarChartLowestQuarterlyReturnDate>
    <rr:BarChartLowestQuarterlyReturn
      contextRef="From2024-04-302024-04-30_custom_S000003877Member"
      decimals="INF"
      id="Fact000965"
      unitRef="Ratio">-0.2040</rr:BarChartLowestQuarterlyReturn>
    <rr:PerformanceTableHeading
      contextRef="From2024-04-302024-04-30_custom_S000003877Member"
      id="Fact000966">Average
annual total returns

(for
periods ended 12/31/23)</rr:PerformanceTableHeading>
    <rr:AverageAnnualReturnYear01
      contextRef="From2024-04-302024-04-30_custom_S000003877Member_custom_C000010849Member"
      decimals="INF"
      id="Fact000968"
      unitRef="Ratio">0.1886</rr:AverageAnnualReturnYear01>
    <rr:AverageAnnualReturnYear05
      contextRef="From2024-04-302024-04-30_custom_S000003877Member_custom_C000010849Member"
      decimals="INF"
      id="Fact000969"
      unitRef="Ratio">0.0933</rr:AverageAnnualReturnYear05>
    <rr:AverageAnnualReturnYear10
      contextRef="From2024-04-302024-04-30_custom_S000003877Member_custom_C000010849Member"
      decimals="INF"
      id="Fact000970"
      unitRef="Ratio">0.0396</rr:AverageAnnualReturnYear10>
    <rr:AverageAnnualReturnYear01
      contextRef="From2024-04-302024-04-30_custom_S000003877Member_custom_C000010850Member"
      decimals="INF"
      id="Fact000971"
      unitRef="Ratio">0.1851</rr:AverageAnnualReturnYear01>
    <rr:AverageAnnualReturnYear05
      contextRef="From2024-04-302024-04-30_custom_S000003877Member_custom_C000010850Member"
      decimals="INF"
      id="Fact000972"
      unitRef="Ratio">0.0905</rr:AverageAnnualReturnYear05>
    <rr:AverageAnnualReturnYear10
      contextRef="From2024-04-302024-04-30_custom_S000003877Member_custom_C000010850Member"
      decimals="INF"
      id="Fact000973"
      unitRef="Ratio">0.0370</rr:AverageAnnualReturnYear10>
    <rr:AverageAnnualReturnYear01
      contextRef="From2024-04-302024-04-30_custom_S000003877Member_custom_MSCIEAFEIndexMember"
      decimals="INF"
      id="Fact000974"
      unitRef="Ratio">0.1824</rr:AverageAnnualReturnYear01>
    <rr:AverageAnnualReturnYear05
      contextRef="From2024-04-302024-04-30_custom_S000003877Member_custom_MSCIEAFEIndexMember"
      decimals="INF"
      id="Fact000975"
      unitRef="Ratio">0.0816</rr:AverageAnnualReturnYear05>
    <rr:AverageAnnualReturnYear10
      contextRef="From2024-04-302024-04-30_custom_S000003877Member_custom_MSCIEAFEIndexMember"
      decimals="INF"
      id="Fact000976"
      unitRef="Ratio">0.0428</rr:AverageAnnualReturnYear10>
    <rr:PerformanceTableClosingTextBlock
      contextRef="From2024-04-302024-04-30_custom_S000003877Member"
      id="Fact000977">&lt;div id="xdx_A81_err--PerformanceTableClosingTextBlock_zchiOc6mCPqj"&gt;&lt;/div&gt;
&lt;table style="font: 300 9pt/1.5 Arial, Helvetica, Sans-Serif; margin-left: 10px; width: 90%"&gt;
&lt;tr style="vertical-align: top"&gt;
&lt;td style="width: 25px; text-align: right"&gt;&lt;/td&gt;
&lt;td&gt;&lt;span style="-sec-ix-redline: true"&gt;All MSCI indices are provided by MSCI.&lt;/span&gt;&lt;/td&gt;

&lt;/tr&gt;
&lt;/table&gt;

&lt;table style="font: 300 9pt/1.5 Arial, Helvetica, Sans-Serif; margin-left: 10px; width: 90%"&gt;
&lt;tr style="vertical-align: top"&gt;
&lt;td style="width: 25px; text-align: right"&gt;&lt;/td&gt;
&lt;td&gt;&lt;span style="-sec-ix-redline: true"&gt;MSCI makes no warranties and shall have no liability with respect to any MSCI data reproduced herein. No further redistribution
or use is permitted. This report is not prepared or endorsed by MSCI. Important data provider notices and terms available at www.franklintempletondatasources.com.
You cannot invest directly in an index.&lt;/span&gt;&lt;/td&gt;

&lt;/tr&gt;
&lt;/table&gt;

</rr:PerformanceTableClosingTextBlock>
    <rr:RiskReturnHeading
      contextRef="From2024-04-302024-04-30_custom_S000003878Member"
      id="Fact000979">Fund summary</rr:RiskReturnHeading>
    <rr:ObjectiveHeading
      contextRef="From2024-04-302024-04-30_custom_S000003878Member"
      id="Fact000980">Goal</rr:ObjectiveHeading>
    <rr:ObjectivePrimaryTextBlock
      contextRef="From2024-04-302024-04-30_custom_S000003878Member"
      id="Fact000981">&lt;p id="xdx_A87_err--ObjectivePrimaryTextBlock_zQBysSc0OEab" style="font: 10pt/1.5 Arial, Helvetica, Sans-Serif; margin: 0px 42px 9px; color: #000000; font-weight: 300; text-align: left"&gt;
Putnam VT International Value Fund seeks capital growth. Current income is a secondary objective.
&lt;/p&gt;

</rr:ObjectivePrimaryTextBlock>
    <rr:ExpenseHeading
      contextRef="From2024-04-302024-04-30_custom_S000003878Member"
      id="Fact000982">Fees and expenses</rr:ExpenseHeading>
    <rr:ExpenseNarrativeTextBlock
      contextRef="From2024-04-302024-04-30_custom_S000003878Member"
      id="Fact000983">&lt;p id="xdx_A89_err--ExpenseNarrativeTextBlock_zRwDSdZIR2Cb" style="font: 10pt/1.5 Arial, Helvetica, Sans-Serif; margin: 0px 42px 9px; color: #000000; font-weight: 300; text-align: left"&gt;
The following table describes the fees and expenses you may pay if you buy, hold and sell shares of the fund. You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in the tables and examples below. The fees and expenses information does not reflect insurance-related charges or expenses borne by contract holders indirectly investing in the fund. If it did, expenses would be higher.
&lt;/p&gt;

</rr:ExpenseNarrativeTextBlock>
    <rr:OperatingExpensesCaption
      contextRef="From2024-04-302024-04-30_custom_S000003878Member"
      id="Fact000984">
Annual fund operating expenses 



(expenses you pay each year as a percentage of the value of your investment)
</rr:OperatingExpensesCaption>
    <rr:ManagementFeesOverAssets
      contextRef="From2024-04-302024-04-30_custom_S000003878Member_custom_C000010851Member"
      decimals="INF"
      id="Fact000986"
      unitRef="Ratio">0.0069</rr:ManagementFeesOverAssets>
    <rr:DistributionAndService12b1FeesOverAssets
      contextRef="From2024-04-302024-04-30_custom_S000003878Member_custom_C000010851Member"
      decimals="INF"
      id="Fact000987"
      unitRef="Ratio">0</rr:DistributionAndService12b1FeesOverAssets>
    <rr:OtherExpensesOverAssets
      contextRef="From2024-04-302024-04-30_custom_S000003878Member_custom_C000010851Member"
      decimals="INF"
      id="Fact000988"
      unitRef="Ratio">0.0019</rr:OtherExpensesOverAssets>
    <rr:ExpensesOverAssets
      contextRef="From2024-04-302024-04-30_custom_S000003878Member_custom_C000010851Member"
      decimals="INF"
      id="Fact000989"
      unitRef="Ratio">0.0088</rr:ExpensesOverAssets>
    <rr:ManagementFeesOverAssets
      contextRef="From2024-04-302024-04-30_custom_S000003878Member_custom_C000010852Member"
      decimals="INF"
      id="Fact000990"
      unitRef="Ratio">0.0069</rr:ManagementFeesOverAssets>
    <rr:DistributionAndService12b1FeesOverAssets
      contextRef="From2024-04-302024-04-30_custom_S000003878Member_custom_C000010852Member"
      decimals="INF"
      id="Fact000991"
      unitRef="Ratio">0.0025</rr:DistributionAndService12b1FeesOverAssets>
    <rr:OtherExpensesOverAssets
      contextRef="From2024-04-302024-04-30_custom_S000003878Member_custom_C000010852Member"
      decimals="INF"
      id="Fact000992"
      unitRef="Ratio">0.0019</rr:OtherExpensesOverAssets>
    <rr:ExpensesOverAssets
      contextRef="From2024-04-302024-04-30_custom_S000003878Member_custom_C000010852Member"
      decimals="INF"
      id="Fact000993"
      unitRef="Ratio">0.0113</rr:ExpensesOverAssets>
    <rr:ExpenseExampleHeading
      contextRef="From2024-04-302024-04-30_custom_S000003878Member"
      id="Fact000994">Example</rr:ExpenseExampleHeading>
    <rr:ExpenseExampleNarrativeTextBlock
      contextRef="From2024-04-302024-04-30_custom_S000003878Member"
      id="Fact000995">&lt;p id="xdx_A8D_err--ExpenseExampleNarrativeTextBlock_zzc6wilEHhMf" style="font: 10pt/1.5 Arial, Helvetica, Sans-Serif; margin: 0px 42px 9px; color: #000000; font-weight: 300; text-align: left"&gt;
The following hypothetical example is intended to help you compare the cost of investing in the fund with the cost of investing in other funds. The example does not reflect insurance-related charges or expenses. If it did, expenses would be higher. It assumes that you invest $10,000 in the fund for the time periods indicated and then redeem or hold all your shares at the end of those periods. It assumes a 5% return on your investment each year and that the fund&#x2019;s operating expenses remain the same. Your actual costs may be higher or lower.
&lt;/p&gt;

</rr:ExpenseExampleNarrativeTextBlock>
    <rr:ExpenseExampleYear01
      contextRef="From2024-04-302024-04-30_custom_S000003878Member_custom_C000010851Member"
      decimals="0"
      id="Fact000997"
      unitRef="USD">90</rr:ExpenseExampleYear01>
    <rr:ExpenseExampleYear03
      contextRef="From2024-04-302024-04-30_custom_S000003878Member_custom_C000010851Member"
      decimals="0"
      id="Fact000998"
      unitRef="USD">281</rr:ExpenseExampleYear03>
    <rr:ExpenseExampleYear05
      contextRef="From2024-04-302024-04-30_custom_S000003878Member_custom_C000010851Member"
      decimals="0"
      id="Fact000999"
      unitRef="USD">488</rr:ExpenseExampleYear05>
    <rr:ExpenseExampleYear10
      contextRef="From2024-04-302024-04-30_custom_S000003878Member_custom_C000010851Member"
      decimals="0"
      id="Fact001000"
      unitRef="USD">1084</rr:ExpenseExampleYear10>
    <rr:ExpenseExampleYear01
      contextRef="From2024-04-302024-04-30_custom_S000003878Member_custom_C000010852Member"
      decimals="0"
      id="Fact001001"
      unitRef="USD">115</rr:ExpenseExampleYear01>
    <rr:ExpenseExampleYear03
      contextRef="From2024-04-302024-04-30_custom_S000003878Member_custom_C000010852Member"
      decimals="0"
      id="Fact001002"
      unitRef="USD">359</rr:ExpenseExampleYear03>
    <rr:ExpenseExampleYear05
      contextRef="From2024-04-302024-04-30_custom_S000003878Member_custom_C000010852Member"
      decimals="0"
      id="Fact001003"
      unitRef="USD">622</rr:ExpenseExampleYear05>
    <rr:ExpenseExampleYear10
      contextRef="From2024-04-302024-04-30_custom_S000003878Member_custom_C000010852Member"
      decimals="0"
      id="Fact001004"
      unitRef="USD">1375</rr:ExpenseExampleYear10>
    <rr:PortfolioTurnoverHeading
      contextRef="From2024-04-302024-04-30_custom_S000003878Member"
      id="Fact001005">Portfolio turnover</rr:PortfolioTurnoverHeading>
    <rr:PortfolioTurnoverTextBlock
      contextRef="From2024-04-302024-04-30_custom_S000003878Member"
      id="Fact001006">&lt;p id="xdx_A8F_err--PortfolioTurnoverTextBlock_zchDgiKYprna" style="font: 10pt/1.5 Arial, Helvetica, Sans-Serif; margin: 0px 42px 9px; color: #000000; font-weight: 300; text-align: left"&gt;&lt;span style="-sec-ix-redline: true"&gt;The
fund pays transaction-related costs, such as commissions, when it buys and sells securities (or &#x201c;turns over&#x201d; its portfolio).
A higher turnover rate may indicate higher transaction costs. These costs, which are not reflected in annual fund operating expenses
or the above example, affect fund performance. The fund&#x2019;s turnover rate in the most recent fiscal year was &lt;span id="xdx_90E_err--PortfolioTurnoverRate_dU_c20240430__20240430__dei--LegalEntityAxis__custom--S000003878Member_zvNeLe3pUe83"&gt;15%&lt;/span&gt;.&lt;/span&gt;&lt;/p&gt;

</rr:PortfolioTurnoverTextBlock>
    <rr:PortfolioTurnoverRate
      contextRef="From2024-04-302024-04-30_custom_S000003878Member"
      decimals="INF"
      id="Fact001007"
      unitRef="Ratio">0.15</rr:PortfolioTurnoverRate>
    <rr:StrategyHeading
      contextRef="From2024-04-302024-04-30_custom_S000003878Member"
      id="Fact001008">Investments, risks, and performance</rr:StrategyHeading>
    <rr:StrategyNarrativeTextBlock
      contextRef="From2024-04-302024-04-30_custom_S000003878Member"
      id="Fact001009">&lt;p id="xdx_A80_err--StrategyNarrativeTextBlock_zGYRIHG4UJ02" style="font: 600 10pt/1.5 Arial, Helvetica, Sans-Serif; margin: 15px 42px 0px; color: #000000"&gt;
&lt;b&gt;Investments&lt;/b&gt;
&lt;/p&gt;

&lt;p style="font: 10pt/1.5 Arial, Helvetica, Sans-Serif; margin: 0px 42px 9px; color: #000000; font-weight: 300; text-align: left"&gt;&lt;span style="-sec-ix-redline: true"&gt;We
invest mainly in common stocks of large and midsize companies outside the United States, with a focus on value stocks. Value stocks are
those that we believe are currently undervalued by the market. If we are correct and other investors ultimately recognize the value of
the company, the price of its stock may rise. We invest mainly in developed countries, but may invest in emerging markets. We may consider,
among other factors, a company&#x2019;s valuation, financial strength, growth potential, competitive position in its industry, projected
future earnings, cash flows and dividends when deciding whether to buy or sell investments. We may also use derivatives, such as certain
foreign currency transactions, futures, options, warrants and swap contracts, for both hedging and non-hedging purposes. For example,
we typically use foreign currency forward contracts in connection with the fund&#x2019;s investments in foreign securities in order to
hedge the fund&#x2019;s currency exposure relative to the fund&#x2019;s benchmark index.&lt;/span&gt;&lt;/p&gt;

</rr:StrategyNarrativeTextBlock>
    <rr:RiskHeading
      contextRef="From2024-04-302024-04-30_custom_S000003878Member"
      id="Fact001010">Risks</rr:RiskHeading>
    <rr:RiskTextBlock
      contextRef="From2024-04-302024-04-30_custom_S000003878Member"
      id="Fact001011">&lt;p id="xdx_A8C_err--RiskTextBlock_zDeOvqCbPgek" style="font: 10pt/1.5 Arial, Helvetica, Sans-Serif; margin: 0px 42px 9px; color: #000000; font-weight: 300; text-align: left"&gt;
&lt;span id="xdx_903_err--RiskTextBlock_dU_c20240430__20240430__dei--LegalEntityAxis__custom--S000003878Member__rr--RiskAxis__rr--RiskLoseMoneyMember_zXvOnTEqazw"&gt;It is important to understand that you can lose money by investing in the fund.&lt;/span&gt;
&lt;/p&gt;

&lt;p style="font: 10pt/1.5 Arial, Helvetica, Sans-Serif; margin: 0px 42px 9px; color: #000000; font-weight: 300; text-align: left"&gt;
The value of investments in the fund&#x2019;s portfolio may fall or fail to rise over extended periods of time for a variety of reasons, including general economic, political or financial market conditions, investor sentiment and market perceptions, government actions, geopolitical events or changes, outbreaks of infectious illnesses or other widespread public health issues, and factors related to a specific issuer, geography, industry or sector. These and other factors may lead to increased volatility and reduced liquidity in the fund&#x2019;s portfolio holdings, may negatively impact the fund&#x2019;s performance, and may exacerbate other risks to which the fund is subject. Value stocks may fail to rebound, and the market may not favor value-style investing. These risks are generally greater for small and midsize companies. From time to time, the fund may invest a significant portion of its assets in companies in one or more related industries or sectors, which would make the fund more vulnerable to adverse developments affecting those industries or sectors.
&lt;/p&gt;

&lt;p style="font: 10pt/1.5 Arial, Helvetica, Sans-Serif; margin: 0px 42px 9px; color: #000000; font-weight: 300; text-align: left"&gt;
The value of international investments traded in foreign currencies may be adversely impacted by fluctuations in exchange rates. International investments, particularly investments in emerging markets, may carry risks associated with potentially less stable economies or governments (such as the risk of seizure by a foreign government, the imposition of currency or other restrictions, or high levels of inflation), and may be or become illiquid.
&lt;/p&gt;

&lt;p style="font: 10pt/1.5 Arial, Helvetica, Sans-Serif; margin: 0px 42px 9px; color: #000000; font-weight: 300; text-align: left"&gt;
Investments focused in a single region may be affected by common economic forces and other factors. In addition, events in any one country within the region may impact the other countries or the region as a whole. Because the fund currently invests, and may in the future invest significantly in European and Asian companies, the fund is particularly susceptible to economic, political, regulatory and other events or conditions affecting issuers in Europe and Asia. European financial markets have in recent years experienced increased volatility due to concerns with some countries&#x2019; high levels of sovereign debt, budget deficits, and unemployment. Asia includes countries in various stages of economic development, from emerging market economies to the highly developed economy of Japan. Some parts of Asia may be subject to a greater degree of economic, political and social instability than is the case in the United States.
&lt;/p&gt;



&lt;p&gt;
&lt;br/&gt;
&lt;br/&gt;
&lt;/p&gt;

&lt;div style="border-top: Black 1pt solid; margin: 18pt auto; font-size: 1pt"&gt;&#160;&lt;/div&gt;

&lt;p&gt;&lt;br/&gt;
&lt;br/&gt;
&lt;/p&gt;

&lt;p style="font: 10pt/1.5 Arial, Helvetica, Sans-Serif; margin: 0px 42px 9px; color: #000000; font-weight: 300; text-align: left"&gt;
Our use of derivatives may increase the risks of investing in the fund by increasing investment exposure (which may be considered leverage) or, in the case of many over-the-counter instruments, because of the potential inability to terminate or sell derivative positions and the potential failure of the other party to the instrument to meet its obligations. The risk of a party failing to meet its obligations may increase if the fund has significant investment exposure to that counterparty. The value of derivatives may move in unexpected ways due to unanticipated market movements, the use of leverage, imperfect correlation between the derivative instrument and the reference asset, or other factors, especially in unusual market conditions, and volatility in the value of derivatives could adversely impact the fund&#x2019;s returns, obligations and exposures. Derivatives are also subject to other risks, including liquidity risk (e.g., liquidity demands arising from the requirement to make payments to a derivative counterparty), operational risk (e.g., settlement issues or system failures), and legal risk (e.g., insufficient legal documentation or contract enforceability issues).
&lt;/p&gt;

&lt;p style="font: 10pt/1.5 Arial, Helvetica, Sans-Serif; margin: 0px 42px 9px; color: #000000; font-weight: 300; text-align: left"&gt;
There is no guarantee that the investment techniques, analyses, or judgments that we apply in making investment decisions for the fund will produce the intended outcome or that the investments we select for the fund will perform as well as other securities that were not selected for the fund. We, or the fund&#x2019;s other service providers, may experience disruptions or operating errors that could negatively impact the fund.
&lt;/p&gt;

&lt;p style="font: 10pt/1.5 Arial, Helvetica, Sans-Serif; margin: 0px 42px 9px; color: #000000; font-weight: 300; text-align: left"&gt;&lt;span style="-sec-ix-redline: true"&gt;The
fund may be an investment option for mutual funds that are managed by Franklin Resources, Inc. (Franklin Templeton) and its affiliates
as &#x201c;funds of funds&#x201d; and other investors with substantial investments in the fund. Such shareholders may at times be considered
to control the fund. Dispositions of a large number of shares by these shareholders may adversely affect the fund&#x2019;s liquidity and
net&#160;assets. These redemptions may also force the fund to sell securities, which may increase the fund&#x2019;s brokerage&#160;costs.&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt/1.5 Arial, Helvetica, Sans-Serif; margin: 0px 42px 9px; color: #000000; font-weight: 300; text-align: left"&gt;
The fund may not achieve its goal, and it is not intended to be a complete investment program. &lt;span id="xdx_904_err--RiskTextBlock_dU_c20240430__20240430__dei--LegalEntityAxis__custom--S000003878Member__rr--RiskAxis__rr--RiskNotInsuredDepositoryInstitutionMember_zONEzAsX8I3a"&gt;An investment in the fund is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency.&lt;/span&gt;
&lt;/p&gt;

</rr:RiskTextBlock>
    <rr:RiskTextBlock
      contextRef="From2024-04-302024-04-30_custom_S000003878Member_rr_RiskLoseMoneyMember"
      id="Fact001012">It is important to understand that you can lose money by investing in the fund.</rr:RiskTextBlock>
    <rr:RiskTextBlock
      contextRef="From2024-04-302024-04-30_custom_S000003878Member_rr_RiskNotInsuredDepositoryInstitutionMember"
      id="Fact001014">An investment in the fund is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency.</rr:RiskTextBlock>
    <rr:BarChartAndPerformanceTableHeading
      contextRef="From2024-04-302024-04-30_custom_S000003878Member"
      id="Fact001015">Performance</rr:BarChartAndPerformanceTableHeading>
    <rr:PerformanceNarrativeTextBlock
      contextRef="From2024-04-302024-04-30_custom_S000003878Member"
      id="Fact001016">&lt;p id="xdx_A88_err--PerformanceNarrativeTextBlock_z979PQ1H1Q84" style="font: 10pt/1.5 Arial, Helvetica, Sans-Serif; margin: 0px 42px 9px; color: #000000; font-weight: 300; text-align: left"&gt;
&lt;span id="xdx_903_err--PerformanceInformationIllustratesVariabilityOfReturns_dU_c20240430__20240430__dei--LegalEntityAxis__custom--S000003878Member_zrWx4h15DDn6"&gt;The performance information below gives some indication of the risks associated with an investment in the fund by showing the fund&#x2019;s performance year to year and over time.&lt;/span&gt; The performance information does not reflect insurance-related charges or expenses. If it did, performance would be lower. &lt;span id="xdx_906_err--PerformancePastDoesNotIndicateFuture_dU_c20240430__20240430__dei--LegalEntityAxis__custom--S000003878Member_z8F8B8SWbGm2"&gt;Please remember that past performance is not necessarily an indication of future results.&lt;/span&gt; 
&lt;/p&gt;

</rr:PerformanceNarrativeTextBlock>
    <rr:PerformanceInformationIllustratesVariabilityOfReturns
      contextRef="From2024-04-302024-04-30_custom_S000003878Member"
      id="Fact001017">The performance information below gives some indication of the risks associated with an investment in the fund by showing the fund&#x2019;s performance year to year and over time.</rr:PerformanceInformationIllustratesVariabilityOfReturns>
    <rr:PerformancePastDoesNotIndicateFuture
      contextRef="From2024-04-302024-04-30_custom_S000003878Member"
      id="Fact001018">Please remember that past performance is not necessarily an indication of future results.</rr:PerformancePastDoesNotIndicateFuture>
    <rr:BarChartHeading
      contextRef="From2024-04-302024-04-30_custom_S000003878Member"
      id="Fact001019">Annual total returns for class IA shares</rr:BarChartHeading>
    <rr:AnnualReturn2014
      contextRef="From2024-04-302024-04-30_custom_S000003878Member_custom_C000010851Member"
      decimals="INF"
      id="Fact001022"
      unitRef="Ratio">-0.0929</rr:AnnualReturn2014>
    <rr:AnnualReturn2015
      contextRef="From2024-04-302024-04-30_custom_S000003878Member_custom_C000010851Member"
      decimals="INF"
      id="Fact001024"
      unitRef="Ratio">-0.0171</rr:AnnualReturn2015>
    <rr:AnnualReturn2016
      contextRef="From2024-04-302024-04-30_custom_S000003878Member_custom_C000010851Member"
      decimals="INF"
      id="Fact001026"
      unitRef="Ratio">0.0128</rr:AnnualReturn2016>
    <rr:AnnualReturn2017
      contextRef="From2024-04-302024-04-30_custom_S000003878Member_custom_C000010851Member"
      decimals="INF"
      id="Fact001028"
      unitRef="Ratio">0.2495</rr:AnnualReturn2017>
    <rr:AnnualReturn2018
      contextRef="From2024-04-302024-04-30_custom_S000003878Member_custom_C000010851Member"
      decimals="INF"
      id="Fact001030"
      unitRef="Ratio">-0.1731</rr:AnnualReturn2018>
    <rr:AnnualReturn2019
      contextRef="From2024-04-302024-04-30_custom_S000003878Member_custom_C000010851Member"
      decimals="INF"
      id="Fact001032"
      unitRef="Ratio">0.2044</rr:AnnualReturn2019>
    <rr:AnnualReturn2020
      contextRef="From2024-04-302024-04-30_custom_S000003878Member_custom_C000010851Member"
      decimals="INF"
      id="Fact001034"
      unitRef="Ratio">0.0423</rr:AnnualReturn2020>
    <rr:AnnualReturn2021
      contextRef="From2024-04-302024-04-30_custom_S000003878Member_custom_C000010851Member"
      decimals="INF"
      id="Fact001036"
      unitRef="Ratio">0.1528</rr:AnnualReturn2021>
    <rr:AnnualReturn2022
      contextRef="From2024-04-302024-04-30_custom_S000003878Member_custom_C000010851Member"
      decimals="INF"
      id="Fact001038"
      unitRef="Ratio">-0.0670</rr:AnnualReturn2022>
    <rr:AnnualReturn2023
      contextRef="From2024-04-302024-04-30_custom_S000003878Member_custom_C000010851Member"
      decimals="INF"
      id="Fact001040"
      unitRef="Ratio">0.1908</rr:AnnualReturn2023>
    <rr:YearToDateReturnLabel
      contextRef="From2024-04-302024-04-30_custom_S000003878Member"
      id="Fact001041">Year-to-date performance
through</rr:YearToDateReturnLabel>
    <rr:BarChartYearToDateReturnDate
      contextRef="From2024-04-302024-04-30_custom_S000003878Member"
      id="Fact001042">2024-03-31</rr:BarChartYearToDateReturnDate>
    <rr:BarChartYearToDateReturn
      contextRef="From2024-04-302024-04-30_custom_S000003878Member"
      decimals="INF"
      id="Fact001043"
      unitRef="Ratio">0.0475</rr:BarChartYearToDateReturn>
    <rr:HighestQuarterlyReturnLabel
      contextRef="From2024-04-302024-04-30_custom_S000003878Member"
      id="Fact001044">Best calendar quarter</rr:HighestQuarterlyReturnLabel>
    <rr:BarChartHighestQuarterlyReturnDate
      contextRef="From2024-04-302024-04-30_custom_S000003878Member"
      id="Fact001045">2002-12-31</rr:BarChartHighestQuarterlyReturnDate>
    <rr:BarChartHighestQuarterlyReturn
      contextRef="From2024-04-302024-04-30_custom_S000003878Member"
      decimals="INF"
      id="Fact001046"
      unitRef="Ratio">0.2160</rr:BarChartHighestQuarterlyReturn>
    <rr:LowestQuarterlyReturnLabel
      contextRef="From2024-04-302024-04-30_custom_S000003878Member"
      id="Fact001047">Worst calendar quarter</rr:LowestQuarterlyReturnLabel>
    <rr:BarChartLowestQuarterlyReturnDate
      contextRef="From2024-04-302024-04-30_custom_S000003878Member"
      id="Fact001048">2020-03-31</rr:BarChartLowestQuarterlyReturnDate>
    <rr:BarChartLowestQuarterlyReturn
      contextRef="From2024-04-302024-04-30_custom_S000003878Member"
      decimals="INF"
      id="Fact001049"
      unitRef="Ratio">-0.2558</rr:BarChartLowestQuarterlyReturn>
    <rr:PerformanceTableHeading
      contextRef="From2024-04-302024-04-30_custom_S000003878Member"
      id="Fact001050">
Average annual total returns



(for periods ended 12/31/23)
</rr:PerformanceTableHeading>
    <rr:AverageAnnualReturnYear01
      contextRef="From2024-04-302024-04-30_custom_S000003878Member_custom_C000010851Member"
      decimals="INF"
      id="Fact001052"
      unitRef="Ratio">0.1908</rr:AverageAnnualReturnYear01>
    <rr:AverageAnnualReturnYear05
      contextRef="From2024-04-302024-04-30_custom_S000003878Member_custom_C000010851Member"
      decimals="INF"
      id="Fact001053"
      unitRef="Ratio">0.0996</rr:AverageAnnualReturnYear05>
    <rr:AverageAnnualReturnYear10
      contextRef="From2024-04-302024-04-30_custom_S000003878Member_custom_C000010851Member"
      decimals="INF"
      id="Fact001054"
      unitRef="Ratio">0.0414</rr:AverageAnnualReturnYear10>
    <rr:AverageAnnualReturnYear01
      contextRef="From2024-04-302024-04-30_custom_S000003878Member_custom_C000010852Member"
      decimals="INF"
      id="Fact001055"
      unitRef="Ratio">0.1868</rr:AverageAnnualReturnYear01>
    <rr:AverageAnnualReturnYear05
      contextRef="From2024-04-302024-04-30_custom_S000003878Member_custom_C000010852Member"
      decimals="INF"
      id="Fact001056"
      unitRef="Ratio">0.0970</rr:AverageAnnualReturnYear05>
    <rr:AverageAnnualReturnYear10
      contextRef="From2024-04-302024-04-30_custom_S000003878Member_custom_C000010852Member"
      decimals="INF"
      id="Fact001057"
      unitRef="Ratio">0.0388</rr:AverageAnnualReturnYear10>
    <rr:AverageAnnualReturnYear01
      contextRef="From2024-04-302024-04-30_custom_S000003878Member_custom_MSCIEAFEValueIndexMember"
      decimals="INF"
      id="Fact001058"
      unitRef="Ratio">0.1895</rr:AverageAnnualReturnYear01>
    <rr:AverageAnnualReturnYear05
      contextRef="From2024-04-302024-04-30_custom_S000003878Member_custom_MSCIEAFEValueIndexMember"
      decimals="INF"
      id="Fact001059"
      unitRef="Ratio">0.0708</rr:AverageAnnualReturnYear05>
    <rr:AverageAnnualReturnYear10
      contextRef="From2024-04-302024-04-30_custom_S000003878Member_custom_MSCIEAFEValueIndexMember"
      decimals="INF"
      id="Fact001060"
      unitRef="Ratio">0.0316</rr:AverageAnnualReturnYear10>
    <rr:PerformanceTableClosingTextBlock
      contextRef="From2024-04-302024-04-30_custom_S000003878Member"
      id="Fact001061">&lt;div id="xdx_A8F_err--PerformanceTableClosingTextBlock_zjeGJiXT5gAd"&gt;&lt;/div&gt;
&lt;table style="font: 300 9pt/1.5 Arial, Helvetica, Sans-Serif; margin-left: 10px; width: 90%"&gt;
&lt;tr style="vertical-align: top"&gt;
&lt;td style="width: 25px; text-align: right"&gt;&lt;/td&gt;
&lt;td&gt;&lt;span style="-sec-ix-redline: true"&gt;All MSCI indices are provided by MSCI.&lt;/span&gt;&lt;/td&gt;

&lt;/tr&gt;
&lt;/table&gt;

&lt;table style="font: 300 9pt/1.5 Arial, Helvetica, Sans-Serif; margin-left: 10px; width: 90%"&gt;
&lt;tr style="vertical-align: top"&gt;
&lt;td style="width: 25px; text-align: right"&gt;&lt;/td&gt;
&lt;td&gt;&lt;span style="-sec-ix-redline: true"&gt;MSCI makes no warranties and shall have no liability with respect to any MSCI data reproduced herein. No further redistribution
or use is permitted. This report is not prepared or endorsed by MSCI. Important data provider notices and terms available at www.franklintempletondatasources.com.
You cannot invest directly in an index.&lt;/span&gt;&lt;/td&gt;

&lt;/tr&gt;
&lt;/table&gt;

</rr:PerformanceTableClosingTextBlock>
    <rr:RiskReturnHeading
      contextRef="From2024-04-302024-04-30_custom_S000003873Member"
      id="Fact001063">Fund summary</rr:RiskReturnHeading>
    <rr:ObjectiveHeading
      contextRef="From2024-04-302024-04-30_custom_S000003873Member"
      id="Fact001064">Goal</rr:ObjectiveHeading>
    <rr:ObjectivePrimaryTextBlock
      contextRef="From2024-04-302024-04-30_custom_S000003873Member"
      id="Fact001065">&lt;p id="xdx_A86_err--ObjectivePrimaryTextBlock_z9FhRJj4Qks1" style="font: 10pt/1.5 Arial, Helvetica, Sans-Serif; margin: 0px 42px 9px; color: #000000; font-weight: 300; text-align: left"&gt;
Putnam VT Large Cap Growth Fund seeks capital appreciation.
&lt;/p&gt;

</rr:ObjectivePrimaryTextBlock>
    <rr:ExpenseHeading
      contextRef="From2024-04-302024-04-30_custom_S000003873Member"
      id="Fact001066">Fees and expenses</rr:ExpenseHeading>
    <rr:ExpenseNarrativeTextBlock
      contextRef="From2024-04-302024-04-30_custom_S000003873Member"
      id="Fact001067">&lt;p id="xdx_A8D_err--ExpenseNarrativeTextBlock_zQBNYwvoNlt9" style="font: 10pt/1.5 Arial, Helvetica, Sans-Serif; margin: 0px 42px 9px; color: #000000; font-weight: 300; text-align: left"&gt;
The following table describes the fees and expenses you may pay if you buy, hold and sell shares of the fund. You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in the tables and examples below. The fees and expenses information does not reflect insurance-related charges or expenses borne by contract holders indirectly investing in the fund. If it did, expenses would be higher.
&lt;/p&gt;

</rr:ExpenseNarrativeTextBlock>
    <rr:OperatingExpensesCaption
      contextRef="From2024-04-302024-04-30_custom_S000003873Member"
      id="Fact001068">
Annual fund operating expenses



(expenses you pay each year as a percentage of the value of your investment)
</rr:OperatingExpensesCaption>
    <rr:ManagementFeesOverAssets
      contextRef="From2024-04-302024-04-30_custom_S000003873Member_custom_C000010841Member"
      decimals="INF"
      id="Fact001070"
      unitRef="Ratio">0.0055</rr:ManagementFeesOverAssets>
    <rr:DistributionAndService12b1FeesOverAssets
      contextRef="From2024-04-302024-04-30_custom_S000003873Member_custom_C000010841Member"
      decimals="INF"
      id="Fact001071"
      unitRef="Ratio">0</rr:DistributionAndService12b1FeesOverAssets>
    <rr:OtherExpensesOverAssets
      contextRef="From2024-04-302024-04-30_custom_S000003873Member_custom_C000010841Member"
      decimals="INF"
      id="Fact001072"
      unitRef="Ratio">0.0010</rr:OtherExpensesOverAssets>
    <rr:ExpensesOverAssets
      contextRef="From2024-04-302024-04-30_custom_S000003873Member_custom_C000010841Member"
      decimals="INF"
      id="Fact001073"
      unitRef="Ratio">0.0065</rr:ExpensesOverAssets>
    <rr:ManagementFeesOverAssets
      contextRef="From2024-04-302024-04-30_custom_S000003873Member_custom_C000010842Member"
      decimals="INF"
      id="Fact001074"
      unitRef="Ratio">0.0055</rr:ManagementFeesOverAssets>
    <rr:DistributionAndService12b1FeesOverAssets
      contextRef="From2024-04-302024-04-30_custom_S000003873Member_custom_C000010842Member"
      decimals="INF"
      id="Fact001075"
      unitRef="Ratio">0.0025</rr:DistributionAndService12b1FeesOverAssets>
    <rr:OtherExpensesOverAssets
      contextRef="From2024-04-302024-04-30_custom_S000003873Member_custom_C000010842Member"
      decimals="INF"
      id="Fact001076"
      unitRef="Ratio">0.0010</rr:OtherExpensesOverAssets>
    <rr:ExpensesOverAssets
      contextRef="From2024-04-302024-04-30_custom_S000003873Member_custom_C000010842Member"
      decimals="INF"
      id="Fact001077"
      unitRef="Ratio">0.0090</rr:ExpensesOverAssets>
    <rr:ExpenseExampleHeading
      contextRef="From2024-04-302024-04-30_custom_S000003873Member"
      id="Fact001078">Example</rr:ExpenseExampleHeading>
    <rr:ExpenseExampleNarrativeTextBlock
      contextRef="From2024-04-302024-04-30_custom_S000003873Member"
      id="Fact001079">&lt;p id="xdx_A8A_err--ExpenseExampleNarrativeTextBlock_zWLo91cfFD03" style="font: 10pt/1.5 Arial, Helvetica, Sans-Serif; margin: 0px 42px 9px; color: #000000; font-weight: 300; text-align: left"&gt;
The following hypothetical example is intended to help you compare the cost of investing in the fund with the cost of investing in other funds. The example does not reflect insurance-related charges or expenses. If it did, expenses would be higher. It assumes that you invest $10,000 in the fund for the time periods indicated and then redeem or hold all your shares at the end of those periods. It assumes a 5% return on your investment each year and that the fund&#x2019;s operating expenses remain the same. Your actual costs may be higher or lower.
&lt;/p&gt;

</rr:ExpenseExampleNarrativeTextBlock>
    <rr:ExpenseExampleYear01
      contextRef="From2024-04-302024-04-30_custom_S000003873Member_custom_C000010841Member"
      decimals="0"
      id="Fact001081"
      unitRef="USD">66</rr:ExpenseExampleYear01>
    <rr:ExpenseExampleYear03
      contextRef="From2024-04-302024-04-30_custom_S000003873Member_custom_C000010841Member"
      decimals="0"
      id="Fact001082"
      unitRef="USD">208</rr:ExpenseExampleYear03>
    <rr:ExpenseExampleYear05
      contextRef="From2024-04-302024-04-30_custom_S000003873Member_custom_C000010841Member"
      decimals="0"
      id="Fact001083"
      unitRef="USD">362</rr:ExpenseExampleYear05>
    <rr:ExpenseExampleYear10
      contextRef="From2024-04-302024-04-30_custom_S000003873Member_custom_C000010841Member"
      decimals="0"
      id="Fact001084"
      unitRef="USD">810</rr:ExpenseExampleYear10>
    <rr:ExpenseExampleYear01
      contextRef="From2024-04-302024-04-30_custom_S000003873Member_custom_C000010842Member"
      decimals="0"
      id="Fact001085"
      unitRef="USD">92</rr:ExpenseExampleYear01>
    <rr:ExpenseExampleYear03
      contextRef="From2024-04-302024-04-30_custom_S000003873Member_custom_C000010842Member"
      decimals="0"
      id="Fact001086"
      unitRef="USD">287</rr:ExpenseExampleYear03>
    <rr:ExpenseExampleYear05
      contextRef="From2024-04-302024-04-30_custom_S000003873Member_custom_C000010842Member"
      decimals="0"
      id="Fact001087"
      unitRef="USD">498</rr:ExpenseExampleYear05>
    <rr:ExpenseExampleYear10
      contextRef="From2024-04-302024-04-30_custom_S000003873Member_custom_C000010842Member"
      decimals="0"
      id="Fact001088"
      unitRef="USD">1108</rr:ExpenseExampleYear10>
    <rr:PortfolioTurnoverHeading
      contextRef="From2024-04-302024-04-30_custom_S000003873Member"
      id="Fact001089">Portfolio turnover</rr:PortfolioTurnoverHeading>
    <rr:PortfolioTurnoverTextBlock
      contextRef="From2024-04-302024-04-30_custom_S000003873Member"
      id="Fact001090">&lt;p id="xdx_A8D_err--PortfolioTurnoverTextBlock_zBy9BYoL8UWl" style="font: 10pt/1.5 Arial, Helvetica, Sans-Serif; margin: 0px 42px 9px; color: #000000; font-weight: 300; text-align: left"&gt;&lt;span style="-sec-ix-redline: true"&gt;The
fund pays transaction-related costs, such as commissions, when it buys and sells securities (or &#x201c;turns over&#x201d; its portfolio).
A higher turnover rate may indicate higher transaction costs. These costs, which are not reflected in annual fund operating expenses
or the above example, affect fund performance. The fund&#x2019;s turnover rate in the most recent fiscal year was &lt;span id="xdx_903_err--PortfolioTurnoverRate_dU_c20240430__20240430__dei--LegalEntityAxis__custom--S000003873Member_znyUpOHUmRS"&gt;31%&lt;/span&gt;.&lt;/span&gt;&lt;/p&gt;

</rr:PortfolioTurnoverTextBlock>
    <rr:PortfolioTurnoverRate
      contextRef="From2024-04-302024-04-30_custom_S000003873Member"
      decimals="INF"
      id="Fact001091"
      unitRef="Ratio">0.31</rr:PortfolioTurnoverRate>
    <rr:StrategyHeading
      contextRef="From2024-04-302024-04-30_custom_S000003873Member"
      id="Fact001092">Investments, risks, and performance</rr:StrategyHeading>
    <rr:StrategyNarrativeTextBlock
      contextRef="From2024-04-302024-04-30_custom_S000003873Member"
      id="Fact001093">&lt;p id="xdx_A88_err--StrategyNarrativeTextBlock_zPygs6DZEENc" style="font: 600 10pt/1.5 Arial, Helvetica, Sans-Serif; margin: 15px 42px 0px; color: #000000"&gt;
&lt;b&gt;Investments&lt;/b&gt;
&lt;/p&gt;

&lt;p style="font: 10pt/1.5 Arial, Helvetica, Sans-Serif; margin: 0px 42px 9px; color: #000000; font-weight: 300; text-align: left"&gt;
We invest mainly in common stocks of large U.S. companies, with a focus on growth stocks. Growth stocks are stocks of companies whose earnings are expected to grow faster than those of similar firms, and whose business growth and other characteristics may lead to an increase in stock price. We may consider, among other factors, a company&#x2019;s valuation, financial strength, growth potential, competitive position in its industry, projected future earnings, cash flows and dividends when deciding whether to buy or sell investments. Under normal circumstances, we invest at least 80% of the fund&#x2019;s net&#160;assets (plus the amount of any borrowings for investment purposes) in companies of a size similar to those in the Russell 1000 Growth Index. This policy may be changed only after 60 days&#x2019; notice to shareholders.
&lt;/p&gt;

&lt;p style="font: 10pt/1.5 Arial, Helvetica, Sans-Serif; margin: 0px 42px 9px; color: #000000; font-weight: 300; text-align: left"&gt;
The fund is &#x201c;non-diversified,&#x201d; which means it may invest in a greater percentage of its assets in fewer issuers than a &#x201c;diversified&#x201d; fund.
&lt;/p&gt;

</rr:StrategyNarrativeTextBlock>
    <rr:RiskHeading
      contextRef="From2024-04-302024-04-30_custom_S000003873Member"
      id="Fact001094">Risks</rr:RiskHeading>
    <rr:RiskTextBlock
      contextRef="From2024-04-302024-04-30_custom_S000003873Member"
      id="Fact001095">&lt;p id="xdx_A8E_err--RiskTextBlock_zcvBAv4EuNCg" style="font: 10pt/1.5 Arial, Helvetica, Sans-Serif; margin: 0px 42px 9px; color: #000000; font-weight: 300; text-align: left"&gt;
&lt;span id="xdx_90D_err--RiskTextBlock_dU_c20240430__20240430__dei--LegalEntityAxis__custom--S000003873Member__rr--RiskAxis__rr--RiskLoseMoneyMember_zWPrVNXhxXn3"&gt;It is important to understand that you can lose money by investing in the fund.&lt;/span&gt;
&lt;/p&gt;

&lt;p style="font: 10pt/1.5 Arial, Helvetica, Sans-Serif; margin: 0px 42px 9px; color: #000000; font-weight: 300; text-align: left"&gt;
The value of investments in the fund&#x2019;s portfolio may fall or fail to rise over extended periods of time for a variety of reasons, including general economic, political or financial market conditions, investor sentiment and market perceptions, government actions, geopolitical events or changes, outbreaks of infectious illnesses or other widespread public health issues, and factors related to a specific issuer, geography, industry or sector. These and other factors may lead to increased volatility and reduced liquidity in the fund&#x2019;s portfolio holdings, may negatively impact the fund&#x2019;s performance, and may exacerbate other risks to which the fund is subject. Companies whose stocks we believe are undervalued by the market may have experienced adverse business developments or may be subject to special risks that have caused their stocks to be out of favor. Growth stocks may be more susceptible to earnings disappointments, and the market may not favor growth-style investing. From time to time, the fund may invest a significant portion of its assets in companies in one or more related industries or sectors, which would make the fund more vulnerable to adverse developments affecting those companies, industries or sectors. For example, the fund may invest a significant portion of its assets in companies in the information technology sector that may be significantly affected by technological obsolescence or innovation, short product cycles, falling prices and profits, competitive pressures and general market conditions.
&lt;/p&gt;

&lt;p style="font: 10pt/1.5 Arial, Helvetica, Sans-Serif; margin: 0px 42px 9px; color: #000000; font-weight: 300; text-align: left"&gt;
&lt;span id="xdx_90F_err--RiskTextBlock_dU_c20240430__20240430__dei--LegalEntityAxis__custom--S000003873Member__rr--RiskAxis__rr--RiskNondiversifiedStatusMember_zAEWnDFBWuGk"&gt;As a non-diversified fund, the fund may invest in fewer issuers and is more vulnerable than a more broadly diversified fund to fluctuations in the values of the securities it holds.
&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt/1.5 Arial, Helvetica, Sans-Serif; margin: 0px 42px 9px; color: #000000; font-weight: 300; text-align: left"&gt;
There is no guarantee that the investment techniques, analyses, or judgments that we apply in making investment decisions for the fund will produce the intended outcome or that the investments we select for the fund will perform as well as other securities that were not selected for the fund. We, or the fund&#x2019;s other service providers, may experience disruptions or operating errors that could negatively impact the fund.
&lt;/p&gt;

&lt;p style="font: 10pt/1.5 Arial, Helvetica, Sans-Serif; margin: 0px 42px 9px; color: #000000; font-weight: 300; text-align: left"&gt;&lt;span style="-sec-ix-redline: true"&gt;The
fund may be an investment option for mutual funds that are managed by Franklin Resources, Inc. (Franklin Templeton) and its affiliates
as &#x201c;funds of funds&#x201d; and other investors with substantial investments in the fund. Such shareholders may at&lt;/span&gt;&lt;/p&gt;

&lt;table style="font: 12px Arial, Helvetica, Sans-Serif; margin: 36px 0 0 18px; width: 97%"&gt;
&lt;tr&gt;
&lt;td style="color: #000000; font-style: normal; font-variant: normal; font-weight: 300; line-height: 0.93; text-align: left; width: 90%"&gt;
2 &#160;&#160;&#160;&#160;Prospectus of the Trust&lt;/td&gt;
&lt;/tr&gt;
&lt;/table&gt;

&lt;p&gt;
&lt;br/&gt;
&lt;br/&gt;
&lt;/p&gt;

&lt;div style="border-top: Black 1pt solid; margin: 18pt auto; font-size: 1pt"&gt;&#160;&lt;/div&gt;

&lt;p&gt;&lt;br/&gt;
&lt;br/&gt;
&lt;/p&gt;

&lt;p style="font: 10pt/1.5 Arial, Helvetica, Sans-Serif; margin: 0px 42px 9px; color: #000000; font-weight: 300; text-align: left"&gt;&lt;span style="-sec-ix-redline: true"&gt;times
be considered to control the fund. Dispositions of a large number of shares by these shareholders may adversely affect the fund&#x2019;s
liquidity and net&#160;assets. These redemptions may also force the fund to sell securities, which may increase the fund&#x2019;s brokerage
costs.&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt/1.5 Arial, Helvetica, Sans-Serif; margin: 0px 42px 9px; color: #000000; font-weight: 300; text-align: left"&gt;
The fund may not achieve its goal, and it is not intended to be a complete investment program. &lt;span id="xdx_908_err--RiskTextBlock_dU_c20240430__20240430__dei--LegalEntityAxis__custom--S000003873Member__rr--RiskAxis__rr--RiskNotInsuredDepositoryInstitutionMember_zbsoMwoofh79"&gt;An investment in the fund is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency.&lt;/span&gt;
&lt;/p&gt;

</rr:RiskTextBlock>
    <rr:RiskTextBlock
      contextRef="From2024-04-302024-04-30_custom_S000003873Member_rr_RiskLoseMoneyMember"
      id="Fact001096">It is important to understand that you can lose money by investing in the fund.</rr:RiskTextBlock>
    <rr:RiskTextBlock
      contextRef="From2024-04-302024-04-30_custom_S000003873Member_rr_RiskNondiversifiedStatusMember"
      id="Fact001097">As a non-diversified fund, the fund may invest in fewer issuers and is more vulnerable than a more broadly diversified fund to fluctuations in the values of the securities it holds.
</rr:RiskTextBlock>
    <rr:RiskTextBlock
      contextRef="From2024-04-302024-04-30_custom_S000003873Member_rr_RiskNotInsuredDepositoryInstitutionMember"
      id="Fact001098">An investment in the fund is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency.</rr:RiskTextBlock>
    <rr:BarChartAndPerformanceTableHeading
      contextRef="From2024-04-302024-04-30_custom_S000003873Member"
      id="Fact001099">Performance</rr:BarChartAndPerformanceTableHeading>
    <rr:PerformanceNarrativeTextBlock
      contextRef="From2024-04-302024-04-30_custom_S000003873Member"
      id="Fact001100">&lt;p id="xdx_A85_err--PerformanceNarrativeTextBlock_zOC2yidfG6x4" style="font: 10pt/1.5 Arial, Helvetica, Sans-Serif; margin: 0px 42px 9px; color: #000000; font-weight: 300; text-align: left"&gt;
&lt;span id="xdx_904_err--PerformanceInformationIllustratesVariabilityOfReturns_dU_c20240430__20240430__dei--LegalEntityAxis__custom--S000003873Member_zEUV8kX0irOl"&gt;The performance information below gives some indication of the risks associated with an investment in the fund by showing the fund&#x2019;s performance year to year and over time.&lt;/span&gt; The performance information does not reflect insurance-related charges or expenses. If it did, performance would be lower. &lt;span id="xdx_90B_err--PerformancePastDoesNotIndicateFuture_dU_c20240430__20240430__dei--LegalEntityAxis__custom--S000003873Member_zJHWCLMcuGh6"&gt;Please remember that past performance is not necessarily an indication of future results.&lt;/span&gt; 
&lt;/p&gt;

</rr:PerformanceNarrativeTextBlock>
    <rr:PerformanceInformationIllustratesVariabilityOfReturns
      contextRef="From2024-04-302024-04-30_custom_S000003873Member"
      id="Fact001101">The performance information below gives some indication of the risks associated with an investment in the fund by showing the fund&#x2019;s performance year to year and over time.</rr:PerformanceInformationIllustratesVariabilityOfReturns>
    <rr:PerformancePastDoesNotIndicateFuture
      contextRef="From2024-04-302024-04-30_custom_S000003873Member"
      id="Fact001102">Please remember that past performance is not necessarily an indication of future results.</rr:PerformancePastDoesNotIndicateFuture>
    <rr:BarChartHeading
      contextRef="From2024-04-302024-04-30_custom_S000003873Member"
      id="Fact001103">Annual total returns for class IA shares</rr:BarChartHeading>
    <rr:AnnualReturn2014
      contextRef="From2024-04-302024-04-30_custom_S000003873Member_custom_C000010841Member"
      decimals="INF"
      id="Fact001106"
      unitRef="Ratio">0.1416</rr:AnnualReturn2014>
    <rr:AnnualReturn2015
      contextRef="From2024-04-302024-04-30_custom_S000003873Member_custom_C000010841Member"
      decimals="INF"
      id="Fact001108"
      unitRef="Ratio">0.0128</rr:AnnualReturn2015>
    <rr:AnnualReturn2016
      contextRef="From2024-04-302024-04-30_custom_S000003873Member_custom_C000010841Member"
      decimals="INF"
      id="Fact001110"
      unitRef="Ratio">0.0672</rr:AnnualReturn2016>
    <rr:AnnualReturn2017
      contextRef="From2024-04-302024-04-30_custom_S000003873Member_custom_C000010841Member"
      decimals="INF"
      id="Fact001112"
      unitRef="Ratio">0.3130</rr:AnnualReturn2017>
    <rr:AnnualReturn2018
      contextRef="From2024-04-302024-04-30_custom_S000003873Member_custom_C000010841Member"
      decimals="INF"
      id="Fact001114"
      unitRef="Ratio">0.0260</rr:AnnualReturn2018>
    <rr:AnnualReturn2019
      contextRef="From2024-04-302024-04-30_custom_S000003873Member_custom_C000010841Member"
      decimals="INF"
      id="Fact001116"
      unitRef="Ratio">0.3711</rr:AnnualReturn2019>
    <rr:AnnualReturn2020
      contextRef="From2024-04-302024-04-30_custom_S000003873Member_custom_C000010841Member"
      decimals="INF"
      id="Fact001118"
      unitRef="Ratio">0.3909</rr:AnnualReturn2020>
    <rr:AnnualReturn2021
      contextRef="From2024-04-302024-04-30_custom_S000003873Member_custom_C000010841Member"
      decimals="INF"
      id="Fact001120"
      unitRef="Ratio">0.2300</rr:AnnualReturn2021>
    <rr:AnnualReturn2022
      contextRef="From2024-04-302024-04-30_custom_S000003873Member_custom_C000010841Member"
      decimals="INF"
      id="Fact001122"
      unitRef="Ratio">-0.3036</rr:AnnualReturn2022>
    <rr:AnnualReturn2023
      contextRef="From2024-04-302024-04-30_custom_S000003873Member_custom_C000010841Member"
      decimals="INF"
      id="Fact001124"
      unitRef="Ratio">0.4489</rr:AnnualReturn2023>
    <rr:YearToDateReturnLabel
      contextRef="From2024-04-302024-04-30_custom_S000003873Member"
      id="Fact001125">Year-to-date performance
through</rr:YearToDateReturnLabel>
    <rr:BarChartYearToDateReturnDate
      contextRef="From2024-04-302024-04-30_custom_S000003873Member"
      id="Fact001126">2024-03-31</rr:BarChartYearToDateReturnDate>
    <rr:BarChartYearToDateReturn
      contextRef="From2024-04-302024-04-30_custom_S000003873Member"
      decimals="INF"
      id="Fact001127"
      unitRef="Ratio">0.1250</rr:BarChartYearToDateReturn>
    <rr:HighestQuarterlyReturnLabel
      contextRef="From2024-04-302024-04-30_custom_S000003873Member"
      id="Fact001128">Best calendar quarter</rr:HighestQuarterlyReturnLabel>
    <rr:BarChartHighestQuarterlyReturnDate
      contextRef="From2024-04-302024-04-30_custom_S000003873Member"
      id="Fact001129">2020-06-30</rr:BarChartHighestQuarterlyReturnDate>
    <rr:BarChartHighestQuarterlyReturn
      contextRef="From2024-04-302024-04-30_custom_S000003873Member"
      decimals="INF"
      id="Fact001130"
      unitRef="Ratio">0.2883</rr:BarChartHighestQuarterlyReturn>
    <rr:LowestQuarterlyReturnLabel
      contextRef="From2024-04-302024-04-30_custom_S000003873Member"
      id="Fact001131">Worst calendar quarter</rr:LowestQuarterlyReturnLabel>
    <rr:BarChartLowestQuarterlyReturnDate
      contextRef="From2024-04-302024-04-30_custom_S000003873Member"
      id="Fact001132">2022-06-30</rr:BarChartLowestQuarterlyReturnDate>
    <rr:BarChartLowestQuarterlyReturn
      contextRef="From2024-04-302024-04-30_custom_S000003873Member"
      decimals="INF"
      id="Fact001133"
      unitRef="Ratio">-0.2206</rr:BarChartLowestQuarterlyReturn>
    <rr:PerformanceTableHeading
      contextRef="From2024-04-302024-04-30_custom_S000003873Member"
      id="Fact001134">Average annual total returns

(for
periods ended 12/31/23)</rr:PerformanceTableHeading>
    <rr:AverageAnnualReturnYear01
      contextRef="From2024-04-302024-04-30_custom_S000003873Member_custom_C000010841Member"
      decimals="INF"
      id="Fact001136"
      unitRef="Ratio">0.4489</rr:AverageAnnualReturnYear01>
    <rr:AverageAnnualReturnYear05
      contextRef="From2024-04-302024-04-30_custom_S000003873Member_custom_C000010841Member"
      decimals="INF"
      id="Fact001137"
      unitRef="Ratio">0.1880</rr:AverageAnnualReturnYear05>
    <rr:AverageAnnualReturnYear10
      contextRef="From2024-04-302024-04-30_custom_S000003873Member_custom_C000010841Member"
      decimals="INF"
      id="Fact001138"
      unitRef="Ratio">0.1468</rr:AverageAnnualReturnYear10>
    <rr:AverageAnnualReturnYear01
      contextRef="From2024-04-302024-04-30_custom_S000003873Member_custom_C000010842Member"
      decimals="INF"
      id="Fact001139"
      unitRef="Ratio">0.4447</rr:AverageAnnualReturnYear01>
    <rr:AverageAnnualReturnYear05
      contextRef="From2024-04-302024-04-30_custom_S000003873Member_custom_C000010842Member"
      decimals="INF"
      id="Fact001140"
      unitRef="Ratio">0.1849</rr:AverageAnnualReturnYear05>
    <rr:AverageAnnualReturnYear10
      contextRef="From2024-04-302024-04-30_custom_S000003873Member_custom_C000010842Member"
      decimals="INF"
      id="Fact001141"
      unitRef="Ratio">0.1439</rr:AverageAnnualReturnYear10>
    <rr:AverageAnnualReturnYear01
      contextRef="From2024-04-302024-04-30_custom_S000003873Member_custom_Russell1000GrowthIndexMember"
      decimals="INF"
      id="Fact001142"
      unitRef="Ratio">0.4268</rr:AverageAnnualReturnYear01>
    <rr:AverageAnnualReturnYear05
      contextRef="From2024-04-302024-04-30_custom_S000003873Member_custom_Russell1000GrowthIndexMember"
      decimals="INF"
      id="Fact001143"
      unitRef="Ratio">0.1950</rr:AverageAnnualReturnYear05>
    <rr:AverageAnnualReturnYear10
      contextRef="From2024-04-302024-04-30_custom_S000003873Member_custom_Russell1000GrowthIndexMember"
      decimals="INF"
      id="Fact001144"
      unitRef="Ratio">0.1486</rr:AverageAnnualReturnYear10>
    <rr:PerformanceTableClosingTextBlock
      contextRef="From2024-04-302024-04-30_custom_S000003873Member"
      id="Fact001145">&lt;div id="xdx_A8A_err--PerformanceTableClosingTextBlock_znRQONzIQfR9"&gt;&lt;/div&gt;
&lt;table style="font: 300 9pt/1.5 Arial, Helvetica, Sans-Serif; margin-left: 10px; width: 90%"&gt;
&lt;tr style="vertical-align: top"&gt;
&lt;td style="width: 25px; text-align: right"&gt;&lt;/td&gt;
&lt;td&gt;&lt;span style="-sec-ix-redline: true"&gt;Frank Russell Company is the source and owner of the trademarks, service marks and copyrights related to the Russell Indexes.
Russell&#xae; is a trademark of Frank Russell Company.&lt;/span&gt;&lt;/td&gt;

&lt;/tr&gt;
&lt;/table&gt;

</rr:PerformanceTableClosingTextBlock>
    <rr:RiskReturnHeading
      contextRef="From2024-04-302024-04-30_custom_S000003894Member"
      id="Fact001147">Fund summary</rr:RiskReturnHeading>
    <rr:ObjectiveHeading
      contextRef="From2024-04-302024-04-30_custom_S000003894Member"
      id="Fact001148">Goal</rr:ObjectiveHeading>
    <rr:ObjectivePrimaryTextBlock
      contextRef="From2024-04-302024-04-30_custom_S000003894Member"
      id="Fact001149">&lt;p id="xdx_A86_err--ObjectivePrimaryTextBlock_zMQK61Ug1Ss2" style="font: 10pt/1.5 Arial, Helvetica, Sans-Serif; margin: 0px 42px 9px; color: #000000; font-weight: 300; text-align: left"&gt;
Putnam VT Large Cap Value Fund seeks capital growth and current income.
&lt;/p&gt;

</rr:ObjectivePrimaryTextBlock>
    <rr:ExpenseHeading
      contextRef="From2024-04-302024-04-30_custom_S000003894Member"
      id="Fact001150">Fees and expenses</rr:ExpenseHeading>
    <rr:ExpenseNarrativeTextBlock
      contextRef="From2024-04-302024-04-30_custom_S000003894Member"
      id="Fact001151">&lt;p id="xdx_A8F_err--ExpenseNarrativeTextBlock_zDldSQocQ5j6" style="font: 10pt/1.5 Arial, Helvetica, Sans-Serif; margin: 0px 42px 9px; color: #000000; font-weight: 300; text-align: left"&gt;
The following table describes the fees and expenses you may pay if you buy, hold and sell shares of the fund. You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in the tables and examples below. The fees and expenses information does not reflect insurance-related charges or expenses borne by contract holders indirectly investing in the fund. If it did, expenses would be higher.
&lt;/p&gt;

</rr:ExpenseNarrativeTextBlock>
    <rr:OperatingExpensesCaption
      contextRef="From2024-04-302024-04-30_custom_S000003894Member"
      id="Fact001152">
Annual fund operating expenses 



(expenses you pay each year as a percentage of the value of your investment)
</rr:OperatingExpensesCaption>
    <rr:ManagementFeesOverAssets
      contextRef="From2024-04-302024-04-30_custom_S000003894Member_custom_C000010883Member"
      decimals="INF"
      id="Fact001154"
      unitRef="Ratio">0.0047</rr:ManagementFeesOverAssets>
    <rr:DistributionAndService12b1FeesOverAssets
      contextRef="From2024-04-302024-04-30_custom_S000003894Member_custom_C000010883Member"
      decimals="INF"
      id="Fact001155"
      unitRef="Ratio">0</rr:DistributionAndService12b1FeesOverAssets>
    <rr:OtherExpensesOverAssets
      contextRef="From2024-04-302024-04-30_custom_S000003894Member_custom_C000010883Member"
      decimals="INF"
      id="Fact001156"
      unitRef="Ratio">0.0010</rr:OtherExpensesOverAssets>
    <rr:ExpensesOverAssets
      contextRef="From2024-04-302024-04-30_custom_S000003894Member_custom_C000010883Member"
      decimals="INF"
      id="Fact001157"
      unitRef="Ratio">0.0057</rr:ExpensesOverAssets>
    <rr:ManagementFeesOverAssets
      contextRef="From2024-04-302024-04-30_custom_S000003894Member_custom_C000010884Member"
      decimals="INF"
      id="Fact001158"
      unitRef="Ratio">0.0047</rr:ManagementFeesOverAssets>
    <rr:DistributionAndService12b1FeesOverAssets
      contextRef="From2024-04-302024-04-30_custom_S000003894Member_custom_C000010884Member"
      decimals="INF"
      id="Fact001159"
      unitRef="Ratio">0.0025</rr:DistributionAndService12b1FeesOverAssets>
    <rr:OtherExpensesOverAssets
      contextRef="From2024-04-302024-04-30_custom_S000003894Member_custom_C000010884Member"
      decimals="INF"
      id="Fact001160"
      unitRef="Ratio">0.0010</rr:OtherExpensesOverAssets>
    <rr:ExpensesOverAssets
      contextRef="From2024-04-302024-04-30_custom_S000003894Member_custom_C000010884Member"
      decimals="INF"
      id="Fact001161"
      unitRef="Ratio">0.0082</rr:ExpensesOverAssets>
    <rr:ExpenseExampleHeading
      contextRef="From2024-04-302024-04-30_custom_S000003894Member"
      id="Fact001162">Example</rr:ExpenseExampleHeading>
    <rr:ExpenseExampleNarrativeTextBlock
      contextRef="From2024-04-302024-04-30_custom_S000003894Member"
      id="Fact001163">&lt;p id="xdx_A8F_err--ExpenseExampleNarrativeTextBlock_ze96LdJuRKnf" style="font: 10pt/1.5 Arial, Helvetica, Sans-Serif; margin: 0px 42px 9px; color: #000000; font-weight: 300; text-align: left"&gt;
The following hypothetical example is intended to help you compare the cost of investing in the fund with the cost of investing in other funds. The example does not reflect insurance-related charges or expenses. If it did, expenses would be higher. It assumes that you invest $10,000 in the fund for the time periods indicated and then redeem or hold all your shares at the end of those periods. It assumes a 5% return on your investment each year and that the fund&#x2019;s operating expenses remain the same. Your actual costs may be higher or lower.
&lt;/p&gt;

</rr:ExpenseExampleNarrativeTextBlock>
    <rr:ExpenseExampleYear01
      contextRef="From2024-04-302024-04-30_custom_S000003894Member_custom_C000010883Member"
      decimals="0"
      id="Fact001165"
      unitRef="USD">58</rr:ExpenseExampleYear01>
    <rr:ExpenseExampleYear03
      contextRef="From2024-04-302024-04-30_custom_S000003894Member_custom_C000010883Member"
      decimals="0"
      id="Fact001166"
      unitRef="USD">183</rr:ExpenseExampleYear03>
    <rr:ExpenseExampleYear05
      contextRef="From2024-04-302024-04-30_custom_S000003894Member_custom_C000010883Member"
      decimals="0"
      id="Fact001167"
      unitRef="USD">318</rr:ExpenseExampleYear05>
    <rr:ExpenseExampleYear10
      contextRef="From2024-04-302024-04-30_custom_S000003894Member_custom_C000010883Member"
      decimals="0"
      id="Fact001168"
      unitRef="USD">714</rr:ExpenseExampleYear10>
    <rr:ExpenseExampleYear01
      contextRef="From2024-04-302024-04-30_custom_S000003894Member_custom_C000010884Member"
      decimals="0"
      id="Fact001169"
      unitRef="USD">84</rr:ExpenseExampleYear01>
    <rr:ExpenseExampleYear03
      contextRef="From2024-04-302024-04-30_custom_S000003894Member_custom_C000010884Member"
      decimals="0"
      id="Fact001170"
      unitRef="USD">262</rr:ExpenseExampleYear03>
    <rr:ExpenseExampleYear05
      contextRef="From2024-04-302024-04-30_custom_S000003894Member_custom_C000010884Member"
      decimals="0"
      id="Fact001171"
      unitRef="USD">455</rr:ExpenseExampleYear05>
    <rr:ExpenseExampleYear10
      contextRef="From2024-04-302024-04-30_custom_S000003894Member_custom_C000010884Member"
      decimals="0"
      id="Fact001172"
      unitRef="USD">1014</rr:ExpenseExampleYear10>
    <rr:PortfolioTurnoverHeading
      contextRef="From2024-04-302024-04-30_custom_S000003894Member"
      id="Fact001173">Portfolio turnover</rr:PortfolioTurnoverHeading>
    <rr:PortfolioTurnoverTextBlock
      contextRef="From2024-04-302024-04-30_custom_S000003894Member"
      id="Fact001174">&lt;p id="xdx_A84_err--PortfolioTurnoverTextBlock_zStpRrbwwWle" style="font: 10pt/1.5 Arial, Helvetica, Sans-Serif; margin: 0px 42px 9px; color: #000000; font-weight: 300; text-align: left"&gt;&lt;span style="-sec-ix-redline: true"&gt;The
fund pays transaction-related costs, such as commissions, when it buys and sells securities (or &#x201c;turns over&#x201d; its portfolio).
A higher turnover rate may indicate higher transaction costs. These costs, which are not reflected in annual fund operating expenses
or the above example, affect fund performance. The fund&#x2019;s turnover rate in the most recent fiscal year was &lt;span id="xdx_903_err--PortfolioTurnoverRate_dU_c20240430__20240430__dei--LegalEntityAxis__custom--S000003894Member_zIBqPHhoMct9"&gt;20%&lt;/span&gt;.&lt;/span&gt;&lt;/p&gt;

</rr:PortfolioTurnoverTextBlock>
    <rr:PortfolioTurnoverRate
      contextRef="From2024-04-302024-04-30_custom_S000003894Member"
      decimals="INF"
      id="Fact001175"
      unitRef="Ratio">0.20</rr:PortfolioTurnoverRate>
    <rr:StrategyHeading
      contextRef="From2024-04-302024-04-30_custom_S000003894Member"
      id="Fact001176">Investments, risks, and performance</rr:StrategyHeading>
    <rr:StrategyNarrativeTextBlock
      contextRef="From2024-04-302024-04-30_custom_S000003894Member"
      id="Fact001177">&lt;p id="xdx_A85_err--StrategyNarrativeTextBlock_zi0W676h0dY8" style="font: 600 10pt/1.5 Arial, Helvetica, Sans-Serif; margin: 15px 42px 0px; color: #000000"&gt;
&lt;b&gt;Investments&lt;/b&gt;
&lt;/p&gt;

&lt;p style="font: 10pt/1.5 Arial, Helvetica, Sans-Serif; margin: 0px 42px 9px; color: #000000; font-weight: 300; text-align: left"&gt;&lt;span style="-sec-ix-redline: true"&gt;We
invest mainly in common stocks of U.S. companies, with a focus on value stocks that offer the potential for capital growth, current income,
or both. Under normal circumstances, we invest at least 80% of the fund&#x2019;s net&#160;assets in large-cap companies, which, for purposes
of this policy, are of a size similar to those in the Russell 1000 Value Index. This policy may be changed only after 60 days&#x2019;
notice to shareholders. As of March 31, 2024, the index was composed of companies having market capitalizations of between approximately
$351.9 million to $908.9 billion. We may also invest in midsize companies. Value stocks are issued by companies that we believe are currently
undervalued by the market. If we are correct and other investors ultimately recognize the value of the company, the price of its stock
may rise. We may consider, among other factors, a company&#x2019;s valuation, financial strength, growth potential, competitive position
in its industry, projected future earnings, cash flows and dividends when deciding whether to buy or sell investments.&lt;/span&gt;&lt;/p&gt;

</rr:StrategyNarrativeTextBlock>
    <rr:RiskHeading
      contextRef="From2024-04-302024-04-30_custom_S000003894Member"
      id="Fact001178">Risks</rr:RiskHeading>
    <rr:RiskTextBlock
      contextRef="From2024-04-302024-04-30_custom_S000003894Member"
      id="Fact001179">&lt;p id="xdx_A8A_err--RiskTextBlock_zE5EIDGpYndd" style="font: 10pt/1.5 Arial, Helvetica, Sans-Serif; margin: 0px 42px 9px; color: #000000; font-weight: 300; text-align: left"&gt;
&lt;span id="xdx_908_err--RiskTextBlock_dU_c20240430__20240430__dei--LegalEntityAxis__custom--S000003894Member__rr--RiskAxis__rr--RiskLoseMoneyMember_zoOo6pfzKJib"&gt;It is important to understand that you can lose money by investing in the fund.&lt;/span&gt;
&lt;/p&gt;

&lt;p style="font: 10pt/1.5 Arial, Helvetica, Sans-Serif; margin: 0px 42px 9px; color: #000000; font-weight: 300; text-align: left"&gt;
The value of investments in the fund&#x2019;s portfolio may fall or fail to rise over extended periods of time for a variety of reasons, including general economic, political or financial market conditions, investor sentiment and market perceptions, government actions, geopolitical events or changes, outbreaks of infectious illnesses or other widespread public health issues, and factors related to a specific issuer, geography, industry or sector. These and other factors may lead to increased volatility and reduced liquidity in the fund&#x2019;s portfolio holdings, may negatively impact the fund&#x2019;s performance, and may exacerbate other risks to which the fund is subject. Companies whose stocks we believe are undervalued by the market may have experienced adverse business developments or may be subject to special risks that have caused their stocks to be out of favor. Value stocks may fail to rebound, and the market may not favor value-style investing. Income provided by the fund may be reduced by changes in the dividend policies of, and the capital resources available at, the companies in which the fund invests.
&lt;/p&gt;

&lt;p style="font: 10pt/1.5 Arial, Helvetica, Sans-Serif; margin: 0px 42px 9px; color: #000000; font-weight: 300; text-align: left"&gt;
There is no guarantee that the investment techniques, analyses, or judgments that we apply in making investment decisions for the fund will produce the intended outcome or that the investments we select for the fund will perform as well as other securities that were not selected for the fund. We, or the fund&#x2019;s other service providers, may experience disruptions or operating errors that could negatively impact the fund.
&lt;/p&gt;

&lt;p style="font: 10pt/1.5 Arial, Helvetica, Sans-Serif; margin: 0px 42px 9px; color: #000000; font-weight: 300; text-align: left"&gt;&lt;span style="-sec-ix-redline: true"&gt;The
fund may be an investment option for mutual funds that are managed by Franklin Resources, Inc. (Franklin Templeton) and its affiliates
as &#x201c;funds of funds&#x201d; and other investors with substantial investments in the fund. Such shareholders may at times be considered
to control the fund. Dispositions of a large number of shares by these shareholders may adversely affect the fund&#x2019;s liquidity and
net&#160;assets. These redemptions may also force the fund to sell securities, which may increase the fund&#x2019;s brokerage costs.&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt/1.5 Arial, Helvetica, Sans-Serif; margin: 0px 42px 9px; color: #000000; font-weight: 300; text-align: left"&gt;
The fund may not achieve its goal, and it is not intended to be a complete investment program. &lt;span id="xdx_907_err--RiskTextBlock_dU_c20240430__20240430__dei--LegalEntityAxis__custom--S000003894Member__rr--RiskAxis__rr--RiskNotInsuredDepositoryInstitutionMember_zvS4BgxCqGv7"&gt;An investment in the fund is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency.&lt;/span&gt;
&lt;/p&gt;



&lt;p&gt;
&lt;br/&gt;
&lt;br/&gt;
&lt;/p&gt;

&lt;div style="border-top: Black 1pt solid; margin: 18pt auto; font-size: 1pt"&gt;&#160;&lt;/div&gt;

&lt;p&gt;&lt;br/&gt;
&lt;br/&gt;
&lt;/p&gt;

</rr:RiskTextBlock>
    <rr:RiskTextBlock
      contextRef="From2024-04-302024-04-30_custom_S000003894Member_rr_RiskLoseMoneyMember"
      id="Fact001180">It is important to understand that you can lose money by investing in the fund.</rr:RiskTextBlock>
    <rr:RiskTextBlock
      contextRef="From2024-04-302024-04-30_custom_S000003894Member_rr_RiskNotInsuredDepositoryInstitutionMember"
      id="Fact001181">An investment in the fund is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency.</rr:RiskTextBlock>
    <rr:BarChartAndPerformanceTableHeading
      contextRef="From2024-04-302024-04-30_custom_S000003894Member"
      id="Fact001183">Performance</rr:BarChartAndPerformanceTableHeading>
    <rr:PerformanceNarrativeTextBlock
      contextRef="From2024-04-302024-04-30_custom_S000003894Member"
      id="Fact001184">&lt;p id="xdx_A85_err--PerformanceNarrativeTextBlock_zGG6xZwbvO0j" style="font: 10pt/1.5 Arial, Helvetica, Sans-Serif; margin: 0px 42px 9px; color: #000000; font-weight: 300; text-align: left"&gt;
&lt;span id="xdx_906_err--PerformanceInformationIllustratesVariabilityOfReturns_dU_c20240430__20240430__dei--LegalEntityAxis__custom--S000003894Member_zWJQ4exOa1W1"&gt;The performance information below gives some indication of the risks associated with an investment in the fund by showing the fund&#x2019;s performance year to year and over time.&lt;/span&gt; The performance information does not reflect insurance-related charges or expenses. If it did, performance would be lower. &lt;span id="xdx_905_err--PerformancePastDoesNotIndicateFuture_dU_c20240430__20240430__dei--LegalEntityAxis__custom--S000003894Member_zBqijPbzAsh3"&gt;Please remember that past performance is not necessarily an indication of future results.&lt;/span&gt; 
&lt;/p&gt;

</rr:PerformanceNarrativeTextBlock>
    <rr:PerformanceInformationIllustratesVariabilityOfReturns
      contextRef="From2024-04-302024-04-30_custom_S000003894Member"
      id="Fact001185">The performance information below gives some indication of the risks associated with an investment in the fund by showing the fund&#x2019;s performance year to year and over time.</rr:PerformanceInformationIllustratesVariabilityOfReturns>
    <rr:PerformancePastDoesNotIndicateFuture
      contextRef="From2024-04-302024-04-30_custom_S000003894Member"
      id="Fact001186">Please remember that past performance is not necessarily an indication of future results.</rr:PerformancePastDoesNotIndicateFuture>
    <rr:BarChartHeading
      contextRef="From2024-04-302024-04-30_custom_S000003894Member"
      id="Fact001187">Annual total returns for class IA shares</rr:BarChartHeading>
    <rr:AnnualReturn2014
      contextRef="From2024-04-302024-04-30_custom_S000003894Member_custom_C000010883Member"
      decimals="INF"
      id="Fact001190"
      unitRef="Ratio">0.1297</rr:AnnualReturn2014>
    <rr:AnnualReturn2015
      contextRef="From2024-04-302024-04-30_custom_S000003894Member_custom_C000010883Member"
      decimals="INF"
      id="Fact001192"
      unitRef="Ratio">-0.0279</rr:AnnualReturn2015>
    <rr:AnnualReturn2016
      contextRef="From2024-04-302024-04-30_custom_S000003894Member_custom_C000010883Member"
      decimals="INF"
      id="Fact001194"
      unitRef="Ratio">0.1396</rr:AnnualReturn2016>
    <rr:AnnualReturn2017
      contextRef="From2024-04-302024-04-30_custom_S000003894Member_custom_C000010883Member"
      decimals="INF"
      id="Fact001196"
      unitRef="Ratio">0.1906</rr:AnnualReturn2017>
    <rr:AnnualReturn2018
      contextRef="From2024-04-302024-04-30_custom_S000003894Member_custom_C000010883Member"
      decimals="INF"
      id="Fact001198"
      unitRef="Ratio">-0.0827</rr:AnnualReturn2018>
    <rr:AnnualReturn2019
      contextRef="From2024-04-302024-04-30_custom_S000003894Member_custom_C000010883Member"
      decimals="INF"
      id="Fact001200"
      unitRef="Ratio">0.3073</rr:AnnualReturn2019>
    <rr:AnnualReturn2020
      contextRef="From2024-04-302024-04-30_custom_S000003894Member_custom_C000010883Member"
      decimals="INF"
      id="Fact001202"
      unitRef="Ratio">0.0606</rr:AnnualReturn2020>
    <rr:AnnualReturn2021
      contextRef="From2024-04-302024-04-30_custom_S000003894Member_custom_C000010883Member"
      decimals="INF"
      id="Fact001204"
      unitRef="Ratio">0.2762</rr:AnnualReturn2021>
    <rr:AnnualReturn2022
      contextRef="From2024-04-302024-04-30_custom_S000003894Member_custom_C000010883Member"
      decimals="INF"
      id="Fact001206"
      unitRef="Ratio">-0.0287</rr:AnnualReturn2022>
    <rr:AnnualReturn2023
      contextRef="From2024-04-302024-04-30_custom_S000003894Member_custom_C000010883Member"
      decimals="INF"
      id="Fact001208"
      unitRef="Ratio">0.1592</rr:AnnualReturn2023>
    <rr:YearToDateReturnLabel
      contextRef="From2024-04-302024-04-30_custom_S000003894Member"
      id="Fact001209">Year-to-date performance
through</rr:YearToDateReturnLabel>
    <rr:BarChartYearToDateReturnDate
      contextRef="From2024-04-302024-04-30_custom_S000003894Member"
      id="Fact001210">2024-03-31</rr:BarChartYearToDateReturnDate>
    <rr:BarChartYearToDateReturn
      contextRef="From2024-04-302024-04-30_custom_S000003894Member"
      decimals="INF"
      id="Fact001211"
      unitRef="Ratio">0.1279</rr:BarChartYearToDateReturn>
    <rr:HighestQuarterlyReturnLabel
      contextRef="From2024-04-302024-04-30_custom_S000003894Member"
      id="Fact001212">Best calendar quarte</rr:HighestQuarterlyReturnLabel>
    <rr:BarChartHighestQuarterlyReturnDate
      contextRef="From2024-04-302024-04-30_custom_S000003894Member"
      id="Fact001213">2020-06-30</rr:BarChartHighestQuarterlyReturnDate>
    <rr:BarChartHighestQuarterlyReturn
      contextRef="From2024-04-302024-04-30_custom_S000003894Member"
      decimals="INF"
      id="Fact001214"
      unitRef="Ratio">0.1778</rr:BarChartHighestQuarterlyReturn>
    <rr:LowestQuarterlyReturnLabel
      contextRef="From2024-04-302024-04-30_custom_S000003894Member"
      id="Fact001215">Worst calendar quarter</rr:LowestQuarterlyReturnLabel>
    <rr:BarChartLowestQuarterlyReturnDate
      contextRef="From2024-04-302024-04-30_custom_S000003894Member"
      id="Fact001216">2020-03-31</rr:BarChartLowestQuarterlyReturnDate>
    <rr:BarChartLowestQuarterlyReturn
      contextRef="From2024-04-302024-04-30_custom_S000003894Member"
      decimals="INF"
      id="Fact001217"
      unitRef="Ratio">-0.2553</rr:BarChartLowestQuarterlyReturn>
    <rr:PerformanceTableHeading
      contextRef="From2024-04-302024-04-30_custom_S000003894Member"
      id="Fact001218">Average
annual total returns

(for
periods ended 12/31/23)</rr:PerformanceTableHeading>
    <rr:AverageAnnualReturnYear01
      contextRef="From2024-04-302024-04-30_custom_S000003894Member_custom_C000010883Member"
      decimals="INF"
      id="Fact001220"
      unitRef="Ratio">0.1592</rr:AverageAnnualReturnYear01>
    <rr:AverageAnnualReturnYear05
      contextRef="From2024-04-302024-04-30_custom_S000003894Member_custom_C000010883Member"
      decimals="INF"
      id="Fact001221"
      unitRef="Ratio">0.1478</rr:AverageAnnualReturnYear05>
    <rr:AverageAnnualReturnYear10
      contextRef="From2024-04-302024-04-30_custom_S000003894Member_custom_C000010883Member"
      decimals="INF"
      id="Fact001222"
      unitRef="Ratio">0.1054</rr:AverageAnnualReturnYear10>
    <rr:AverageAnnualReturnYear01
      contextRef="From2024-04-302024-04-30_custom_S000003894Member_custom_C000010884Member"
      decimals="INF"
      id="Fact001223"
      unitRef="Ratio">0.1567</rr:AverageAnnualReturnYear01>
    <rr:AverageAnnualReturnYear05
      contextRef="From2024-04-302024-04-30_custom_S000003894Member_custom_C000010884Member"
      decimals="INF"
      id="Fact001224"
      unitRef="Ratio">0.1450</rr:AverageAnnualReturnYear05>
    <rr:AverageAnnualReturnYear10
      contextRef="From2024-04-302024-04-30_custom_S000003894Member_custom_C000010884Member"
      decimals="INF"
      id="Fact001225"
      unitRef="Ratio">0.1026</rr:AverageAnnualReturnYear10>
    <rr:AverageAnnualReturnYear01
      contextRef="From2024-04-302024-04-30_custom_S000003894Member_custom_Russell1000ValueIndexMember"
      decimals="INF"
      id="Fact001226"
      unitRef="Ratio">0.1146</rr:AverageAnnualReturnYear01>
    <rr:AverageAnnualReturnYear05
      contextRef="From2024-04-302024-04-30_custom_S000003894Member_custom_Russell1000ValueIndexMember"
      decimals="INF"
      id="Fact001227"
      unitRef="Ratio">0.1091</rr:AverageAnnualReturnYear05>
    <rr:AverageAnnualReturnYear10
      contextRef="From2024-04-302024-04-30_custom_S000003894Member_custom_Russell1000ValueIndexMember"
      decimals="INF"
      id="Fact001228"
      unitRef="Ratio">0.0840</rr:AverageAnnualReturnYear10>
    <rr:PerformanceTableClosingTextBlock
      contextRef="From2024-04-302024-04-30_custom_S000003894Member"
      id="Fact001229">&lt;div id="xdx_A8E_err--PerformanceTableClosingTextBlock_zUpmBZkgRfnk"&gt;&lt;/div&gt;
&lt;table style="font: 300 9pt/1.5 Arial, Helvetica, Sans-Serif; margin-left: 10px; width: 90%"&gt;
&lt;tr style="vertical-align: top"&gt;
&lt;td style="width: 25px; text-align: right"&gt;


&lt;/td&gt;
&lt;td&gt;
Frank Russell Company is the source and owner of the trademarks, service marks and copyrights related to the Russell Indexes. Russell&#xae; is a trademark of Frank Russell Company.

&lt;/td&gt;

&lt;/tr&gt;
&lt;/table&gt;

</rr:PerformanceTableClosingTextBlock>
    <rr:RiskReturnHeading
      contextRef="From2024-04-302024-04-30_custom_S000003871Member"
      id="Fact001231">Fund summary</rr:RiskReturnHeading>
    <rr:ObjectiveHeading
      contextRef="From2024-04-302024-04-30_custom_S000003871Member"
      id="Fact001232">Goal</rr:ObjectiveHeading>
    <rr:ObjectivePrimaryTextBlock
      contextRef="From2024-04-302024-04-30_custom_S000003871Member"
      id="Fact001233">&lt;p id="xdx_A8F_err--ObjectivePrimaryTextBlock_zIk2kwhiWCvj" style="font: 10pt/1.5 Arial, Helvetica, Sans-Serif; margin: 0px 42px 9px; color: #000000; font-weight: 300; text-align: left"&gt;
Putnam VT Mortgage Securities Fund seeks as high a level of current income as Putnam Investment Management, LLC believes is consistent with preservation of capital. 
&lt;/p&gt;

</rr:ObjectivePrimaryTextBlock>
    <rr:ExpenseHeading
      contextRef="From2024-04-302024-04-30_custom_S000003871Member"
      id="Fact001234">Fees and expenses</rr:ExpenseHeading>
    <rr:ExpenseNarrativeTextBlock
      contextRef="From2024-04-302024-04-30_custom_S000003871Member"
      id="Fact001235">&lt;p id="xdx_A8F_err--ExpenseNarrativeTextBlock_z1B4tWnOU97f" style="font: 10pt/1.5 Arial, Helvetica, Sans-Serif; margin: 0px 42px 9px; color: #000000; font-weight: 300; text-align: left"&gt;
The following table describes the fees and expenses you may pay if you buy, hold and sell shares of the fund. You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in the tables and examples below. The fees and expenses information does not reflect insurance-related charges or expenses borne by contract holders indirectly investing in the fund. If it did, expenses would be higher.
&lt;/p&gt;

</rr:ExpenseNarrativeTextBlock>
    <rr:OperatingExpensesCaption
      contextRef="From2024-04-302024-04-30_custom_S000003871Member"
      id="Fact001236">
Annual fund operating expenses



(expenses you pay each year as a percentage of the value of your investment)
</rr:OperatingExpensesCaption>
    <rr:ManagementFeesOverAssets
      contextRef="From2024-04-302024-04-30_custom_S000003871Member_custom_C000010837Member"
      decimals="INF"
      id="Fact001238"
      unitRef="Ratio">0.0039</rr:ManagementFeesOverAssets>
    <rr:DistributionAndService12b1FeesOverAssets
      contextRef="From2024-04-302024-04-30_custom_S000003871Member_custom_C000010837Member"
      decimals="INF"
      id="Fact001239"
      unitRef="Ratio">0</rr:DistributionAndService12b1FeesOverAssets>
    <rr:OtherExpensesOverAssets
      contextRef="From2024-04-302024-04-30_custom_S000003871Member_custom_C000010837Member"
      decimals="INF"
      id="Fact001240"
      unitRef="Ratio">0.0064</rr:OtherExpensesOverAssets>
    <rr:ExpensesOverAssets
      contextRef="From2024-04-302024-04-30_custom_S000003871Member_custom_C000010837Member"
      decimals="INF"
      id="Fact001241"
      unitRef="Ratio">0.0103</rr:ExpensesOverAssets>
    <rr:FeeWaiverOrReimbursementOverAssets
      contextRef="From2024-04-302024-04-30_custom_S000003871Member_custom_C000010837Member"
      decimals="INF"
      id="Fact001242"
      unitRef="Ratio">-0.0053</rr:FeeWaiverOrReimbursementOverAssets>
    <rr:NetExpensesOverAssets
      contextRef="From2024-04-302024-04-30_custom_S000003871Member_custom_C000010837Member"
      decimals="INF"
      id="Fact001243"
      unitRef="Ratio">0.0050</rr:NetExpensesOverAssets>
    <rr:ManagementFeesOverAssets
      contextRef="From2024-04-302024-04-30_custom_S000003871Member_custom_C000010838Member"
      decimals="INF"
      id="Fact001244"
      unitRef="Ratio">0.0039</rr:ManagementFeesOverAssets>
    <rr:DistributionAndService12b1FeesOverAssets
      contextRef="From2024-04-302024-04-30_custom_S000003871Member_custom_C000010838Member"
      decimals="INF"
      id="Fact001245"
      unitRef="Ratio">0.0025</rr:DistributionAndService12b1FeesOverAssets>
    <rr:OtherExpensesOverAssets
      contextRef="From2024-04-302024-04-30_custom_S000003871Member_custom_C000010838Member"
      decimals="INF"
      id="Fact001246"
      unitRef="Ratio">0.0064</rr:OtherExpensesOverAssets>
    <rr:ExpensesOverAssets
      contextRef="From2024-04-302024-04-30_custom_S000003871Member_custom_C000010838Member"
      decimals="INF"
      id="Fact001247"
      unitRef="Ratio">0.0128</rr:ExpensesOverAssets>
    <rr:FeeWaiverOrReimbursementOverAssets
      contextRef="From2024-04-302024-04-30_custom_S000003871Member_custom_C000010838Member"
      decimals="INF"
      id="Fact001248"
      unitRef="Ratio">-0.0053</rr:FeeWaiverOrReimbursementOverAssets>
    <rr:NetExpensesOverAssets
      contextRef="From2024-04-302024-04-30_custom_S000003871Member_custom_C000010838Member"
      decimals="INF"
      id="Fact001249"
      unitRef="Ratio">0.0075</rr:NetExpensesOverAssets>
    <rr:FeeWaiverOrReimbursementOverAssetsDateOfTermination
      contextRef="From2024-04-302024-04-30_custom_S000003871Member"
      id="Fact001251">4/30/25</rr:FeeWaiverOrReimbursementOverAssetsDateOfTermination>
    <rr:ExpenseExampleHeading
      contextRef="From2024-04-302024-04-30_custom_S000003871Member"
      id="Fact001252">Example</rr:ExpenseExampleHeading>
    <rr:ExpenseExampleNarrativeTextBlock
      contextRef="From2024-04-302024-04-30_custom_S000003871Member"
      id="Fact001253">&lt;p id="xdx_A84_err--ExpenseExampleNarrativeTextBlock_z08PmsgvI41" style="font: 10pt/1.5 Arial, Helvetica, Sans-Serif; margin: 0px 42px 9px; color: #000000; font-weight: 300; text-align: left"&gt;
The following hypothetical example is intended to help you compare the cost of investing in the fund with the cost of investing in other funds. The example does not reflect insurance-related charges or expenses. If it did, expenses would be higher. It assumes that you invest $10,000 in the fund for the time periods indicated and then redeem or hold all your shares at the end of those periods. It assumes a 5% return on your investment each year and that the fund&#x2019;s operating expenses remain the same. Only the first year of each period in the example takes into account the expense reimbursement described above. Your actual costs may be higher or lower.
&lt;/p&gt;

</rr:ExpenseExampleNarrativeTextBlock>
    <rr:ExpenseExampleYear01
      contextRef="From2024-04-302024-04-30_custom_S000003871Member_custom_C000010837Member"
      decimals="0"
      id="Fact001255"
      unitRef="USD">51</rr:ExpenseExampleYear01>
    <rr:ExpenseExampleYear03
      contextRef="From2024-04-302024-04-30_custom_S000003871Member_custom_C000010837Member"
      decimals="0"
      id="Fact001256"
      unitRef="USD">275</rr:ExpenseExampleYear03>
    <rr:ExpenseExampleYear05
      contextRef="From2024-04-302024-04-30_custom_S000003871Member_custom_C000010837Member"
      decimals="0"
      id="Fact001257"
      unitRef="USD">517</rr:ExpenseExampleYear05>
    <rr:ExpenseExampleYear10
      contextRef="From2024-04-302024-04-30_custom_S000003871Member_custom_C000010837Member"
      decimals="0"
      id="Fact001258"
      unitRef="USD">1211</rr:ExpenseExampleYear10>
    <rr:ExpenseExampleYear01
      contextRef="From2024-04-302024-04-30_custom_S000003871Member_custom_C000010838Member"
      decimals="0"
      id="Fact001259"
      unitRef="USD">77</rr:ExpenseExampleYear01>
    <rr:ExpenseExampleYear03
      contextRef="From2024-04-302024-04-30_custom_S000003871Member_custom_C000010838Member"
      decimals="0"
      id="Fact001260"
      unitRef="USD">353</rr:ExpenseExampleYear03>
    <rr:ExpenseExampleYear05
      contextRef="From2024-04-302024-04-30_custom_S000003871Member_custom_C000010838Member"
      decimals="0"
      id="Fact001261"
      unitRef="USD">651</rr:ExpenseExampleYear05>
    <rr:ExpenseExampleYear10
      contextRef="From2024-04-302024-04-30_custom_S000003871Member_custom_C000010838Member"
      decimals="0"
      id="Fact001262"
      unitRef="USD">1499</rr:ExpenseExampleYear10>
    <rr:PortfolioTurnoverHeading
      contextRef="From2024-04-302024-04-30_custom_S000003871Member"
      id="Fact001263">Portfolio turnover</rr:PortfolioTurnoverHeading>
    <rr:PortfolioTurnoverTextBlock
      contextRef="From2024-04-302024-04-30_custom_S000003871Member"
      id="Fact001264">&lt;p id="xdx_A83_err--PortfolioTurnoverTextBlock_z4cTKhpJp2Gc" style="font: 10pt/1.5 Arial, Helvetica, Sans-Serif; margin: 0px 42px 9px; color: #000000; font-weight: 300; text-align: left"&gt;&lt;span style="-sec-ix-redline: true"&gt;The
fund pays transaction-related costs, such as commissions, when it buys and sells securities (or &#x201c;turns over&#x201d; its portfolio).
A higher turnover rate may indicate higher transaction costs. These costs, which are not reflected in annual fund operating expenses
or the above example, affect fund performance. The fund&#x2019;s turnover rate in the most recent fiscal year was &lt;span id="xdx_900_err--PortfolioTurnoverRate_dpU_c20240430__20240430__dei--LegalEntityAxis__custom--S000003871Member_zc8sUHCELsG6"&gt;1,865&lt;/span&gt;%.&lt;/span&gt;&lt;/p&gt;

</rr:PortfolioTurnoverTextBlock>
    <rr:PortfolioTurnoverRate
      contextRef="From2024-04-302024-04-30_custom_S000003871Member"
      decimals="INF"
      id="Fact001265"
      unitRef="Ratio">18.65</rr:PortfolioTurnoverRate>
    <rr:StrategyHeading
      contextRef="From2024-04-302024-04-30_custom_S000003871Member"
      id="Fact001266">Investments, risks, and performance</rr:StrategyHeading>
    <rr:StrategyNarrativeTextBlock
      contextRef="From2024-04-302024-04-30_custom_S000003871Member"
      id="Fact001267">&lt;p id="xdx_A8A_err--StrategyNarrativeTextBlock_zoqBl1Pl6Dwf" style="font: 600 10pt/1.5 Arial, Helvetica, Sans-Serif; margin: 15px 42px 0px; color: #000000"&gt;
&lt;b&gt;Investments&lt;/b&gt;
&lt;/p&gt;

&lt;p style="font: 10pt/1.5 Arial, Helvetica, Sans-Serif; margin: 0px 42px 9px; color: #000000; font-weight: 300; text-align: left"&gt;
We invest mainly in mortgages, mortgage-related fixed income securities and related derivatives that are either investment-grade or below-investment-grade in quality (sometimes referred to as &#x201c;junk bonds&#x201d;). Under normal circumstances, we invest at least 80% of the fund&#x2019;s net&#160;assets (plus any borrowings for investment purposes) in mortgages, mortgage-related fixed income securities and related derivatives (i.e., derivatives used to acquire exposure to, or whose underlying securities are, mortgages or mortgage-related securities). The fund generally uses the net unrealized gain or loss, or market value, of mortgage-related derivatives for purposes of this policy, but may use the notional value of a derivative if that is determined to be a more appropriate measure of the fund&#x2019;s investment exposure. This policy may be changed only after 60 days&#x2019; notice to shareholders.
&lt;/p&gt;

&lt;p style="font: 10pt/1.5 Arial, Helvetica, Sans-Serif; margin: 0px 42px 9px; color: #000000; font-weight: 300; text-align: left"&gt;
We expect to invest in mortgage-backed investments that are obligations of U.S. government agencies and instrumentalities and accordingly are backed by the full faith and credit of the United States (e.g., Ginnie Mae mortgage-backed bonds) as well as in mortgage-backed investments that are backed by only the credit of a federal agency or government-sponsored entity (e.g., Fannie Mae and Freddie Mac mortgage-backed bonds), and that have short- to long-term maturities.
&lt;/p&gt;

&lt;p style="font: 10pt/1.5 Arial, Helvetica, Sans-Serif; margin: 0px 42px 9px; color: #000000; font-weight: 300; text-align: left"&gt;
We also expect to invest in lower-rated, higher-yielding mortgage-backed securities, including non-agency residential mortgage-backed securities (which may be backed by non-qualified or &#x201c;sub-prime&#x201d; mortgages), commercial mortgage-backed securities, and collateralized mortgage obligations (including interest only, principal only, and other prepayment derivatives). Non-agency (i.e., privately issued) securities typically are lower-rated and higher yielding than securities issued or backed by agencies such as Ginnie Mae, Fannie Mae or Freddie Mac. The fund currently has significant investment exposure to commercial mortgage-backed securities. While our emphasis will be on mortgage-backed securities, we may also invest to a lesser extent in other types of asset-backed securities.
&lt;/p&gt;

&lt;p style="font: 10pt/1.5 Arial, Helvetica, Sans-Serif; margin: 0px 42px 9px; color: #000000; font-weight: 300; text-align: left"&gt;
We may consider, among other factors, credit, interest rate, prepayment and liquidity risks, as well as general market conditions, when deciding whether to buy or sell investments. We typically use to a significant extent derivatives, including credit 
&lt;/p&gt;



&lt;p&gt;
&lt;br/&gt;
&lt;br/&gt;
&lt;/p&gt;

&lt;div style="border-top: Black 1pt solid; margin: 18pt auto; font-size: 1pt"&gt;&#160;&lt;/div&gt;

&lt;p&gt;&lt;br/&gt;
&lt;br/&gt;
&lt;/p&gt;

&lt;p style="font: 10pt/1.5 Arial, Helvetica, Sans-Serif; margin: 0px 42px 9px; color: #000000; font-weight: 300; text-align: left"&gt;
default swaps, interest rate swaps, total return swaps, to-be-announced (TBA) commitments, futures, options and swaptions, including on mortgage-backed securities and indices, for both hedging and non-hedging purposes, including to obtain or adjust exposure to mortgage-backed investments.
&lt;/p&gt;

</rr:StrategyNarrativeTextBlock>
    <rr:RiskHeading
      contextRef="From2024-04-302024-04-30_custom_S000003871Member"
      id="Fact001269">Risks</rr:RiskHeading>
    <rr:RiskTextBlock
      contextRef="From2024-04-302024-04-30_custom_S000003871Member"
      id="Fact001270">&lt;p id="xdx_A8F_err--RiskTextBlock_zBIjbiIbafB2" style="font: 10pt/1.5 Arial, Helvetica, Sans-Serif; margin: 0px 42px 9px; color: #000000; font-weight: 300; text-align: left"&gt;
&lt;span id="xdx_909_err--RiskTextBlock_dpU_c20240430__20240430__dei--LegalEntityAxis__custom--S000003871Member__rr--RiskAxis__rr--RiskLoseMoneyMember_z7QD3NOTboba"&gt;It is important to understand that you can lose money by investing in the fund.&lt;/span&gt;
&lt;/p&gt;

&lt;p style="font: 10pt/1.5 Arial, Helvetica, Sans-Serif; margin: 0px 42px 9px; color: #000000; font-weight: 300; text-align: left"&gt;
The value of investments in the fund&#x2019;s portfolio may fall or fail to rise over extended periods of time for a variety of reasons, including general economic, political or financial market conditions, investor sentiment and market perceptions, government actions, geopolitical events or changes, outbreaks of infectious illnesses or other widespread public health issues, and factors related to a specific issuer, geography, industry or sector, such as the housing or real estate markets. These and other factors may lead to increased volatility and reduced liquidity in the fund&#x2019;s portfolio holdings, may negatively impact the fund&#x2019;s performance, and may exacerbate other risks to which the fund is subject.
&lt;/p&gt;

&lt;p style="font: 10pt/1.5 Arial, Helvetica, Sans-Serif; margin: 0px 42px 9px; color: #000000; font-weight: 300; text-align: left"&gt;
The risks associated with bond investments include interest rate risk, which is the risk that the value of the fund&#x2019;s investments is likely to fall if interest rates rise. Bond investments are also subject to credit risk, which is the risk that issuers of the fund&#x2019;s investments may default on payment of interest or principal. Bond investments may be more susceptible to downgrades or defaults during economic downturns or other periods of economic stress. Default risk is generally higher for non-qualified mortgages. Interest rate risk is generally greater for longer-term bonds, and credit risk is generally greater for below-investment grade bonds, which can be more sensitive to changes in markets, credit conditions, and interest rates, and may be considered speculative. Mortgage- and asset-backed investments, unlike traditional debt investments, are also subject to prepayment risk, which means that they may increase in value less than other bonds when interest rates decline and decline in value more than other bonds when interest rates rise. We may have to invest the proceeds from prepaid investments, including mortgage- and asset-backed investments, in other investments with less attractive terms and yields. The fund&#x2019;s investments in mortgage-backed securities and asset-backed securities, and in certain other securities and derivatives, may be or become illiquid.
&lt;/p&gt;

&lt;p style="font: 10pt/1.5 Arial, Helvetica, Sans-Serif; margin: 0px 42px 9px; color: #000000; font-weight: 300; text-align: left"&gt;
The fund&#x2019;s concentration in an industry group composed of privately issued residential and commercial mortgage-backed securities and mortgage-backed securities issued or guaranteed by the U.S. government or its agencies or instrumentalities may make the fund&#x2019;s net asset value more susceptible to economic, market, political and other developments affecting the residential and commercial real estate markets, and the servicing of mortgage loans secured by real estate properties. During periods of difficult economic conditions, delinquencies and losses on commercial mortgage-backed investments in particular generally increase, including as a result of the effects of those conditions on commercial real estate markets, the ability of commercial tenants to make loan payments, and the ability of a property to attract and retain commercial tenants.
&lt;/p&gt;

&lt;p style="font: 10pt/1.5 Arial, Helvetica, Sans-Serif; margin: 0px 42px 9px; color: #000000; font-weight: 300; text-align: left"&gt;
Our use of derivatives may increase the risks of investing in the fund by increasing investment exposure (which may be considered leverage) or, in the case of many over-the-counter instruments, because of the potential inability to terminate or sell derivative positions and the potential failure of the other party to the instrument to meet its obligations. The risk of a party failing to meet its obligations may increase if the fund has significant exposure to that counterparty. The value of derivatives may move in unexpected ways due to unanticipated market movements, the use of leverage, imperfect correlation between the derivative instrument and the reference asset, or other factors, especially in unusual market conditions, and volatility in the value of derivatives could adversely impact the fund&#x2019;s returns, obligations and exposures. Derivatives are also subject to other risks, including liquidity risk (e.g., liquidity demands arising from the requirement to make payments to a derivative counterparty), operational risk (e.g., settlement issues or system failures) and legal risk (e.g., insufficient legal documentation or contract enforceability&#160;issues).
&lt;/p&gt;

&lt;p style="font: 10pt/1.5 Arial, Helvetica, Sans-Serif; margin: 0px 42px 9px; color: #000000; font-weight: 300; text-align: left"&gt;
There is no guarantee that the investment techniques, analyses, or judgments that we apply in making investment decisions for the fund will produce the intended outcome or that the investments we select for the fund will perform as well as other securities that were not selected for the fund. We, or the fund&#x2019;s other service providers, may experience disruptions or operating errors that could negatively impact the fund. 
&lt;/p&gt;

&lt;p style="font: 10pt/1.5 Arial, Helvetica, Sans-Serif; margin: 0px 42px 9px; color: #000000; font-weight: 300; text-align: left"&gt;&lt;span style="-sec-ix-redline: true"&gt;The
fund may be an investment option for mutual funds that are managed by Franklin Resources, Inc. (Franklin Templeton) and its affiliates
as &#x201c;funds of funds&#x201d; and other investors with substantial investments in the fund. Such shareholders may at times be considered
to control the fund. Dispositions of a large number of shares by these shareholders may adversely affect the fund&#x2019;s liquidity and
net&#160;assets. These redemptions may also force the fund to sell securities, which may increase the fund&#x2019;s brokerage costs.&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt/1.5 Arial, Helvetica, Sans-Serif; margin: 0px 42px 9px; color: #000000; font-weight: 300; text-align: left"&gt;
The fund may not achieve its goal, and it is not intended to be a complete investment program. &lt;span id="xdx_90D_err--RiskTextBlock_dpU_c20240430__20240430__dei--LegalEntityAxis__custom--S000003871Member__rr--RiskAxis__rr--RiskNotInsuredDepositoryInstitutionMember_zD2vtFWjaDS6"&gt;An investment in the fund is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency.&lt;/span&gt;
&lt;/p&gt;

</rr:RiskTextBlock>
    <rr:RiskTextBlock
      contextRef="From2024-04-302024-04-30_custom_S000003871Member_rr_RiskLoseMoneyMember"
      id="Fact001271">It is important to understand that you can lose money by investing in the fund.</rr:RiskTextBlock>
    <rr:RiskTextBlock
      contextRef="From2024-04-302024-04-30_custom_S000003871Member_rr_RiskNotInsuredDepositoryInstitutionMember"
      id="Fact001272">An investment in the fund is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency.</rr:RiskTextBlock>
    <rr:BarChartAndPerformanceTableHeading
      contextRef="From2024-04-302024-04-30_custom_S000003871Member"
      id="Fact001273">Performance</rr:BarChartAndPerformanceTableHeading>
    <rr:PerformanceNarrativeTextBlock
      contextRef="From2024-04-302024-04-30_custom_S000003871Member"
      id="Fact001274">&lt;p id="xdx_A88_err--PerformanceNarrativeTextBlock_zqWnYvqwOmVc" style="font: 10pt/1.5 Arial, Helvetica, Sans-Serif; margin: 0px 42px 9px; color: #000000; font-weight: 300; text-align: left"&gt;
&lt;span id="xdx_90D_err--PerformanceInformationIllustratesVariabilityOfReturns_dpU_c20240430__20240430__dei--LegalEntityAxis__custom--S000003871Member_zU0uQtgTNwMk"&gt;The performance information below gives some indication of the risks associated with an investment in the fund by showing the fund&#x2019;s performance year to year and over time.&lt;/span&gt; Before April&#160;30, 2018, the fund was managed with a materially different investment strategy and may have achieved materially different performance results under its current investment strategy from that shown for periods before this date. The performance information does not 
&lt;/p&gt;



&lt;p&gt;
&lt;br/&gt;
&lt;br/&gt;
&lt;/p&gt;

&lt;div style="border-top: Black 1pt solid; margin: 18pt auto; font-size: 1pt"&gt;&#160;&lt;/div&gt;

&lt;p&gt;&lt;br/&gt;
&lt;br/&gt;
&lt;/p&gt;

&lt;p style="font: 10pt/1.5 Arial, Helvetica, Sans-Serif; margin: 0px 42px 9px; color: #000000; font-weight: 300; text-align: left"&gt;
reflect insurance-related charges or expenses. If it did, performance would be lower. &lt;span id="xdx_900_err--BarChartDoesNotReflectSalesLoads_dpU_c20240430__20240430__dei--LegalEntityAxis__custom--S000003871Member_ztP5BDUbo5V4"&gt;Please remember that past performance is not necessarily an indication of future results.&lt;/span&gt;
&lt;/p&gt;

</rr:PerformanceNarrativeTextBlock>
    <rr:PerformanceInformationIllustratesVariabilityOfReturns
      contextRef="From2024-04-302024-04-30_custom_S000003871Member"
      id="Fact001275">The performance information below gives some indication of the risks associated with an investment in the fund by showing the fund&#x2019;s performance year to year and over time.</rr:PerformanceInformationIllustratesVariabilityOfReturns>
    <rr:BarChartDoesNotReflectSalesLoads
      contextRef="From2024-04-302024-04-30_custom_S000003871Member"
      id="Fact001277">Please remember that past performance is not necessarily an indication of future results.</rr:BarChartDoesNotReflectSalesLoads>
    <rr:BarChartHeading
      contextRef="From2024-04-302024-04-30_custom_S000003871Member"
      id="Fact001278">Annual total returns for class IA shares</rr:BarChartHeading>
    <rr:AnnualReturn2014
      contextRef="From2024-04-302024-04-30_custom_S000003871Member_custom_C000010837Member"
      decimals="INF"
      id="Fact001281"
      unitRef="Ratio">0.0449</rr:AnnualReturn2014>
    <rr:AnnualReturn2015
      contextRef="From2024-04-302024-04-30_custom_S000003871Member_custom_C000010837Member"
      decimals="INF"
      id="Fact001283"
      unitRef="Ratio">-0.0033</rr:AnnualReturn2015>
    <rr:AnnualReturn2016
      contextRef="From2024-04-302024-04-30_custom_S000003871Member_custom_C000010837Member"
      decimals="INF"
      id="Fact001285"
      unitRef="Ratio">0.0036</rr:AnnualReturn2016>
    <rr:AnnualReturn2017
      contextRef="From2024-04-302024-04-30_custom_S000003871Member_custom_C000010837Member"
      decimals="INF"
      id="Fact001287"
      unitRef="Ratio">0.0227</rr:AnnualReturn2017>
    <rr:AnnualReturn2018
      contextRef="From2024-04-302024-04-30_custom_S000003871Member_custom_C000010837Member"
      decimals="INF"
      id="Fact001289"
      unitRef="Ratio">-0.0062</rr:AnnualReturn2018>
    <rr:AnnualReturn2019
      contextRef="From2024-04-302024-04-30_custom_S000003871Member_custom_C000010837Member"
      decimals="INF"
      id="Fact001291"
      unitRef="Ratio">0.1336</rr:AnnualReturn2019>
    <rr:AnnualReturn2020
      contextRef="From2024-04-302024-04-30_custom_S000003871Member_custom_C000010837Member"
      decimals="INF"
      id="Fact001293"
      unitRef="Ratio">-0.0129</rr:AnnualReturn2020>
    <rr:AnnualReturn2021
      contextRef="From2024-04-302024-04-30_custom_S000003871Member_custom_C000010837Member"
      decimals="INF"
      id="Fact001295"
      unitRef="Ratio">-0.0343</rr:AnnualReturn2021>
    <rr:AnnualReturn2022
      contextRef="From2024-04-302024-04-30_custom_S000003871Member_custom_C000010837Member"
      decimals="INF"
      id="Fact001297"
      unitRef="Ratio">-0.0995</rr:AnnualReturn2022>
    <rr:AnnualReturn2023
      contextRef="From2024-04-302024-04-30_custom_S000003871Member_custom_C000010837Member"
      decimals="INF"
      id="Fact001299"
      unitRef="Ratio">0.0558</rr:AnnualReturn2023>
    <rr:YearToDateReturnLabel
      contextRef="From2024-04-302024-04-30_custom_S000003871Member"
      id="Fact001300">Year-to-date performance
through</rr:YearToDateReturnLabel>
    <rr:BarChartYearToDateReturnDate
      contextRef="From2024-04-302024-04-30_custom_S000003871Member"
      id="Fact001301">2024-03-31</rr:BarChartYearToDateReturnDate>
    <rr:BarChartYearToDateReturn
      contextRef="From2024-04-302024-04-30_custom_S000003871Member"
      decimals="INF"
      id="Fact001302"
      unitRef="Ratio">0.0093</rr:BarChartYearToDateReturn>
    <rr:HighestQuarterlyReturnLabel
      contextRef="From2024-04-302024-04-30_custom_S000003871Member"
      id="Fact001303">Best calendar quarter</rr:HighestQuarterlyReturnLabel>
    <rr:BarChartHighestQuarterlyReturnDate
      contextRef="From2024-04-302024-04-30_custom_S000003871Member"
      id="Fact001304">2023-12-31</rr:BarChartHighestQuarterlyReturnDate>
    <rr:BarChartHighestQuarterlyReturn
      contextRef="From2024-04-302024-04-30_custom_S000003871Member"
      decimals="INF"
      id="Fact001305"
      unitRef="Ratio">0.0797</rr:BarChartHighestQuarterlyReturn>
    <rr:LowestQuarterlyReturnLabel
      contextRef="From2024-04-302024-04-30_custom_S000003871Member"
      id="Fact001306">Worst calendar quarter</rr:LowestQuarterlyReturnLabel>
    <rr:BarChartLowestQuarterlyReturnDate
      contextRef="From2024-04-302024-04-30_custom_S000003871Member"
      id="Fact001307">2020-03-31</rr:BarChartLowestQuarterlyReturnDate>
    <rr:BarChartLowestQuarterlyReturn
      contextRef="From2024-04-302024-04-30_custom_S000003871Member"
      decimals="INF"
      id="Fact001308"
      unitRef="Ratio">-0.0991</rr:BarChartLowestQuarterlyReturn>
    <rr:PerformanceTableHeading
      contextRef="From2024-04-302024-04-30_custom_S000003871Member"
      id="Fact001309">Average
annual total returns

(for
periods ended 12/31/23)</rr:PerformanceTableHeading>
    <rr:AverageAnnualReturnYear01
      contextRef="From2024-04-302024-04-30_custom_S000003871Member_custom_C000010837Member"
      decimals="INF"
      id="Fact001311"
      unitRef="Ratio">0.0558</rr:AverageAnnualReturnYear01>
    <rr:AverageAnnualReturnYear05
      contextRef="From2024-04-302024-04-30_custom_S000003871Member_custom_C000010837Member"
      decimals="INF"
      id="Fact001312"
      unitRef="Ratio">0.0054</rr:AverageAnnualReturnYear05>
    <rr:AverageAnnualReturnYear10
      contextRef="From2024-04-302024-04-30_custom_S000003871Member_custom_C000010837Member"
      decimals="INF"
      id="Fact001313"
      unitRef="Ratio">0.0088</rr:AverageAnnualReturnYear10>
    <rr:AverageAnnualReturnYear01
      contextRef="From2024-04-302024-04-30_custom_S000003871Member_custom_C000010838Member"
      decimals="INF"
      id="Fact001314"
      unitRef="Ratio">0.0527</rr:AverageAnnualReturnYear01>
    <rr:AverageAnnualReturnYear05
      contextRef="From2024-04-302024-04-30_custom_S000003871Member_custom_C000010838Member"
      decimals="INF"
      id="Fact001315"
      unitRef="Ratio">0.0030</rr:AverageAnnualReturnYear05>
    <rr:AverageAnnualReturnYear10
      contextRef="From2024-04-302024-04-30_custom_S000003871Member_custom_C000010838Member"
      decimals="INF"
      id="Fact001316"
      unitRef="Ratio">0.0063</rr:AverageAnnualReturnYear10>
    <rr:AverageAnnualReturnYear01
      contextRef="From2024-04-302024-04-30_custom_S000003871Member_custom_BUSMBSIndexMember"
      decimals="INF"
      id="Fact001317"
      unitRef="Ratio">0.0505</rr:AverageAnnualReturnYear01>
    <rr:AverageAnnualReturnYear05
      contextRef="From2024-04-302024-04-30_custom_S000003871Member_custom_BUSMBSIndexMember"
      decimals="INF"
      id="Fact001318"
      unitRef="Ratio">0.0025</rr:AverageAnnualReturnYear05>
    <rr:AverageAnnualReturnYear10
      contextRef="From2024-04-302024-04-30_custom_S000003871Member_custom_BUSMBSIndexMember"
      decimals="INF"
      id="Fact001319"
      unitRef="Ratio">0.0138</rr:AverageAnnualReturnYear10>
    <rr:AverageAnnualReturnYear01
      contextRef="From2024-04-302024-04-30_custom_S000003871Member_custom_PVTMortgageSecuritiesLBMember"
      decimals="INF"
      id="Fact001320"
      unitRef="Ratio">0.0505</rr:AverageAnnualReturnYear01>
    <rr:AverageAnnualReturnYear05
      contextRef="From2024-04-302024-04-30_custom_S000003871Member_custom_PVTMortgageSecuritiesLBMember"
      decimals="INF"
      id="Fact001321"
      unitRef="Ratio">0.0025</rr:AverageAnnualReturnYear05>
    <rr:AverageAnnualReturnYear10
      contextRef="From2024-04-302024-04-30_custom_S000003871Member_custom_PVTMortgageSecuritiesLBMember"
      decimals="INF"
      id="Fact001322"
      unitRef="Ratio">0.0110</rr:AverageAnnualReturnYear10>
    <rr:PerformanceTableClosingTextBlock
      contextRef="From2024-04-302024-04-30_custom_S000003871Member"
      id="Fact001323">&lt;div id="xdx_A84_err--PerformanceTableClosingTextBlock_zuBknoF0aL5j"&gt;&lt;/div&gt;
&lt;table style="font: 300 9pt/1.5 Arial, Helvetica, Sans-Serif; margin-left: 10px; width: 90%"&gt;
&lt;tr style="vertical-align: top"&gt;
&lt;td style="width: 25px; text-align: right"&gt;


&lt;/td&gt;
&lt;td&gt;
The Putnam VT Mortgage Securities Linked Benchmark represents the performance of the Bloomberg Government Bond Index through April 29, 2018, and the performance of the Bloomberg U.S. MBS Index thereafter.

&lt;/td&gt;

&lt;/tr&gt;
&lt;/table&gt;

&lt;table style="font: 300 9pt/1.5 Arial, Helvetica, Sans-Serif; margin-left: 10px; width: 90%"&gt;
&lt;tr style="vertical-align: top"&gt;
&lt;td style="width: 25px; text-align: right"&gt;


&lt;/td&gt;
&lt;td&gt;
All Bloomberg indices are provided by Bloomberg Index Services Limited.

&lt;/td&gt;

&lt;/tr&gt;
&lt;/table&gt;

&lt;table style="font: 300 9pt/1.5 Arial, Helvetica, Sans-Serif; margin-left: 10px; width: 90%"&gt;
&lt;tr style="vertical-align: top"&gt;
&lt;td style="width: 25px; text-align: right"&gt;


&lt;/td&gt;
&lt;td&gt;
BLOOMBERG&#xae; is a trademark and service mark of Bloomberg Finance L.P. and its affiliates (collectively &#x201c;Bloomberg&#x201d;). Bloomberg or Bloomberg&#x2019;s licensors, own all proprietary rights in the Bloomberg Indices. Neither Bloomberg nor Bloomberg&#x2019;s licensors approve or endorse this material, or guarantee the accuracy or completeness of any information herein, or make any warranty, express or implied, as to the results to be obtained therefrom, and to the maximum extent allowed by law, neither shall have any liability or responsibility for injury or damages arising in connection therewith.

&lt;/td&gt;

&lt;/tr&gt;
&lt;/table&gt;

</rr:PerformanceTableClosingTextBlock>
    <rr:RiskReturnHeading
      contextRef="From2024-04-302024-04-30_custom_S000003887Member"
      id="Fact001325">Fund summary</rr:RiskReturnHeading>
    <rr:ObjectiveHeading
      contextRef="From2024-04-302024-04-30_custom_S000003887Member"
      id="Fact001326">Goal</rr:ObjectiveHeading>
    <rr:ObjectivePrimaryTextBlock
      contextRef="From2024-04-302024-04-30_custom_S000003887Member"
      id="Fact001327">&lt;p id="xdx_A84_err--ObjectivePrimaryTextBlock_znfXtdDw72O7" style="font: 10pt/1.5 Arial, Helvetica, Sans-Serif; margin: 0px 42px 9px; color: #000000; font-weight: 300; text-align: left"&gt;
Putnam VT Research Fund seeks capital appreciation.
&lt;/p&gt;

</rr:ObjectivePrimaryTextBlock>
    <rr:ExpenseHeading
      contextRef="From2024-04-302024-04-30_custom_S000003887Member"
      id="Fact001328">Fees and expenses</rr:ExpenseHeading>
    <rr:ExpenseNarrativeTextBlock
      contextRef="From2024-04-302024-04-30_custom_S000003887Member"
      id="Fact001329">&lt;p id="xdx_A8F_err--ExpenseNarrativeTextBlock_zYTlombxzk0f" style="font: 10pt/1.5 Arial, Helvetica, Sans-Serif; margin: 0px 42px 9px; color: #000000; font-weight: 300; text-align: left"&gt;
The following table describes the fees and expenses you may pay if you buy, hold and sell shares of the fund. You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in the tables and examples below. The fees and expenses information does not reflect insurance-related charges or expenses borne by contract holders indirectly investing in the fund. If it did, expenses would be higher.
&lt;/p&gt;

</rr:ExpenseNarrativeTextBlock>
    <rr:OperatingExpensesCaption
      contextRef="From2024-04-302024-04-30_custom_S000003887Member"
      id="Fact001330">
Annual fund operating expenses 



(expenses you pay each year as a percentage of the value of your investment)
</rr:OperatingExpensesCaption>
    <rr:ManagementFeesOverAssets
      contextRef="From2024-04-302024-04-30_custom_S000003887Member_custom_C000010869Member"
      decimals="INF"
      id="Fact001332"
      unitRef="Ratio">0.0055</rr:ManagementFeesOverAssets>
    <rr:DistributionAndService12b1FeesOverAssets
      contextRef="From2024-04-302024-04-30_custom_S000003887Member_custom_C000010869Member"
      decimals="INF"
      id="Fact001333"
      unitRef="Ratio">0</rr:DistributionAndService12b1FeesOverAssets>
    <rr:OtherExpensesOverAssets
      contextRef="From2024-04-302024-04-30_custom_S000003887Member_custom_C000010869Member"
      decimals="INF"
      id="Fact001334"
      unitRef="Ratio">0.0019</rr:OtherExpensesOverAssets>
    <rr:ExpensesOverAssets
      contextRef="From2024-04-302024-04-30_custom_S000003887Member_custom_C000010869Member"
      decimals="INF"
      id="Fact001335"
      unitRef="Ratio">0.0074</rr:ExpensesOverAssets>
    <rr:ManagementFeesOverAssets
      contextRef="From2024-04-302024-04-30_custom_S000003887Member_custom_C000010870Member"
      decimals="INF"
      id="Fact001336"
      unitRef="Ratio">0.0055</rr:ManagementFeesOverAssets>
    <rr:DistributionAndService12b1FeesOverAssets
      contextRef="From2024-04-302024-04-30_custom_S000003887Member_custom_C000010870Member"
      decimals="INF"
      id="Fact001337"
      unitRef="Ratio">0.0025</rr:DistributionAndService12b1FeesOverAssets>
    <rr:OtherExpensesOverAssets
      contextRef="From2024-04-302024-04-30_custom_S000003887Member_custom_C000010870Member"
      decimals="INF"
      id="Fact001338"
      unitRef="Ratio">0.0019</rr:OtherExpensesOverAssets>
    <rr:ExpensesOverAssets
      contextRef="From2024-04-302024-04-30_custom_S000003887Member_custom_C000010870Member"
      decimals="INF"
      id="Fact001339"
      unitRef="Ratio">0.0099</rr:ExpensesOverAssets>
    <rr:ExpenseExampleHeading
      contextRef="From2024-04-302024-04-30_custom_S000003887Member"
      id="Fact001340">Example</rr:ExpenseExampleHeading>
    <rr:ExpenseExampleNarrativeTextBlock
      contextRef="From2024-04-302024-04-30_custom_S000003887Member"
      id="Fact001341">&lt;p id="xdx_A8E_err--ExpenseExampleNarrativeTextBlock_z4p0aqq3Yd83" style="font: 10pt/1.5 Arial, Helvetica, Sans-Serif; margin: 0px 42px 9px; color: #000000; font-weight: 300; text-align: left"&gt;
The following hypothetical example is intended to help you compare the cost of investing in the fund with the cost of investing in other funds. The example does not reflect insurance-related charges or expenses. If it did, expenses would be higher. It assumes that you invest $10,000 in the fund for the time periods indicated and then redeem or hold all your shares at the end of those periods. It assumes a 5% return on your investment each year and that the fund&#x2019;s operating expenses remain the same. Your actual costs may be higher or lower.
&lt;/p&gt;

</rr:ExpenseExampleNarrativeTextBlock>
    <rr:ExpenseExampleYear01
      contextRef="From2024-04-302024-04-30_custom_S000003887Member_custom_C000010869Member"
      decimals="0"
      id="Fact001343"
      unitRef="USD">76</rr:ExpenseExampleYear01>
    <rr:ExpenseExampleYear03
      contextRef="From2024-04-302024-04-30_custom_S000003887Member_custom_C000010869Member"
      decimals="0"
      id="Fact001344"
      unitRef="USD">237</rr:ExpenseExampleYear03>
    <rr:ExpenseExampleYear05
      contextRef="From2024-04-302024-04-30_custom_S000003887Member_custom_C000010869Member"
      decimals="0"
      id="Fact001345"
      unitRef="USD">411</rr:ExpenseExampleYear05>
    <rr:ExpenseExampleYear10
      contextRef="From2024-04-302024-04-30_custom_S000003887Member_custom_C000010869Member"
      decimals="0"
      id="Fact001346"
      unitRef="USD">918</rr:ExpenseExampleYear10>
    <rr:ExpenseExampleYear01
      contextRef="From2024-04-302024-04-30_custom_S000003887Member_custom_C000010870Member"
      decimals="0"
      id="Fact001347"
      unitRef="USD">101</rr:ExpenseExampleYear01>
    <rr:ExpenseExampleYear03
      contextRef="From2024-04-302024-04-30_custom_S000003887Member_custom_C000010870Member"
      decimals="0"
      id="Fact001348"
      unitRef="USD">315</rr:ExpenseExampleYear03>
    <rr:ExpenseExampleYear05
      contextRef="From2024-04-302024-04-30_custom_S000003887Member_custom_C000010870Member"
      decimals="0"
      id="Fact001349"
      unitRef="USD">547</rr:ExpenseExampleYear05>
    <rr:ExpenseExampleYear10
      contextRef="From2024-04-302024-04-30_custom_S000003887Member_custom_C000010870Member"
      decimals="0"
      id="Fact001350"
      unitRef="USD">1213</rr:ExpenseExampleYear10>
    <rr:PortfolioTurnoverHeading
      contextRef="From2024-04-302024-04-30_custom_S000003887Member"
      id="Fact001351">Portfolio turnover</rr:PortfolioTurnoverHeading>
    <rr:PortfolioTurnoverTextBlock
      contextRef="From2024-04-302024-04-30_custom_S000003887Member"
      id="Fact001352">&lt;p id="xdx_A80_err--PortfolioTurnoverTextBlock_zpCAJvJS38u2" style="font: 10pt/1.5 Arial, Helvetica, Sans-Serif; margin: 0px 42px 9px; color: #000000; font-weight: 300; text-align: left"&gt;&lt;span style="-sec-ix-redline: true"&gt;The
fund pays transaction-related costs, such as commissions, when it buys and sells securities (or &#x201c;turns over&#x201d; its portfolio).
A higher turnover rate may indicate higher transaction costs. These costs, which are not reflected in annual fund operating expenses
or the above example, affect fund performance. The fund&#x2019;s turnover rate in the most recent fiscal year was &lt;span id="xdx_90E_err--PortfolioTurnoverRate_dU_c20240430__20240430__dei--LegalEntityAxis__custom--S000003887Member_zX0dpKj0D3tg"&gt;34%&lt;/span&gt;.&lt;/span&gt;&lt;/p&gt;

</rr:PortfolioTurnoverTextBlock>
    <rr:PortfolioTurnoverRate
      contextRef="From2024-04-302024-04-30_custom_S000003887Member"
      decimals="INF"
      id="Fact001353"
      unitRef="Ratio">0.34</rr:PortfolioTurnoverRate>
    <rr:StrategyHeading
      contextRef="From2024-04-302024-04-30_custom_S000003887Member"
      id="Fact001354">Investments, risks, and performance</rr:StrategyHeading>
    <rr:StrategyNarrativeTextBlock
      contextRef="From2024-04-302024-04-30_custom_S000003887Member"
      id="Fact001355">&lt;p id="xdx_A89_err--StrategyNarrativeTextBlock_zf5zIGapUKUf" style="font: 600 10pt/1.5 Arial, Helvetica, Sans-Serif; margin: 15px 42px 0px; color: #000000"&gt;
&lt;b&gt;Investments&lt;/b&gt;
&lt;/p&gt;

&lt;p style="font: 10pt/1.5 Arial, Helvetica, Sans-Serif; margin: 0px 42px 9px; color: #000000; font-weight: 300; text-align: left"&gt;
We invest mainly in common stocks (growth or value stocks or both) of large U.S. companies that we believe have favorable investment potential. For example, we may purchase stocks of companies with stock prices that reflect a value lower than that which we place on the company. We may also consider other factors we believe will cause the stock price to rise. We may consider, among other factors, a company&#x2019;s valuation, financial strength, growth potential, competitive position in its industry, projected future earnings, cash flows and dividends when deciding whether to buy or sell investments. 
&lt;/p&gt;

</rr:StrategyNarrativeTextBlock>
    <rr:RiskHeading
      contextRef="From2024-04-302024-04-30_custom_S000003887Member"
      id="Fact001356">Risks</rr:RiskHeading>
    <rr:RiskTextBlock
      contextRef="From2024-04-302024-04-30_custom_S000003887Member"
      id="Fact001357">&lt;p id="xdx_A8D_err--RiskTextBlock_zEmSQGBcReE5" style="font: 10pt/1.5 Arial, Helvetica, Sans-Serif; margin: 0px 42px 9px; color: #000000; font-weight: 300; text-align: left"&gt;
&lt;span id="xdx_90E_err--RiskTextBlock_dU_c20240430__20240430__dei--LegalEntityAxis__custom--S000003887Member__rr--RiskAxis__rr--RiskLoseMoneyMember_zMonMPsTXkGa"&gt;It is important to understand that you can lose money by investing in the fund.&lt;/span&gt;
&lt;/p&gt;

&lt;p style="font: 10pt/1.5 Arial, Helvetica, Sans-Serif; margin: 0px 42px 9px; color: #000000; font-weight: 300; text-align: left"&gt;
The value of investments in the fund&#x2019;s portfolio may fall or fail to rise over extended periods of time for a variety of reasons, including general economic, political or financial market conditions, investor sentiment and market perceptions, government actions, geopolitical events or changes, outbreaks of infectious illnesses or other widespread public health issues, and factors related to a specific issuer, geography, industry or sector. These and other factors may lead to increased volatility and reduced liquidity in the fund&#x2019;s portfolio holdings, may negatively impact the fund&#x2019;s performance, and may exacerbate other risks to which the fund is subject. Companies whose stocks we believe are undervalued by the market may have experienced adverse business developments or may be subject to special risks that have caused their stocks to be out of favor. Growth stocks may be more susceptible to earnings disappointments, and value stocks may fail to rebound. From time to time, the fund may invest a significant portion of its assets in companies in one or more related industries or sectors, which would make the fund more vulnerable to adverse developments affecting those companies, industries or sectors.
&lt;/p&gt;

&lt;p style="font: 10pt/1.5 Arial, Helvetica, Sans-Serif; margin: 0px 42px 9px; color: #000000; font-weight: 300; text-align: left"&gt;
There is no guarantee that the investment techniques, analyses, or judgments that we apply in making investment decisions for the fund will produce the intended outcome or that the investments we select for the fund will perform as well as other securities that were not selected for the fund. We, or the fund&#x2019;s other service providers, may experience disruptions or operating errors that could negatively impact the fund.
&lt;/p&gt;

&lt;p style="font: 10pt/1.5 Arial, Helvetica, Sans-Serif; margin: 0px 42px 9px; color: #000000; font-weight: 300; text-align: left"&gt;&lt;span style="-sec-ix-redline: true"&gt;The
fund may be an investment option for mutual funds that are managed by Franklin Resources, Inc. (Franklin Templeton) and its affiliates
as &#x201c;funds of funds&#x201d; and other investors with substantial investments in the fund. Such shareholders may at times be considered
to control the fund. Dispositions of a large number of shares by these shareholders may adversely affect the fund&#x2019;s liquidity and
net&#160;assets. These redemptions may also force the fund to sell securities, which may increase the fund&#x2019;s brokerage costs.&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt/1.5 Arial, Helvetica, Sans-Serif; margin: 0px 42px 9px; color: #000000; font-weight: 300; text-align: left"&gt;
The fund may not achieve its goal, and it is not intended to be a complete investment program. &lt;span id="xdx_90F_err--RiskTextBlock_dU_c20240430__20240430__dei--LegalEntityAxis__custom--S000003887Member__rr--RiskAxis__rr--RiskNotInsuredDepositoryInstitutionMember_zJ0R7xlBlmO8"&gt;An investment in the fund is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency.&lt;/span&gt;
&lt;/p&gt;



&lt;p&gt;
&lt;br/&gt;
&lt;br/&gt;
&lt;/p&gt;

&lt;div style="border-top: Black 1pt solid; margin: 18pt auto; font-size: 1pt"&gt;&#160;&lt;/div&gt;

&lt;p&gt;&lt;br/&gt;
&lt;br/&gt;
&lt;/p&gt;

</rr:RiskTextBlock>
    <rr:RiskTextBlock
      contextRef="From2024-04-302024-04-30_custom_S000003887Member_rr_RiskLoseMoneyMember"
      id="Fact001358">It is important to understand that you can lose money by investing in the fund.</rr:RiskTextBlock>
    <rr:RiskTextBlock
      contextRef="From2024-04-302024-04-30_custom_S000003887Member_rr_RiskNotInsuredDepositoryInstitutionMember"
      id="Fact001359">An investment in the fund is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency.</rr:RiskTextBlock>
    <rr:BarChartAndPerformanceTableHeading
      contextRef="From2024-04-302024-04-30_custom_S000003887Member"
      id="Fact001361">Performance</rr:BarChartAndPerformanceTableHeading>
    <rr:PerformanceNarrativeTextBlock
      contextRef="From2024-04-302024-04-30_custom_S000003887Member"
      id="Fact001362">&lt;p id="xdx_A83_err--PerformanceNarrativeTextBlock_zBJCqacUJYse" style="font: 10pt/1.5 Arial, Helvetica, Sans-Serif; margin: 0px 42px 9px; color: #000000; font-weight: 300; text-align: left"&gt;
&lt;span id="xdx_908_err--PerformanceInformationIllustratesVariabilityOfReturns_dU_c20240430__20240430__dei--LegalEntityAxis__custom--S000003887Member_zsnQxpeaqBq2"&gt;The performance information below gives some indication of the risks associated with an investment in the fund by showing the fund&#x2019;s performance year to year and over time.&lt;/span&gt; The performance information does not reflect insurance-related charges or expenses. If it did, performance would be lower. &lt;span id="xdx_90E_err--PerformancePastDoesNotIndicateFuture_dU_c20240430__20240430__dei--LegalEntityAxis__custom--S000003887Member_zbwiREWoKQyi"&gt;Please remember that past performance is not necessarily an indication of future results.&lt;/span&gt; 
&lt;/p&gt;

</rr:PerformanceNarrativeTextBlock>
    <rr:PerformanceInformationIllustratesVariabilityOfReturns
      contextRef="From2024-04-302024-04-30_custom_S000003887Member"
      id="Fact001363">The performance information below gives some indication of the risks associated with an investment in the fund by showing the fund&#x2019;s performance year to year and over time.</rr:PerformanceInformationIllustratesVariabilityOfReturns>
    <rr:PerformancePastDoesNotIndicateFuture
      contextRef="From2024-04-302024-04-30_custom_S000003887Member"
      id="Fact001364">Please remember that past performance is not necessarily an indication of future results.</rr:PerformancePastDoesNotIndicateFuture>
    <rr:BarChartHeading
      contextRef="From2024-04-302024-04-30_custom_S000003887Member"
      id="Fact001365">Annual total returns for class IA shares</rr:BarChartHeading>
    <rr:AnnualReturn2014
      contextRef="From2024-04-302024-04-30_custom_S000003887Member_custom_C000010869Member"
      decimals="INF"
      id="Fact001368"
      unitRef="Ratio">0.1517</rr:AnnualReturn2014>
    <rr:AnnualReturn2015
      contextRef="From2024-04-302024-04-30_custom_S000003887Member_custom_C000010869Member"
      decimals="INF"
      id="Fact001370"
      unitRef="Ratio">-0.0129</rr:AnnualReturn2015>
    <rr:AnnualReturn2016
      contextRef="From2024-04-302024-04-30_custom_S000003887Member_custom_C000010869Member"
      decimals="INF"
      id="Fact001372"
      unitRef="Ratio">0.1032</rr:AnnualReturn2016>
    <rr:AnnualReturn2017
      contextRef="From2024-04-302024-04-30_custom_S000003887Member_custom_C000010869Member"
      decimals="INF"
      id="Fact001374"
      unitRef="Ratio">0.2370</rr:AnnualReturn2017>
    <rr:AnnualReturn2018
      contextRef="From2024-04-302024-04-30_custom_S000003887Member_custom_C000010869Member"
      decimals="INF"
      id="Fact001376"
      unitRef="Ratio">-0.0451</rr:AnnualReturn2018>
    <rr:AnnualReturn2019
      contextRef="From2024-04-302024-04-30_custom_S000003887Member_custom_C000010869Member"
      decimals="INF"
      id="Fact001378"
      unitRef="Ratio">0.3359</rr:AnnualReturn2019>
    <rr:AnnualReturn2020
      contextRef="From2024-04-302024-04-30_custom_S000003887Member_custom_C000010869Member"
      decimals="INF"
      id="Fact001380"
      unitRef="Ratio">0.2023</rr:AnnualReturn2020>
    <rr:AnnualReturn2021
      contextRef="From2024-04-302024-04-30_custom_S000003887Member_custom_C000010869Member"
      decimals="INF"
      id="Fact001382"
      unitRef="Ratio">0.2444</rr:AnnualReturn2021>
    <rr:AnnualReturn2022
      contextRef="From2024-04-302024-04-30_custom_S000003887Member_custom_C000010869Member"
      decimals="INF"
      id="Fact001384"
      unitRef="Ratio">-0.1707</rr:AnnualReturn2022>
    <rr:AnnualReturn2023
      contextRef="From2024-04-302024-04-30_custom_S000003887Member_custom_C000010869Member"
      decimals="INF"
      id="Fact001386"
      unitRef="Ratio">0.2916</rr:AnnualReturn2023>
    <rr:YearToDateReturnLabel
      contextRef="From2024-04-302024-04-30_custom_S000003887Member"
      id="Fact001387">Year-to-date performance
through</rr:YearToDateReturnLabel>
    <rr:BarChartYearToDateReturnDate
      contextRef="From2024-04-302024-04-30_custom_S000003887Member"
      id="Fact001388">2024-03-31</rr:BarChartYearToDateReturnDate>
    <rr:BarChartYearToDateReturn
      contextRef="From2024-04-302024-04-30_custom_S000003887Member"
      decimals="INF"
      id="Fact001389"
      unitRef="Ratio">0.1234</rr:BarChartYearToDateReturn>
    <rr:HighestQuarterlyReturnLabel
      contextRef="From2024-04-302024-04-30_custom_S000003887Member"
      id="Fact001390">Best calendar quarter</rr:HighestQuarterlyReturnLabel>
    <rr:BarChartHighestQuarterlyReturnDate
      contextRef="From2024-04-302024-04-30_custom_S000003887Member"
      id="Fact001391">2020-06-30</rr:BarChartHighestQuarterlyReturnDate>
    <rr:BarChartHighestQuarterlyReturn
      contextRef="From2024-04-302024-04-30_custom_S000003887Member"
      decimals="INF"
      id="Fact001392"
      unitRef="Ratio">0.2149</rr:BarChartHighestQuarterlyReturn>
    <rr:LowestQuarterlyReturnLabel
      contextRef="From2024-04-302024-04-30_custom_S000003887Member"
      id="Fact001393">Worst calendar quarter</rr:LowestQuarterlyReturnLabel>
    <rr:BarChartLowestQuarterlyReturnDate
      contextRef="From2024-04-302024-04-30_custom_S000003887Member"
      id="Fact001394">2020-03-31</rr:BarChartLowestQuarterlyReturnDate>
    <rr:BarChartLowestQuarterlyReturn
      contextRef="From2024-04-302024-04-30_custom_S000003887Member"
      decimals="INF"
      id="Fact001395"
      unitRef="Ratio">-0.1900</rr:BarChartLowestQuarterlyReturn>
    <rr:PerformanceTableHeading
      contextRef="From2024-04-302024-04-30_custom_S000003887Member"
      id="Fact001396">Average
annual total returns

(for
periods ended 12/31/23)</rr:PerformanceTableHeading>
    <rr:AverageAnnualReturnYear01
      contextRef="From2024-04-302024-04-30_custom_S000003887Member_custom_C000010869Member"
      decimals="INF"
      id="Fact001398"
      unitRef="Ratio">0.2916</rr:AverageAnnualReturnYear01>
    <rr:AverageAnnualReturnYear05
      contextRef="From2024-04-302024-04-30_custom_S000003887Member_custom_C000010869Member"
      decimals="INF"
      id="Fact001399"
      unitRef="Ratio">0.1645</rr:AverageAnnualReturnYear05>
    <rr:AverageAnnualReturnYear10
      contextRef="From2024-04-302024-04-30_custom_S000003887Member_custom_C000010869Member"
      decimals="INF"
      id="Fact001400"
      unitRef="Ratio">0.1224</rr:AverageAnnualReturnYear10>
    <rr:AverageAnnualReturnYear01
      contextRef="From2024-04-302024-04-30_custom_S000003887Member_custom_C000010870Member"
      decimals="INF"
      id="Fact001401"
      unitRef="Ratio">0.2886</rr:AverageAnnualReturnYear01>
    <rr:AverageAnnualReturnYear05
      contextRef="From2024-04-302024-04-30_custom_S000003887Member_custom_C000010870Member"
      decimals="INF"
      id="Fact001402"
      unitRef="Ratio">0.1615</rr:AverageAnnualReturnYear05>
    <rr:AverageAnnualReturnYear10
      contextRef="From2024-04-302024-04-30_custom_S000003887Member_custom_C000010870Member"
      decimals="INF"
      id="Fact001403"
      unitRef="Ratio">0.1195</rr:AverageAnnualReturnYear10>
    <rr:AverageAnnualReturnYear01
      contextRef="From2024-04-302024-04-30_custom_S000003887Member_custom_SP500IndexMember"
      decimals="INF"
      id="Fact001404"
      unitRef="Ratio">0.2629</rr:AverageAnnualReturnYear01>
    <rr:AverageAnnualReturnYear05
      contextRef="From2024-04-302024-04-30_custom_S000003887Member_custom_SP500IndexMember"
      decimals="INF"
      id="Fact001405"
      unitRef="Ratio">0.1569</rr:AverageAnnualReturnYear05>
    <rr:AverageAnnualReturnYear10
      contextRef="From2024-04-302024-04-30_custom_S000003887Member_custom_SP500IndexMember"
      decimals="INF"
      id="Fact001406"
      unitRef="Ratio">0.1203</rr:AverageAnnualReturnYear10>
    <rr:RiskReturnHeading
      contextRef="From2024-04-302024-04-30_custom_S000003883Member"
      id="Fact001408">Fund summary</rr:RiskReturnHeading>
    <rr:ObjectiveHeading
      contextRef="From2024-04-302024-04-30_custom_S000003883Member"
      id="Fact001409">Goal</rr:ObjectiveHeading>
    <rr:ObjectivePrimaryTextBlock
      contextRef="From2024-04-302024-04-30_custom_S000003883Member"
      id="Fact001410">&lt;p id="xdx_A84_err--ObjectivePrimaryTextBlock_zkKe1dePQE72" style="font: 10pt/1.5 Arial, Helvetica, Sans-Serif; margin: 0px 42px 9px; color: #000000; font-weight: 300; text-align: left"&gt;
Putnam VT Small Cap Growth Fund seeks capital appreciation.
&lt;/p&gt;

</rr:ObjectivePrimaryTextBlock>
    <rr:ExpenseHeading
      contextRef="From2024-04-302024-04-30_custom_S000003883Member"
      id="Fact001411">Fees and expenses</rr:ExpenseHeading>
    <rr:ExpenseNarrativeTextBlock
      contextRef="From2024-04-302024-04-30_custom_S000003883Member"
      id="Fact001412">&lt;p id="xdx_A82_err--ExpenseNarrativeTextBlock_zQtCo0kHv879" style="font: 10pt/1.5 Arial, Helvetica, Sans-Serif; margin: 0px 42px 9px; color: #000000; font-weight: 300; text-align: left"&gt;
The following table describes the fees and expenses you may pay if you buy, hold and sell shares of the fund. You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in the tables and examples below. The fees and expenses information does not reflect insurance-related charges or expenses borne by contract holders indirectly investing in the fund. If it did, expenses would be higher.
&lt;/p&gt;

</rr:ExpenseNarrativeTextBlock>
    <rr:OperatingExpensesCaption
      contextRef="From2024-04-302024-04-30_custom_S000003883Member"
      id="Fact001413">
Annual fund operating expenses



(expenses you pay each year as a percentage of the value of your investment)
</rr:OperatingExpensesCaption>
    <rr:ManagementFeesOverAssets
      contextRef="From2024-04-302024-04-30_custom_S000003883Member_custom_C000010861Member"
      decimals="INF"
      id="Fact001415"
      unitRef="Ratio">0.0062</rr:ManagementFeesOverAssets>
    <rr:DistributionAndService12b1FeesOverAssets
      contextRef="From2024-04-302024-04-30_custom_S000003883Member_custom_C000010861Member"
      decimals="INF"
      id="Fact001416"
      unitRef="Ratio">0</rr:DistributionAndService12b1FeesOverAssets>
    <rr:OtherExpensesOverAssets
      contextRef="From2024-04-302024-04-30_custom_S000003883Member_custom_C000010861Member"
      decimals="INF"
      id="Fact001417"
      unitRef="Ratio">0.0037</rr:OtherExpensesOverAssets>
    <rr:ExpensesOverAssets
      contextRef="From2024-04-302024-04-30_custom_S000003883Member_custom_C000010861Member"
      decimals="INF"
      id="Fact001418"
      unitRef="Ratio">0.0099</rr:ExpensesOverAssets>
    <rr:FeeWaiverOrReimbursementOverAssets
      contextRef="From2024-04-302024-04-30_custom_S000003883Member_custom_C000010861Member"
      decimals="INF"
      id="Fact001419"
      unitRef="Ratio">-0.0010</rr:FeeWaiverOrReimbursementOverAssets>
    <rr:NetExpensesOverAssets
      contextRef="From2024-04-302024-04-30_custom_S000003883Member_custom_C000010861Member"
      decimals="INF"
      id="Fact001420"
      unitRef="Ratio">0.0089</rr:NetExpensesOverAssets>
    <rr:ManagementFeesOverAssets
      contextRef="From2024-04-302024-04-30_custom_S000003883Member_custom_C000010862Member"
      decimals="INF"
      id="Fact001421"
      unitRef="Ratio">0.0062</rr:ManagementFeesOverAssets>
    <rr:DistributionAndService12b1FeesOverAssets
      contextRef="From2024-04-302024-04-30_custom_S000003883Member_custom_C000010862Member"
      decimals="INF"
      id="Fact001422"
      unitRef="Ratio">0.0025</rr:DistributionAndService12b1FeesOverAssets>
    <rr:OtherExpensesOverAssets
      contextRef="From2024-04-302024-04-30_custom_S000003883Member_custom_C000010862Member"
      decimals="INF"
      id="Fact001423"
      unitRef="Ratio">0.0037</rr:OtherExpensesOverAssets>
    <rr:ExpensesOverAssets
      contextRef="From2024-04-302024-04-30_custom_S000003883Member_custom_C000010862Member"
      decimals="INF"
      id="Fact001424"
      unitRef="Ratio">0.0124</rr:ExpensesOverAssets>
    <rr:FeeWaiverOrReimbursementOverAssets
      contextRef="From2024-04-302024-04-30_custom_S000003883Member_custom_C000010862Member"
      decimals="INF"
      id="Fact001425"
      unitRef="Ratio">-0.0010</rr:FeeWaiverOrReimbursementOverAssets>
    <rr:NetExpensesOverAssets
      contextRef="From2024-04-302024-04-30_custom_S000003883Member_custom_C000010862Member"
      decimals="INF"
      id="Fact001426"
      unitRef="Ratio">0.0114</rr:NetExpensesOverAssets>
    <rr:FeeWaiverOrReimbursementOverAssetsDateOfTermination
      contextRef="From2024-04-302024-04-30_custom_S000003883Member"
      id="Fact001428">4/30/25</rr:FeeWaiverOrReimbursementOverAssetsDateOfTermination>
    <rr:ExpenseExampleHeading
      contextRef="From2024-04-302024-04-30_custom_S000003883Member"
      id="Fact001429">Example</rr:ExpenseExampleHeading>
    <rr:ExpenseExampleNarrativeTextBlock
      contextRef="From2024-04-302024-04-30_custom_S000003883Member"
      id="Fact001430">&lt;p id="xdx_A88_err--ExpenseExampleNarrativeTextBlock_zqA1elhbg85g" style="font: 10pt/1.5 Arial, Helvetica, Sans-Serif; margin: 0px 42px 9px; color: #000000; font-weight: 300; text-align: left"&gt;
The following hypothetical example is intended to help you compare the cost of investing in the fund with the cost of investing in other funds. The example does not reflect insurance-related charges or expenses. If it did, expenses would be higher. It assumes that you invest $10,000 in the fund for the time periods indicated and then redeem or hold all your shares at the end of those periods. It assumes a 5% return on your investment each year and that the fund&#x2019;s operating expenses remain the same. Only the first year of each period in the example takes into account the expense reimbursement described above. Your actual costs may be higher or lower.
&lt;/p&gt;

</rr:ExpenseExampleNarrativeTextBlock>
    <rr:ExpenseExampleYear01
      contextRef="From2024-04-302024-04-30_custom_S000003883Member_custom_C000010861Member"
      decimals="0"
      id="Fact001432"
      unitRef="USD">91</rr:ExpenseExampleYear01>
    <rr:ExpenseExampleYear03
      contextRef="From2024-04-302024-04-30_custom_S000003883Member_custom_C000010861Member"
      decimals="0"
      id="Fact001433"
      unitRef="USD">305</rr:ExpenseExampleYear03>
    <rr:ExpenseExampleYear05
      contextRef="From2024-04-302024-04-30_custom_S000003883Member_custom_C000010861Member"
      decimals="0"
      id="Fact001434"
      unitRef="USD">537</rr:ExpenseExampleYear05>
    <rr:ExpenseExampleYear10
      contextRef="From2024-04-302024-04-30_custom_S000003883Member_custom_C000010861Member"
      decimals="0"
      id="Fact001435"
      unitRef="USD">1204</rr:ExpenseExampleYear10>
    <rr:ExpenseExampleYear01
      contextRef="From2024-04-302024-04-30_custom_S000003883Member_custom_C000010862Member"
      decimals="0"
      id="Fact001436"
      unitRef="USD">116</rr:ExpenseExampleYear01>
    <rr:ExpenseExampleYear03
      contextRef="From2024-04-302024-04-30_custom_S000003883Member_custom_C000010862Member"
      decimals="0"
      id="Fact001437"
      unitRef="USD">384</rr:ExpenseExampleYear03>
    <rr:ExpenseExampleYear05
      contextRef="From2024-04-302024-04-30_custom_S000003883Member_custom_C000010862Member"
      decimals="0"
      id="Fact001438"
      unitRef="USD">671</rr:ExpenseExampleYear05>
    <rr:ExpenseExampleYear10
      contextRef="From2024-04-302024-04-30_custom_S000003883Member_custom_C000010862Member"
      decimals="0"
      id="Fact001439"
      unitRef="USD">1491</rr:ExpenseExampleYear10>
    <rr:PortfolioTurnoverHeading
      contextRef="From2024-04-302024-04-30_custom_S000003883Member"
      id="Fact001440">Portfolio turnover</rr:PortfolioTurnoverHeading>
    <rr:PortfolioTurnoverTextBlock
      contextRef="From2024-04-302024-04-30_custom_S000003883Member"
      id="Fact001441">&lt;p id="xdx_A8D_err--PortfolioTurnoverTextBlock_zKLADbbYOHX6" style="font: 10pt/1.5 Arial, Helvetica, Sans-Serif; margin: 0px 42px 9px; color: #000000; font-weight: 300; text-align: left"&gt;
The fund pays transaction-related costs, such as commissions, when it buys and sells securities (or &#x201c;turns over&#x201d; its portfolio). A higher turnover rate may indicate higher transaction costs. These costs, which are not reflected in annual fund operating expenses or the above example, affect fund performance. The fund&#x2019;s turnover rate in the most recent fiscal year was &lt;span id="xdx_90C_err--PortfolioTurnoverRate_dU_c20240430__20240430__dei--LegalEntityAxis__custom--S000003883Member_zHQHNUp5sFcc"&gt;58%&lt;/span&gt;.
&lt;/p&gt;

</rr:PortfolioTurnoverTextBlock>
    <rr:PortfolioTurnoverRate
      contextRef="From2024-04-302024-04-30_custom_S000003883Member"
      decimals="INF"
      id="Fact001442"
      unitRef="Ratio">0.58</rr:PortfolioTurnoverRate>
    <rr:StrategyHeading
      contextRef="From2024-04-302024-04-30_custom_S000003883Member"
      id="Fact001443">Investments, risks, and performance</rr:StrategyHeading>
    <rr:StrategyNarrativeTextBlock
      contextRef="From2024-04-302024-04-30_custom_S000003883Member"
      id="Fact001444">&lt;p id="xdx_A8A_err--StrategyNarrativeTextBlock_zyWwwkkHN55g" style="font: 600 10pt/1.5 Arial, Helvetica, Sans-Serif; margin: 15px 42px 0px; color: #000000"&gt;
&lt;b&gt;Investments&lt;/b&gt;
&lt;/p&gt;

&lt;p style="font: 10pt/1.5 Arial, Helvetica, Sans-Serif; margin: 0px 42px 9px; color: #000000; font-weight: 300; text-align: left"&gt;&lt;span style="-sec-ix-redline: true"&gt;We
invest mainly in common stocks of small U.S. companies, with a focus on growth stocks. Growth stocks are stocks of companies whose earnings
are expected to grow faster than those of similar firms, and whose business growth and other characteristics may lead to an increase
in stock price. Under normal circumstances, we invest at least 80% of the fund&#x2019;s net&#160;assets in companies of a size similar
to those in the Russell 2000&#xae; Growth Index. This policy may be changed only after 60 days&#x2019; notice to shareholders. As of March
31, 2024, the index was composed of companies having market capitalizations of between approximately $16.6 million and $59.1 billion.&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt/1.5 Arial, Helvetica, Sans-Serif; margin: 0px 42px 9px; color: #000000; font-weight: 300; text-align: left"&gt;
We may consider, among other factors, a company&#x2019;s valuation, financial strength, growth potential, competitive position in its industry, projected future earnings, cash flows and dividends when deciding whether to buy or sell investments.
&lt;/p&gt;

</rr:StrategyNarrativeTextBlock>
    <rr:RiskHeading
      contextRef="From2024-04-302024-04-30_custom_S000003883Member"
      id="Fact001445">Risks</rr:RiskHeading>
    <rr:RiskTextBlock
      contextRef="From2024-04-302024-04-30_custom_S000003883Member"
      id="Fact001446">&lt;p id="xdx_A80_err--RiskTextBlock_zNTYtDsH9ctk" style="font: 10pt/1.5 Arial, Helvetica, Sans-Serif; margin: 0px 42px 9px; color: #000000; font-weight: 300; text-align: left"&gt;
&lt;span id="xdx_90B_err--RiskTextBlock_dU_c20240430__20240430__dei--LegalEntityAxis__custom--S000003883Member__rr--RiskAxis__rr--RiskLoseMoneyMember_zlrVGOHjesm2"&gt;It is important to understand that you can lose money by investing in the fund.&lt;/span&gt;
&lt;/p&gt;

&lt;p style="font: 10pt/1.5 Arial, Helvetica, Sans-Serif; margin: 0px 42px 9px; color: #000000; font-weight: 300; text-align: left"&gt;&lt;span style="-sec-ix-redline: true"&gt;The
value of investments in the fund&#x2019;s portfolio may fall or fail to rise over extended periods of time for a variety of reasons, including
general economic, political or financial market conditions, investor sentiment and market perceptions, government actions, geopolitical
events or changes, outbreaks of infectious illnesses or other widespread public health issues, and factors related to a specific issuer,
geography, industry or sector. These and other factors may lead to increased volatility and reduced liquidity in the fund&#x2019;s portfolio
holdings, may negatively impact the fund&#x2019;s performance, and may exacerbate other risks to which the fund is subject. Companies
whose stocks we believe are undervalued by the market may have experienced adverse business developments or may be subject to special
risks that have caused their stocks to be out of favor. Growth stocks may be more susceptible to earnings disappointments, and the market
may not favor growth-style investing. These risks are generally greater for small and midsize companies. From time to time, the fund
may invest a significant portion of its assets in companies in one or more related industries or sectors, which would make the fund more
vulnerable to adverse developments affecting those companies, industries or sectors.&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt/1.5 Arial, Helvetica, Sans-Serif; margin: 0px 42px 9px; color: #000000; font-weight: 300; text-align: left"&gt;
There is no guarantee that the investment techniques, analyses, or judgments that we apply in making investment decisions for the fund will produce the intended outcome or that the investments we select for the fund will perform as well as other securities that were not selected for the fund. We, or the fund&#x2019;s other service providers, may experience disruptions or operating errors that could negatively impact the fund.
&lt;/p&gt;



&lt;p&gt;
&lt;br/&gt;
&lt;br/&gt;
&lt;/p&gt;

&lt;div style="border-top: Black 1pt solid; margin: 18pt auto; font-size: 1pt"&gt;&#160;&lt;/div&gt;

&lt;p&gt;&lt;br/&gt;
&lt;br/&gt;
&lt;/p&gt;

&lt;p style="font: 10pt/1.5 Arial, Helvetica, Sans-Serif; margin: 0px 42px 9px; color: #000000; font-weight: 300; text-align: left"&gt;
The fund may be an investment option for mutual funds that are managed by Franklin Resources, Inc. (Franklin Templeton) and its affiliates as &#x201c;funds of funds&#x201d; and other investors with substantial investments in the fund. Such shareholders may at times be considered to control the fund. Dispositions of a large number of shares by these shareholders may adversely affect the fund&#x2019;s liquidity and net&#160;assets. These redemptions may also force the fund to sell securities, which may increase the fund&#x2019;s brokerage costs.
&lt;/p&gt;

&lt;p style="font: 10pt/1.5 Arial, Helvetica, Sans-Serif; margin: 0px 42px 9px; color: #000000; font-weight: 300; text-align: left"&gt;
The fund may not achieve its goal, and it is not intended to be a complete investment program. &lt;span id="xdx_90C_err--RiskTextBlock_dU_c20240430__20240430__dei--LegalEntityAxis__custom--S000003883Member__rr--RiskAxis__rr--RiskNotInsuredDepositoryInstitutionMember_zS8SYpxU3TQb"&gt;An investment in the fund is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency.&lt;/span&gt;
&lt;/p&gt;

</rr:RiskTextBlock>
    <rr:RiskTextBlock
      contextRef="From2024-04-302024-04-30_custom_S000003883Member_rr_RiskLoseMoneyMember"
      id="Fact001447">It is important to understand that you can lose money by investing in the fund.</rr:RiskTextBlock>
    <rr:RiskTextBlock
      contextRef="From2024-04-302024-04-30_custom_S000003883Member_rr_RiskNotInsuredDepositoryInstitutionMember"
      id="Fact001449">An investment in the fund is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency.</rr:RiskTextBlock>
    <rr:BarChartAndPerformanceTableHeading
      contextRef="From2024-04-302024-04-30_custom_S000003883Member"
      id="Fact001450">Performance</rr:BarChartAndPerformanceTableHeading>
    <rr:PerformanceNarrativeTextBlock
      contextRef="From2024-04-302024-04-30_custom_S000003883Member"
      id="Fact001451">&lt;p id="xdx_A82_err--PerformanceNarrativeTextBlock_znagnd13ZAti" style="font: 10pt/1.5 Arial, Helvetica, Sans-Serif; margin: 0px 42px 9px; color: #000000; font-weight: 300; text-align: left"&gt;
&lt;span id="xdx_90C_err--PerformanceInformationIllustratesVariabilityOfReturns_dU_c20240430__20240430__dei--LegalEntityAxis__custom--S000003883Member_zuJVb31xBZf"&gt;The performance information below gives some indication of the risks associated with an investment in the fund by showing the fund&#x2019;s performance year to year and over time.&lt;/span&gt; Before September&#160;17, 2018, the fund was managed with a materially different investment strategy and may have achieved materially different performance results under its current investment strategy from that shown for periods before this date. The performance information does not reflect insurance-related charges or expenses. If it did, performance would be lower. &lt;span id="xdx_90C_err--PerformancePastDoesNotIndicateFuture_dU_c20240430__20240430__dei--LegalEntityAxis__custom--S000003883Member_zMlydLbzOsS7"&gt;Please remember that past performance is not necessarily an indication of future results.&lt;/span&gt;
&lt;/p&gt;

</rr:PerformanceNarrativeTextBlock>
    <rr:PerformanceInformationIllustratesVariabilityOfReturns
      contextRef="From2024-04-302024-04-30_custom_S000003883Member"
      id="Fact001452">The performance information below gives some indication of the risks associated with an investment in the fund by showing the fund&#x2019;s performance year to year and over time.</rr:PerformanceInformationIllustratesVariabilityOfReturns>
    <rr:PerformancePastDoesNotIndicateFuture
      contextRef="From2024-04-302024-04-30_custom_S000003883Member"
      id="Fact001453">Please remember that past performance is not necessarily an indication of future results.</rr:PerformancePastDoesNotIndicateFuture>
    <rr:BarChartHeading
      contextRef="From2024-04-302024-04-30_custom_S000003883Member"
      id="Fact001454">Annual total returns for class IA shares</rr:BarChartHeading>
    <rr:AnnualReturn2014
      contextRef="From2024-04-302024-04-30_custom_S000003883Member_custom_C000010861Member"
      decimals="INF"
      id="Fact001457"
      unitRef="Ratio">0.0736</rr:AnnualReturn2014>
    <rr:AnnualReturn2015
      contextRef="From2024-04-302024-04-30_custom_S000003883Member_custom_C000010861Member"
      decimals="INF"
      id="Fact001459"
      unitRef="Ratio">-0.0737</rr:AnnualReturn2015>
    <rr:AnnualReturn2016
      contextRef="From2024-04-302024-04-30_custom_S000003883Member_custom_C000010861Member"
      decimals="INF"
      id="Fact001461"
      unitRef="Ratio">0.1577</rr:AnnualReturn2016>
    <rr:AnnualReturn2017
      contextRef="From2024-04-302024-04-30_custom_S000003883Member_custom_C000010861Member"
      decimals="INF"
      id="Fact001463"
      unitRef="Ratio">0.0826</rr:AnnualReturn2017>
    <rr:AnnualReturn2018
      contextRef="From2024-04-302024-04-30_custom_S000003883Member_custom_C000010861Member"
      decimals="INF"
      id="Fact001465"
      unitRef="Ratio">-0.1364</rr:AnnualReturn2018>
    <rr:AnnualReturn2019
      contextRef="From2024-04-302024-04-30_custom_S000003883Member_custom_C000010861Member"
      decimals="INF"
      id="Fact001467"
      unitRef="Ratio">0.3773</rr:AnnualReturn2019>
    <rr:AnnualReturn2020
      contextRef="From2024-04-302024-04-30_custom_S000003883Member_custom_C000010861Member"
      decimals="INF"
      id="Fact001469"
      unitRef="Ratio">0.4871</rr:AnnualReturn2020>
    <rr:AnnualReturn2021
      contextRef="From2024-04-302024-04-30_custom_S000003883Member_custom_C000010861Member"
      decimals="INF"
      id="Fact001471"
      unitRef="Ratio">0.1418</rr:AnnualReturn2021>
    <rr:AnnualReturn2022
      contextRef="From2024-04-302024-04-30_custom_S000003883Member_custom_C000010861Member"
      decimals="INF"
      id="Fact001473"
      unitRef="Ratio">-0.2811</rr:AnnualReturn2022>
    <rr:AnnualReturn2023
      contextRef="From2024-04-302024-04-30_custom_S000003883Member_custom_C000010861Member"
      decimals="INF"
      id="Fact001475"
      unitRef="Ratio">0.2346</rr:AnnualReturn2023>
    <rr:YearToDateReturnLabel
      contextRef="From2024-04-302024-04-30_custom_S000003883Member"
      id="Fact001476">Year-to-date performance
through</rr:YearToDateReturnLabel>
    <rr:BarChartYearToDateReturnDate
      contextRef="From2024-04-302024-04-30_custom_S000003883Member"
      id="Fact001477">2024-03-31</rr:BarChartYearToDateReturnDate>
    <rr:BarChartYearToDateReturn
      contextRef="From2024-04-302024-04-30_custom_S000003883Member"
      decimals="INF"
      id="Fact001478"
      unitRef="Ratio">0.1611</rr:BarChartYearToDateReturn>
    <rr:HighestQuarterlyReturnLabel
      contextRef="From2024-04-302024-04-30_custom_S000003883Member"
      id="Fact001479">Best calendar quarte</rr:HighestQuarterlyReturnLabel>
    <rr:BarChartHighestQuarterlyReturnDate
      contextRef="From2024-04-302024-04-30_custom_S000003883Member"
      id="Fact001480">2020-06-30</rr:BarChartHighestQuarterlyReturnDate>
    <rr:BarChartHighestQuarterlyReturn
      contextRef="From2024-04-302024-04-30_custom_S000003883Member"
      decimals="INF"
      id="Fact001481"
      unitRef="Ratio">0.3268</rr:BarChartHighestQuarterlyReturn>
    <rr:LowestQuarterlyReturnLabel
      contextRef="From2024-04-302024-04-30_custom_S000003883Member"
      id="Fact001482">Worst calendar quarter</rr:LowestQuarterlyReturnLabel>
    <rr:BarChartLowestQuarterlyReturnDate
      contextRef="From2024-04-302024-04-30_custom_S000003883Member"
      id="Fact001483">2018-12-31</rr:BarChartLowestQuarterlyReturnDate>
    <rr:BarChartLowestQuarterlyReturn
      contextRef="From2024-04-302024-04-30_custom_S000003883Member"
      decimals="INF"
      id="Fact001484"
      unitRef="Ratio">-0.2045</rr:BarChartLowestQuarterlyReturn>
    <rr:PerformanceTableHeading
      contextRef="From2024-04-302024-04-30_custom_S000003883Member"
      id="Fact001485">Average
annual total returns 
(for periods ended 12/31/23)</rr:PerformanceTableHeading>
    <rr:AverageAnnualReturnYear01
      contextRef="From2024-04-302024-04-30_custom_S000003883Member_custom_C000010861Member"
      decimals="INF"
      id="Fact001487"
      unitRef="Ratio">0.2346</rr:AverageAnnualReturnYear01>
    <rr:AverageAnnualReturnYear05
      contextRef="From2024-04-302024-04-30_custom_S000003883Member_custom_C000010861Member"
      decimals="INF"
      id="Fact001488"
      unitRef="Ratio">0.1572</rr:AverageAnnualReturnYear05>
    <rr:AverageAnnualReturnYear10
      contextRef="From2024-04-302024-04-30_custom_S000003883Member_custom_C000010861Member"
      decimals="INF"
      id="Fact001489"
      unitRef="Ratio">0.0837</rr:AverageAnnualReturnYear10>
    <rr:AverageAnnualReturnYear01
      contextRef="From2024-04-302024-04-30_custom_S000003883Member_custom_C000010862Member"
      decimals="INF"
      id="Fact001490"
      unitRef="Ratio">0.2314</rr:AverageAnnualReturnYear01>
    <rr:AverageAnnualReturnYear05
      contextRef="From2024-04-302024-04-30_custom_S000003883Member_custom_C000010862Member"
      decimals="INF"
      id="Fact001491"
      unitRef="Ratio">0.1544</rr:AverageAnnualReturnYear05>
    <rr:AverageAnnualReturnYear10
      contextRef="From2024-04-302024-04-30_custom_S000003883Member_custom_C000010862Member"
      decimals="INF"
      id="Fact001492"
      unitRef="Ratio">0.0810</rr:AverageAnnualReturnYear10>
    <rr:AverageAnnualReturnYear01
      contextRef="From2024-04-302024-04-30_custom_S000003883Member_custom_Russell2000GrowthIndexMember"
      decimals="INF"
      id="Fact001493"
      unitRef="Ratio">0.1866</rr:AverageAnnualReturnYear01>
    <rr:AverageAnnualReturnYear05
      contextRef="From2024-04-302024-04-30_custom_S000003883Member_custom_Russell2000GrowthIndexMember"
      decimals="INF"
      id="Fact001494"
      unitRef="Ratio">0.0922</rr:AverageAnnualReturnYear05>
    <rr:AverageAnnualReturnYear10
      contextRef="From2024-04-302024-04-30_custom_S000003883Member_custom_Russell2000GrowthIndexMember"
      decimals="INF"
      id="Fact001495"
      unitRef="Ratio">0.0716</rr:AverageAnnualReturnYear10>
    <rr:PerformanceTableClosingTextBlock
      contextRef="From2024-04-302024-04-30_custom_S000003883Member"
      id="Fact001496">&lt;div id="xdx_A89_err--PerformanceTableClosingTextBlock_z5N6iJkUzGV5"&gt;&lt;/div&gt;
&lt;table style="font: 300 9pt/1.5 Arial, Helvetica, Sans-Serif; margin-left: 10px; width: 90%"&gt;
&lt;tr style="vertical-align: top"&gt;
&lt;td style="width: 25px; text-align: right"&gt;


&lt;/td&gt;
&lt;td&gt;
Frank Russell Company is the source and owner of the trademarks, service marks and copyrights related to the Russell Indexes. Russell &#xae; is a trademark of Frank Russell Company.

&lt;/td&gt;

&lt;/tr&gt;
&lt;/table&gt;

</rr:PerformanceTableClosingTextBlock>
    <rr:RiskReturnHeading
      contextRef="From2024-04-302024-04-30_custom_S000003888Member"
      id="Fact001498">Fund summary</rr:RiskReturnHeading>
    <rr:ObjectiveHeading
      contextRef="From2024-04-302024-04-30_custom_S000003888Member"
      id="Fact001499">Goal</rr:ObjectiveHeading>
    <rr:ObjectivePrimaryTextBlock
      contextRef="From2024-04-302024-04-30_custom_S000003888Member"
      id="Fact001500">&lt;p id="xdx_A8D_err--ObjectivePrimaryTextBlock_zp0h7XRHCypi" style="font: 10pt/1.5 Arial, Helvetica, Sans-Serif; margin: 0px 42px 9px; color: #000000; font-weight: 300; text-align: left"&gt;
Putnam VT Small Cap Value Fund seeks capital appreciation.
&lt;/p&gt;

</rr:ObjectivePrimaryTextBlock>
    <rr:ExpenseHeading
      contextRef="From2024-04-302024-04-30_custom_S000003888Member"
      id="Fact001501">Fees and expenses</rr:ExpenseHeading>
    <rr:ExpenseNarrativeTextBlock
      contextRef="From2024-04-302024-04-30_custom_S000003888Member"
      id="Fact001502">&lt;p id="xdx_A8B_err--ExpenseNarrativeTextBlock_zb7dMg26OG7" style="font: 10pt/1.5 Arial, Helvetica, Sans-Serif; margin: 0px 42px 9px; color: #000000; font-weight: 300; text-align: left"&gt;
The following table describes the fees and expenses you may pay if you buy, hold and sell shares of the fund. You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in the tables and examples below. The fees and expenses information does not reflect insurance-related charges or expenses borne by contract holders indirectly investing in the fund. If it did, expenses would be higher.
&lt;/p&gt;

</rr:ExpenseNarrativeTextBlock>
    <rr:OperatingExpensesCaption
      contextRef="From2024-04-302024-04-30_custom_S000003888Member"
      id="Fact001503">
Annual fund operating expenses



(expenses you pay each year as a percentage of the value of your investment)
</rr:OperatingExpensesCaption>
    <rr:ManagementFeesOverAssets
      contextRef="From2024-04-302024-04-30_custom_S000003888Member_custom_C000010871Member"
      decimals="INF"
      id="Fact001505"
      unitRef="Ratio">0.0062</rr:ManagementFeesOverAssets>
    <rr:DistributionAndService12b1FeesOverAssets
      contextRef="From2024-04-302024-04-30_custom_S000003888Member_custom_C000010871Member"
      decimals="INF"
      id="Fact001506"
      unitRef="Ratio">0</rr:DistributionAndService12b1FeesOverAssets>
    <rr:OtherExpensesOverAssets
      contextRef="From2024-04-302024-04-30_custom_S000003888Member_custom_C000010871Member"
      decimals="INF"
      id="Fact001507"
      unitRef="Ratio">0.0016</rr:OtherExpensesOverAssets>
    <rr:ExpensesOverAssets
      contextRef="From2024-04-302024-04-30_custom_S000003888Member_custom_C000010871Member"
      decimals="INF"
      id="Fact001508"
      unitRef="Ratio">0.0078</rr:ExpensesOverAssets>
    <rr:ManagementFeesOverAssets
      contextRef="From2024-04-302024-04-30_custom_S000003888Member_custom_C000010872Member"
      decimals="INF"
      id="Fact001509"
      unitRef="Ratio">0.0062</rr:ManagementFeesOverAssets>
    <rr:DistributionAndService12b1FeesOverAssets
      contextRef="From2024-04-302024-04-30_custom_S000003888Member_custom_C000010872Member"
      decimals="INF"
      id="Fact001510"
      unitRef="Ratio">0.0025</rr:DistributionAndService12b1FeesOverAssets>
    <rr:OtherExpensesOverAssets
      contextRef="From2024-04-302024-04-30_custom_S000003888Member_custom_C000010872Member"
      decimals="INF"
      id="Fact001511"
      unitRef="Ratio">0.0016</rr:OtherExpensesOverAssets>
    <rr:ExpensesOverAssets
      contextRef="From2024-04-302024-04-30_custom_S000003888Member_custom_C000010872Member"
      decimals="INF"
      id="Fact001512"
      unitRef="Ratio">0.0103</rr:ExpensesOverAssets>
    <rr:ExpenseExampleHeading
      contextRef="From2024-04-302024-04-30_custom_S000003888Member"
      id="Fact001513">Example</rr:ExpenseExampleHeading>
    <rr:ExpenseExampleNarrativeTextBlock
      contextRef="From2024-04-302024-04-30_custom_S000003888Member"
      id="Fact001514">&lt;p id="xdx_A8B_err--ExpenseExampleNarrativeTextBlock_zJkKdZ3BYyqd" style="font: 10pt/1.5 Arial, Helvetica, Sans-Serif; margin: 0px 42px 9px; color: #000000; font-weight: 300; text-align: left"&gt;
The following hypothetical example is intended to help you compare the cost of investing in the fund with the cost of investing in other funds. The example does not reflect insurance-related charges or expenses. If it did, expenses would be higher. It assumes that you invest $10,000 in the fund for the time periods indicated and then redeem or hold all your shares at the end of those periods. It assumes a 5% return on your investment each year and that the fund&#x2019;s operating expenses remain the same. Your actual costs may be higher or lower.
&lt;/p&gt;

</rr:ExpenseExampleNarrativeTextBlock>
    <rr:ExpenseExampleYear01
      contextRef="From2024-04-302024-04-30_custom_S000003888Member_custom_C000010871Member"
      decimals="0"
      id="Fact001516"
      unitRef="USD">80</rr:ExpenseExampleYear01>
    <rr:ExpenseExampleYear03
      contextRef="From2024-04-302024-04-30_custom_S000003888Member_custom_C000010871Member"
      decimals="0"
      id="Fact001517"
      unitRef="USD">249</rr:ExpenseExampleYear03>
    <rr:ExpenseExampleYear05
      contextRef="From2024-04-302024-04-30_custom_S000003888Member_custom_C000010871Member"
      decimals="0"
      id="Fact001518"
      unitRef="USD">433</rr:ExpenseExampleYear05>
    <rr:ExpenseExampleYear10
      contextRef="From2024-04-302024-04-30_custom_S000003888Member_custom_C000010871Member"
      decimals="0"
      id="Fact001519"
      unitRef="USD">966</rr:ExpenseExampleYear10>
    <rr:ExpenseExampleYear01
      contextRef="From2024-04-302024-04-30_custom_S000003888Member_custom_C000010872Member"
      decimals="0"
      id="Fact001520"
      unitRef="USD">105</rr:ExpenseExampleYear01>
    <rr:ExpenseExampleYear03
      contextRef="From2024-04-302024-04-30_custom_S000003888Member_custom_C000010872Member"
      decimals="0"
      id="Fact001521"
      unitRef="USD">328</rr:ExpenseExampleYear03>
    <rr:ExpenseExampleYear05
      contextRef="From2024-04-302024-04-30_custom_S000003888Member_custom_C000010872Member"
      decimals="0"
      id="Fact001522"
      unitRef="USD">569</rr:ExpenseExampleYear05>
    <rr:ExpenseExampleYear10
      contextRef="From2024-04-302024-04-30_custom_S000003888Member_custom_C000010872Member"
      decimals="0"
      id="Fact001523"
      unitRef="USD">1259</rr:ExpenseExampleYear10>
    <rr:PortfolioTurnoverHeading
      contextRef="From2024-04-302024-04-30_custom_S000003888Member"
      id="Fact001524">Portfolio turnover</rr:PortfolioTurnoverHeading>
    <rr:PortfolioTurnoverTextBlock
      contextRef="From2024-04-302024-04-30_custom_S000003888Member"
      id="Fact001525">&lt;p id="xdx_A80_err--PortfolioTurnoverTextBlock_zV6WJJiPdoGj" style="font: 10pt/1.5 Arial, Helvetica, Sans-Serif; margin: 0px 42px 9px; color: #000000; font-weight: 300; text-align: left"&gt;&lt;span style="-sec-ix-redline: true"&gt;The
fund pays transaction-related costs, such as commissions, when it buys and sells securities (or &#x201c;turns over&#x201d; its portfolio).
A higher turnover rate may indicate higher transaction costs. These costs, which are not reflected in annual fund operating expenses
or the above example, affect fund performance. The fund&#x2019;s turnover rate in the most recent fiscal year was &lt;span id="xdx_90C_err--PortfolioTurnoverRate_dU_c20240430__20240430__dei--LegalEntityAxis__custom--S000003888Member_zXIrRhaiO137"&gt;80%&lt;/span&gt;.&lt;/span&gt;&lt;/p&gt;

</rr:PortfolioTurnoverTextBlock>
    <rr:PortfolioTurnoverRate
      contextRef="From2024-04-302024-04-30_custom_S000003888Member"
      decimals="INF"
      id="Fact001526"
      unitRef="Ratio">0.80</rr:PortfolioTurnoverRate>
    <rr:StrategyHeading
      contextRef="From2024-04-302024-04-30_custom_S000003888Member"
      id="Fact001527">Investments, risks, and performance</rr:StrategyHeading>
    <rr:StrategyNarrativeTextBlock
      contextRef="From2024-04-302024-04-30_custom_S000003888Member"
      id="Fact001528">&lt;p id="xdx_A82_err--StrategyNarrativeTextBlock_z3V2dlmdmqW8" style="font: 600 10pt/1.5 Arial, Helvetica, Sans-Serif; margin: 15px 42px 0px; color: #000000"&gt;
&lt;b&gt;Investments&lt;/b&gt;
&lt;/p&gt;

&lt;p style="font: 10pt/1.5 Arial, Helvetica, Sans-Serif; margin: 0px 42px 9px; color: #000000; font-weight: 300; text-align: left"&gt;&lt;span style="-sec-ix-redline: true"&gt;We
invest mainly in common stocks of small U.S. companies, with a focus on value stocks. Value stocks are issued by companies that we believe
are currently undervalued by the market. If we are correct and other investors ultimately recognize the value of the company, the price
of its stock may rise. Under normal circumstances, we invest at least 80% of the fund&#x2019;s net&#160;assets in companies of a size
similar to those in the Russell 2000 Value Index. This policy may be changed only after 60 days&#x2019; notice to shareholders. As of
March 31, 2024, the index was composed of companies having market capitalizations of between approximately $18.3 million and $16.9 billion.
We may consider, among other factors, a company&#x2019;s valuation, financial strength, growth potential, competitive position in its
industry, projected future earnings, cash flows and dividends when deciding whether to buy or sell investments.&lt;/span&gt;&lt;/p&gt;

</rr:StrategyNarrativeTextBlock>
    <rr:RiskHeading
      contextRef="From2024-04-302024-04-30_custom_S000003888Member"
      id="Fact001529">Risks</rr:RiskHeading>
    <rr:RiskTextBlock
      contextRef="From2024-04-302024-04-30_custom_S000003888Member"
      id="Fact001530">&lt;p id="xdx_A81_err--RiskTextBlock_zyLT8WniszRf" style="font: 10pt/1.5 Arial, Helvetica, Sans-Serif; margin: 0px 42px 9px; color: #000000; font-weight: 300; text-align: left"&gt;
&lt;span id="xdx_904_err--RiskTextBlock_dU_c20240430__20240430__dei--LegalEntityAxis__custom--S000003888Member__rr--RiskAxis__rr--RiskLoseMoneyMember_ziKp0sDuER31"&gt;It is important to understand that you can lose money by investing in the fund.&lt;/span&gt;
&lt;/p&gt;

&lt;p style="font: 10pt/1.5 Arial, Helvetica, Sans-Serif; margin: 0px 42px 9px; color: #000000; font-weight: 300; text-align: left"&gt;&lt;span style="-sec-ix-redline: true"&gt;The
value of investments in the fund&#x2019;s portfolio may fall or fail to rise over extended periods of time for a variety of reasons, including
general economic, political or financial market conditions, investor sentiment and market perceptions, government actions, geopolitical
events or changes, outbreaks of infectious illnesses or other widespread public health issues, and factors related to a specific issuer,
geography, industry or sector. These and other factors may lead to increased volatility and reduced liquidity in the fund&#x2019;s portfolio
holdings, may negatively impact the fund&#x2019;s performance, and may exacerbate other risks to which the fund is subject. Companies
whose stocks we believe are undervalued by the market may have experienced adverse business developments or may be subject to special
risks that have caused their stocks to be out of favor. Value stocks may fail to rebound, and the market may not favor value-style investing.
These risks are generally greater for small and midsize companies. From time to time, the fund may invest a significant portion of its
assets in companies in one or more related industries or sectors, which would make the fund more vulnerable to adverse developments affecting
those industries or sectors.&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt/1.5 Arial, Helvetica, Sans-Serif; margin: 0px 42px 9px; color: #000000; font-weight: 300; text-align: left"&gt;
There is no guarantee that the investment techniques, analyses, or judgments that we apply in making investment decisions for the fund will produce the intended outcome or that the investments we select for the fund will perform as well as other securities that were not selected for the fund. We, or the fund&#x2019;s other service providers, may experience disruptions or operating errors that could negatively impact the fund.
&lt;/p&gt;

&lt;p style="font: 10pt/1.5 Arial, Helvetica, Sans-Serif; margin: 0px 42px 9px; color: #000000; font-weight: 300; text-align: left"&gt;&lt;span style="-sec-ix-redline: true"&gt;The
fund may be an investment option for mutual funds that are managed by Franklin Resources, Inc. (Franklin Templeton) and its affiliates
as &#x201c;funds of funds&#x201d; and other investors with substantial investments in the fund. Such shareholders may at times be considered
to control the fund. Dispositions of a large number of shares by these shareholders may adversely affect the fund&#x2019;s liquidity and
net&#160;assets. These redemptions may also force the fund to sell securities, which may increase the fund&#x2019;s brokerage costs.&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt/1.5 Arial, Helvetica, Sans-Serif; margin: 0px 42px 9px; color: #000000; font-weight: 300; text-align: left"&gt;
The fund may not achieve its goal, and it is not intended to be a complete investment program. &lt;span id="xdx_909_err--RiskTextBlock_dU_c20240430__20240430__dei--LegalEntityAxis__custom--S000003888Member__rr--RiskAxis__rr--RiskNotInsuredDepositoryInstitutionMember_zBzF61h4Yak1"&gt;An investment in the fund is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency.&lt;/span&gt;
&lt;/p&gt;



&lt;p&gt;
&lt;br/&gt;
&lt;br/&gt;
&lt;/p&gt;

&lt;div style="border-top: Black 1pt solid; margin: 18pt auto; font-size: 1pt"&gt;&#160;&lt;/div&gt;

&lt;p&gt;&lt;br/&gt;
&lt;br/&gt;
&lt;/p&gt;

</rr:RiskTextBlock>
    <rr:RiskTextBlock
      contextRef="From2024-04-302024-04-30_custom_S000003888Member_rr_RiskLoseMoneyMember"
      id="Fact001531">It is important to understand that you can lose money by investing in the fund.</rr:RiskTextBlock>
    <rr:RiskTextBlock
      contextRef="From2024-04-302024-04-30_custom_S000003888Member_rr_RiskNotInsuredDepositoryInstitutionMember"
      id="Fact001532">An investment in the fund is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency.</rr:RiskTextBlock>
    <rr:BarChartAndPerformanceTableHeading
      contextRef="From2024-04-302024-04-30_custom_S000003888Member"
      id="Fact001534">Performance</rr:BarChartAndPerformanceTableHeading>
    <rr:PerformanceNarrativeTextBlock
      contextRef="From2024-04-302024-04-30_custom_S000003888Member"
      id="Fact001535">&lt;p id="xdx_A80_err--PerformanceNarrativeTextBlock_zoFI5bLqedGe" style="font: 10pt/1.5 Arial, Helvetica, Sans-Serif; margin: 0px 42px 9px; color: #000000; font-weight: 300; text-align: left"&gt;
&lt;span id="xdx_90C_err--PerformanceInformationIllustratesVariabilityOfReturns_dU_c20240430__20240430__dei--LegalEntityAxis__custom--S000003888Member_zIZibqZXrzzi"&gt;The performance information below gives some indication of the risks associated with an investment in the fund by showing the fund&#x2019;s performance year to year and over time.&lt;/span&gt; The performance information does not reflect insurance-related charges or expenses. If it did, performance would be lower. &lt;span id="xdx_90D_err--PerformancePastDoesNotIndicateFuture_dU_c20240430__20240430__dei--LegalEntityAxis__custom--S000003888Member_zvGVBcUFDvRc"&gt;Please remember that past performance is not necessarily an indication of future results.&lt;/span&gt; 
&lt;/p&gt;

</rr:PerformanceNarrativeTextBlock>
    <rr:PerformanceInformationIllustratesVariabilityOfReturns
      contextRef="From2024-04-302024-04-30_custom_S000003888Member"
      id="Fact001536">The performance information below gives some indication of the risks associated with an investment in the fund by showing the fund&#x2019;s performance year to year and over time.</rr:PerformanceInformationIllustratesVariabilityOfReturns>
    <rr:PerformancePastDoesNotIndicateFuture
      contextRef="From2024-04-302024-04-30_custom_S000003888Member"
      id="Fact001537">Please remember that past performance is not necessarily an indication of future results.</rr:PerformancePastDoesNotIndicateFuture>
    <rr:BarChartHeading
      contextRef="From2024-04-302024-04-30_custom_S000003888Member"
      id="Fact001538">Annual total returns for class IA shares</rr:BarChartHeading>
    <rr:AnnualReturn2014
      contextRef="From2024-04-302024-04-30_custom_S000003888Member_custom_C000010871Member"
      decimals="INF"
      id="Fact001541"
      unitRef="Ratio">0.0369</rr:AnnualReturn2014>
    <rr:AnnualReturn2015
      contextRef="From2024-04-302024-04-30_custom_S000003888Member_custom_C000010871Member"
      decimals="INF"
      id="Fact001543"
      unitRef="Ratio">-0.0390</rr:AnnualReturn2015>
    <rr:AnnualReturn2016
      contextRef="From2024-04-302024-04-30_custom_S000003888Member_custom_C000010871Member"
      decimals="INF"
      id="Fact001545"
      unitRef="Ratio">0.2770</rr:AnnualReturn2016>
    <rr:AnnualReturn2017
      contextRef="From2024-04-302024-04-30_custom_S000003888Member_custom_C000010871Member"
      decimals="INF"
      id="Fact001547"
      unitRef="Ratio">0.0815</rr:AnnualReturn2017>
    <rr:AnnualReturn2018
      contextRef="From2024-04-302024-04-30_custom_S000003888Member_custom_C000010871Member"
      decimals="INF"
      id="Fact001549"
      unitRef="Ratio">-0.1942</rr:AnnualReturn2018>
    <rr:AnnualReturn2019
      contextRef="From2024-04-302024-04-30_custom_S000003888Member_custom_C000010871Member"
      decimals="INF"
      id="Fact001551"
      unitRef="Ratio">0.2412</rr:AnnualReturn2019>
    <rr:AnnualReturn2020
      contextRef="From2024-04-302024-04-30_custom_S000003888Member_custom_C000010871Member"
      decimals="INF"
      id="Fact001553"
      unitRef="Ratio">0.0412</rr:AnnualReturn2020>
    <rr:AnnualReturn2021
      contextRef="From2024-04-302024-04-30_custom_S000003888Member_custom_C000010871Member"
      decimals="INF"
      id="Fact001555"
      unitRef="Ratio">0.4037</rr:AnnualReturn2021>
    <rr:AnnualReturn2022
      contextRef="From2024-04-302024-04-30_custom_S000003888Member_custom_C000010871Member"
      decimals="INF"
      id="Fact001557"
      unitRef="Ratio">-0.1280</rr:AnnualReturn2022>
    <rr:AnnualReturn2023
      contextRef="From2024-04-302024-04-30_custom_S000003888Member_custom_C000010871Member"
      decimals="INF"
      id="Fact001559"
      unitRef="Ratio">0.2413</rr:AnnualReturn2023>
    <rr:YearToDateReturnLabel
      contextRef="From2024-04-302024-04-30_custom_S000003888Member"
      id="Fact001560">Year-to-date performance
through</rr:YearToDateReturnLabel>
    <rr:BarChartYearToDateReturnDate
      contextRef="From2024-04-302024-04-30_custom_S000003888Member"
      id="Fact001561">2024-03-31</rr:BarChartYearToDateReturnDate>
    <rr:BarChartYearToDateReturn
      contextRef="From2024-04-302024-04-30_custom_S000003888Member"
      decimals="INF"
      id="Fact001562"
      unitRef="Ratio">0.0204</rr:BarChartYearToDateReturn>
    <rr:HighestQuarterlyReturnLabel
      contextRef="From2024-04-302024-04-30_custom_S000003888Member"
      id="Fact001563">Best calendar quarter</rr:HighestQuarterlyReturnLabel>
    <rr:BarChartHighestQuarterlyReturnDate
      contextRef="From2024-04-302024-04-30_custom_S000003888Member"
      id="Fact001564">2020-12-31</rr:BarChartHighestQuarterlyReturnDate>
    <rr:BarChartHighestQuarterlyReturn
      contextRef="From2024-04-302024-04-30_custom_S000003888Member"
      decimals="INF"
      id="Fact001565"
      unitRef="Ratio">0.3430</rr:BarChartHighestQuarterlyReturn>
    <rr:LowestQuarterlyReturnLabel
      contextRef="From2024-04-302024-04-30_custom_S000003888Member"
      id="Fact001566">Worst calendar quarter</rr:LowestQuarterlyReturnLabel>
    <rr:BarChartLowestQuarterlyReturnDate
      contextRef="From2024-04-302024-04-30_custom_S000003888Member"
      id="Fact001567">2020-03-31</rr:BarChartLowestQuarterlyReturnDate>
    <rr:BarChartLowestQuarterlyReturn
      contextRef="From2024-04-302024-04-30_custom_S000003888Member"
      decimals="INF"
      id="Fact001568"
      unitRef="Ratio">-0.4027</rr:BarChartLowestQuarterlyReturn>
    <rr:PerformanceTableHeading
      contextRef="From2024-04-302024-04-30_custom_S000003888Member"
      id="Fact001569">Average
annual total returns

(for
periods ended 12/31/23)</rr:PerformanceTableHeading>
    <rr:AverageAnnualReturnYear01
      contextRef="From2024-04-302024-04-30_custom_S000003888Member_custom_C000010871Member"
      decimals="INF"
      id="Fact001571"
      unitRef="Ratio">0.2413</rr:AverageAnnualReturnYear01>
    <rr:AverageAnnualReturnYear05
      contextRef="From2024-04-302024-04-30_custom_S000003888Member_custom_C000010871Member"
      decimals="INF"
      id="Fact001572"
      unitRef="Ratio">0.1445</rr:AverageAnnualReturnYear05>
    <rr:AverageAnnualReturnYear10
      contextRef="From2024-04-302024-04-30_custom_S000003888Member_custom_C000010871Member"
      decimals="INF"
      id="Fact001573"
      unitRef="Ratio">0.0809</rr:AverageAnnualReturnYear10>
    <rr:AverageAnnualReturnYear01
      contextRef="From2024-04-302024-04-30_custom_S000003888Member_custom_C000010872Member"
      decimals="INF"
      id="Fact001574"
      unitRef="Ratio">0.2375</rr:AverageAnnualReturnYear01>
    <rr:AverageAnnualReturnYear05
      contextRef="From2024-04-302024-04-30_custom_S000003888Member_custom_C000010872Member"
      decimals="INF"
      id="Fact001575"
      unitRef="Ratio">0.1417</rr:AverageAnnualReturnYear05>
    <rr:AverageAnnualReturnYear10
      contextRef="From2024-04-302024-04-30_custom_S000003888Member_custom_C000010872Member"
      decimals="INF"
      id="Fact001576"
      unitRef="Ratio">0.0782</rr:AverageAnnualReturnYear10>
    <rr:AverageAnnualReturnYear01
      contextRef="From2024-04-302024-04-30_custom_S000003888Member_custom_Russell2000ValueIndexMember"
      decimals="INF"
      id="Fact001577"
      unitRef="Ratio">0.1465</rr:AverageAnnualReturnYear01>
    <rr:AverageAnnualReturnYear05
      contextRef="From2024-04-302024-04-30_custom_S000003888Member_custom_Russell2000ValueIndexMember"
      decimals="INF"
      id="Fact001578"
      unitRef="Ratio">0.1000</rr:AverageAnnualReturnYear05>
    <rr:AverageAnnualReturnYear10
      contextRef="From2024-04-302024-04-30_custom_S000003888Member_custom_Russell2000ValueIndexMember"
      decimals="INF"
      id="Fact001579"
      unitRef="Ratio">0.0676</rr:AverageAnnualReturnYear10>
    <rr:PerformanceTableClosingTextBlock
      contextRef="From2024-04-302024-04-30_custom_S000003888Member"
      id="Fact001580">&lt;div id="xdx_A8E_err--PerformanceTableClosingTextBlock_zpmNFLHIs5Dl"&gt;&lt;/div&gt;
&lt;table style="font: 300 9pt/1.5 Arial, Helvetica, Sans-Serif; margin-left: 10px; width: 90%"&gt;
&lt;tr style="vertical-align: top"&gt;
&lt;td style="width: 25px; text-align: right"&gt;


&lt;/td&gt;
&lt;td&gt;
Frank Russell Company is the source and owner of the trademarks, service marks and copyrights related to the Russell Indexes. Russell&#xae; is a trademark of Frank Russell Company.

&lt;/td&gt;

&lt;/tr&gt;
&lt;/table&gt;

</rr:PerformanceTableClosingTextBlock>
    <rr:RiskReturnHeading
      contextRef="From2024-04-302024-04-30_custom_S000003881Member"
      id="Fact001582">Fund summary</rr:RiskReturnHeading>
    <rr:ObjectiveHeading
      contextRef="From2024-04-302024-04-30_custom_S000003881Member"
      id="Fact001583">Goal</rr:ObjectiveHeading>
    <rr:ObjectivePrimaryTextBlock
      contextRef="From2024-04-302024-04-30_custom_S000003881Member"
      id="Fact001584">&lt;p id="xdx_A84_err--ObjectivePrimaryTextBlock_zISr6g1mtofh" style="font: 10pt/1.5 Arial, Helvetica, Sans-Serif; margin: 0px 42px 9px; color: #000000; font-weight: 300; text-align: left"&gt;
Putnam VT Sustainable Future Fund seeks long-term capital&#160;appreciation.
&lt;/p&gt;

</rr:ObjectivePrimaryTextBlock>
    <rr:ExpenseHeading
      contextRef="From2024-04-302024-04-30_custom_S000003881Member"
      id="Fact001585">Fees and expenses</rr:ExpenseHeading>
    <rr:ExpenseNarrativeTextBlock
      contextRef="From2024-04-302024-04-30_custom_S000003881Member"
      id="Fact001586">&lt;p id="xdx_A81_err--ExpenseNarrativeTextBlock_zGGmWxw9SbN1" style="font: 10pt/1.5 Arial, Helvetica, Sans-Serif; margin: 0px 42px 9px; color: #000000; font-weight: 300; text-align: left"&gt;
The following table describes the fees and expenses you may pay if you buy, hold and sell shares of the fund. You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in the tables and examples below. The fees and expenses information does not reflect insurance-related charges or expenses borne by contract holders indirectly investing in the fund. If it did, expenses would be higher.
&lt;/p&gt;

</rr:ExpenseNarrativeTextBlock>
    <rr:OperatingExpensesCaption
      contextRef="From2024-04-302024-04-30_custom_S000003881Member"
      id="Fact001587">
Annual fund operating expenses



 (expenses you pay each year as a percentage of the value of your investment)
</rr:OperatingExpensesCaption>
    <rr:ManagementFeesOverAssets
      contextRef="From2024-04-302024-04-30_custom_S000003881Member_custom_C000010857Member"
      decimals="INF"
      id="Fact001589"
      unitRef="Ratio">0.0055</rr:ManagementFeesOverAssets>
    <rr:DistributionAndService12b1FeesOverAssets
      contextRef="From2024-04-302024-04-30_custom_S000003881Member_custom_C000010857Member"
      decimals="INF"
      id="Fact001590"
      unitRef="Ratio">0</rr:DistributionAndService12b1FeesOverAssets>
    <rr:OtherExpensesOverAssets
      contextRef="From2024-04-302024-04-30_custom_S000003881Member_custom_C000010857Member"
      decimals="INF"
      id="Fact001591"
      unitRef="Ratio">0.0033</rr:OtherExpensesOverAssets>
    <rr:ExpensesOverAssets
      contextRef="From2024-04-302024-04-30_custom_S000003881Member_custom_C000010857Member"
      decimals="INF"
      id="Fact001592"
      unitRef="Ratio">0.0088</rr:ExpensesOverAssets>
    <rr:FeeWaiverOrReimbursementOverAssets
      contextRef="From2024-04-302024-04-30_custom_S000003881Member_custom_C000010857Member"
      decimals="INF"
      id="Fact001593"
      unitRef="Ratio">-0.0006</rr:FeeWaiverOrReimbursementOverAssets>
    <rr:NetExpensesOverAssets
      contextRef="From2024-04-302024-04-30_custom_S000003881Member_custom_C000010857Member"
      decimals="INF"
      id="Fact001594"
      unitRef="Ratio">0.0082</rr:NetExpensesOverAssets>
    <rr:ManagementFeesOverAssets
      contextRef="From2024-04-302024-04-30_custom_S000003881Member_custom_C000010858Member"
      decimals="INF"
      id="Fact001595"
      unitRef="Ratio">0.0055</rr:ManagementFeesOverAssets>
    <rr:DistributionAndService12b1FeesOverAssets
      contextRef="From2024-04-302024-04-30_custom_S000003881Member_custom_C000010858Member"
      decimals="INF"
      id="Fact001596"
      unitRef="Ratio">0.0025</rr:DistributionAndService12b1FeesOverAssets>
    <rr:OtherExpensesOverAssets
      contextRef="From2024-04-302024-04-30_custom_S000003881Member_custom_C000010858Member"
      decimals="INF"
      id="Fact001597"
      unitRef="Ratio">0.0033</rr:OtherExpensesOverAssets>
    <rr:ExpensesOverAssets
      contextRef="From2024-04-302024-04-30_custom_S000003881Member_custom_C000010858Member"
      decimals="INF"
      id="Fact001598"
      unitRef="Ratio">0.0113</rr:ExpensesOverAssets>
    <rr:FeeWaiverOrReimbursementOverAssets
      contextRef="From2024-04-302024-04-30_custom_S000003881Member_custom_C000010858Member"
      decimals="INF"
      id="Fact001599"
      unitRef="Ratio">-0.0006</rr:FeeWaiverOrReimbursementOverAssets>
    <rr:NetExpensesOverAssets
      contextRef="From2024-04-302024-04-30_custom_S000003881Member_custom_C000010858Member"
      decimals="INF"
      id="Fact001600"
      unitRef="Ratio">0.0107</rr:NetExpensesOverAssets>
    <rr:FeeWaiverOrReimbursementOverAssetsDateOfTermination
      contextRef="From2024-04-302024-04-30_custom_S000003881Member"
      id="Fact001602">4/30/25</rr:FeeWaiverOrReimbursementOverAssetsDateOfTermination>
    <rr:ExpenseExampleHeading
      contextRef="From2024-04-302024-04-30_custom_S000003881Member"
      id="Fact001603">Example</rr:ExpenseExampleHeading>
    <rr:ExpenseExampleNarrativeTextBlock
      contextRef="From2024-04-302024-04-30_custom_S000003881Member"
      id="Fact001604">&lt;p id="xdx_A85_err--ExpenseExampleNarrativeTextBlock_zTT93RMRldOf" style="font: 10pt/1.5 Arial, Helvetica, Sans-Serif; margin: 0px 42px 9px; color: #000000; font-weight: 300; text-align: left"&gt;
The following hypothetical example is intended to help you compare the cost of investing in the fund with the cost of investing in other funds. The example does not reflect insurance-related charges or expenses. If it did, expenses would be higher. It assumes that you invest $10,000 in the fund for the time periods indicated and then redeem or hold all your shares at the end of those periods. It assumes a 5% return on your investment each year and that the fund&#x2019;s operating expenses remain the same. Your actual costs may be higher or lower.
&lt;/p&gt;

</rr:ExpenseExampleNarrativeTextBlock>
    <rr:ExpenseExampleYear01
      contextRef="From2024-04-302024-04-30_custom_S000003881Member_custom_C000010857Member"
      decimals="0"
      id="Fact001606"
      unitRef="USD">84</rr:ExpenseExampleYear01>
    <rr:ExpenseExampleYear03
      contextRef="From2024-04-302024-04-30_custom_S000003881Member_custom_C000010857Member"
      decimals="0"
      id="Fact001607"
      unitRef="USD">275</rr:ExpenseExampleYear03>
    <rr:ExpenseExampleYear05
      contextRef="From2024-04-302024-04-30_custom_S000003881Member_custom_C000010857Member"
      decimals="0"
      id="Fact001608"
      unitRef="USD">482</rr:ExpenseExampleYear05>
    <rr:ExpenseExampleYear10
      contextRef="From2024-04-302024-04-30_custom_S000003881Member_custom_C000010857Member"
      decimals="0"
      id="Fact001609"
      unitRef="USD">1079</rr:ExpenseExampleYear10>
    <rr:ExpenseExampleYear01
      contextRef="From2024-04-302024-04-30_custom_S000003881Member_custom_C000010858Member"
      decimals="0"
      id="Fact001610"
      unitRef="USD">109</rr:ExpenseExampleYear01>
    <rr:ExpenseExampleYear03
      contextRef="From2024-04-302024-04-30_custom_S000003881Member_custom_C000010858Member"
      decimals="0"
      id="Fact001611"
      unitRef="USD">353</rr:ExpenseExampleYear03>
    <rr:ExpenseExampleYear05
      contextRef="From2024-04-302024-04-30_custom_S000003881Member_custom_C000010858Member"
      decimals="0"
      id="Fact001612"
      unitRef="USD">616</rr:ExpenseExampleYear05>
    <rr:ExpenseExampleYear10
      contextRef="From2024-04-302024-04-30_custom_S000003881Member_custom_C000010858Member"
      decimals="0"
      id="Fact001613"
      unitRef="USD">1369</rr:ExpenseExampleYear10>
    <rr:PortfolioTurnoverHeading
      contextRef="From2024-04-302024-04-30_custom_S000003881Member"
      id="Fact001614">Portfolio turnover</rr:PortfolioTurnoverHeading>
    <rr:PortfolioTurnoverTextBlock
      contextRef="From2024-04-302024-04-30_custom_S000003881Member"
      id="Fact001615">&lt;p id="xdx_A8C_err--PortfolioTurnoverTextBlock_zUsF1g4vHo9h" style="font: 10pt/1.5 Arial, Helvetica, Sans-Serif; margin: 0px 42px 9px; color: #000000; font-weight: 300; text-align: left"&gt;&lt;span style="-sec-ix-redline: true"&gt;The
fund pays transaction-related costs, such as commissions, when it buys and sells securities (or &#x201c;turns over&#x201d; its portfolio).
A higher turnover rate may indicate higher transaction costs. These costs, which are not reflected in annual fund operating expenses
or the above example, affect fund performance. The fund&#x2019;s turnover rate in the most recent fiscal year was &lt;span id="xdx_90D_err--PortfolioTurnoverRate_dU_c20240430__20240430__dei--LegalEntityAxis__custom--S000003881Member_zfm8igtFmuh6"&gt;44%&lt;/span&gt;.&lt;/span&gt;&lt;/p&gt;

</rr:PortfolioTurnoverTextBlock>
    <rr:PortfolioTurnoverRate
      contextRef="From2024-04-302024-04-30_custom_S000003881Member"
      decimals="INF"
      id="Fact001616"
      unitRef="Ratio">0.44</rr:PortfolioTurnoverRate>
    <rr:StrategyHeading
      contextRef="From2024-04-302024-04-30_custom_S000003881Member"
      id="Fact001617">Investments, risks, and performance</rr:StrategyHeading>
    <rr:StrategyNarrativeTextBlock
      contextRef="From2024-04-302024-04-30_custom_S000003881Member"
      id="Fact001618">&lt;p id="xdx_A87_err--StrategyNarrativeTextBlock_zskmAnicI6eb" style="font: 600 10pt/1.5 Arial, Helvetica, Sans-Serif; margin: 15px 42px 0px; color: #000000"&gt;
&lt;b&gt;Investments&lt;/b&gt;
&lt;/p&gt;

&lt;p style="font: 10pt/1.5 Arial, Helvetica, Sans-Serif; margin: 0px 42px 9px; color: #000000; font-weight: 300; text-align: left"&gt;
We invest mainly in common stocks of U.S. companies of any size, with a focus on companies whose products and services we believe provide solutions that directly contribute to sustainable social, environmental and economic development (Solutions Companies). Stocks of this type of company are typically, but not always, considered to be growth stocks. Growth stocks are stocks of companies whose revenues, earnings, or cash flows are expected to grow faster than those of similar firms, and whose business growth and other characteristics may lead to an increase in stock price. We may consider, among other factors, a company&#x2019;s impact on sustainable environmental, social and economic development (as described below), valuation, financial strength, growth potential, competitive position in its industry, projected future earnings, cash flows and dividends when deciding whether to buy or sell investments. We may also invest in non-U.S. companies.
&lt;/p&gt;

&lt;p style="font: 10pt/1.5 Arial, Helvetica, Sans-Serif; margin: 0px 42px 9px; color: #000000; font-weight: 300; text-align: left"&gt;&lt;span style="-sec-ix-redline: true"&gt;Our
approach to sustainable investing incorporates fundamental research together with consideration of sustainable environmental, social
and economic development impact. We believe that companies whose products and services produce positive environmental, social and economic
development impact also often demonstrate potential for strong financial growth. Under normal circumstances, the fund invests at least
80% of the value of its net&#160;assets in securities that meet our sustainability criteria. These criteria are based on a proprietary
sustainability solutions map that links to the United Nations Sustainable Development Goals (SDGs). In applying these criteria, we will
assign each company a proprietary environmental, social and/or corporate governance (ESG) rating ranging from 1 to 4 (1 indicating the
highest (best) ESG rating and 4 indicating the lowest (worst) ESG rating). In order to meet our sustainability criteria for purposes
of this investment policy, a company must be rated 2 or 1 by us. This policy is non-fundamental and may be changed only after 60 days&#x2019;
notice to shareholders. In selecting each investment, we consider the extent to which a company&#x2019;s products or services may provide
solutions to forward-looking sustainability needs, creating positive impact in environmental, social and economic development areas.
Environmental impacts may include, for example, reduction of carbon emissions and improved water quality. Social impacts may include,
for example, improvements in employee well-being, supplier standards, or access to products, information, or security. Economic development
impacts may include, for example, stakeholder analysis and shared value approaches to business practices, access to economic opportunity,
or improvements in operational effectiveness or efficiency.&lt;/span&gt;&lt;/p&gt;

</rr:StrategyNarrativeTextBlock>
    <rr:RiskHeading
      contextRef="From2024-04-302024-04-30_custom_S000003881Member"
      id="Fact001619">Risks</rr:RiskHeading>
    <rr:RiskTextBlock
      contextRef="From2024-04-302024-04-30_custom_S000003881Member"
      id="Fact001620">&lt;p id="xdx_A88_err--RiskTextBlock_z3bBDfkqvj" style="font: 10pt/1.5 Arial, Helvetica, Sans-Serif; margin: 0px 42px 9px; color: #000000; font-weight: 300; text-align: left"&gt;
&lt;span id="xdx_904_err--RiskTextBlock_dU_c20240430__20240430__dei--LegalEntityAxis__custom--S000003881Member__rr--RiskAxis__rr--RiskLoseMoneyMember_zX4oILWHMaG1"&gt;It is important to understand that you can lose money by investing in the fund.&lt;/span&gt;
&lt;/p&gt;



&lt;p&gt;
&lt;br/&gt;
&lt;br/&gt;
&lt;/p&gt;

&lt;div style="border-top: Black 1pt solid; margin: 18pt auto; font-size: 1pt"&gt;&#160;&lt;/div&gt;

&lt;p&gt;&lt;br/&gt;
&lt;br/&gt;
&lt;/p&gt;

&lt;p style="font: 10pt/1.5 Arial, Helvetica, Sans-Serif; margin: 0px 42px 9px; color: #000000; font-weight: 300; text-align: left"&gt;
The value of investments in the fund&#x2019;s portfolio may fall or fail to rise over extended periods of time for a variety of reasons, including general economic, political or financial market conditions, investor sentiment and market perceptions, government actions, geopolitical events or changes, outbreaks of infectious illnesses or other widespread public health issues, and factors related to a specific issuer, geography, industry or sector. These and other factors may lead to increased volatility and reduced liquidity in the fund&#x2019;s portfolio holdings, may negatively impact the fund&#x2019;s performance, and may exacerbate other risks to which the fund is subject.
&lt;/p&gt;

&lt;p style="font: 10pt/1.5 Arial, Helvetica, Sans-Serif; margin: 0px 42px 9px; color: #000000; font-weight: 300; text-align: left"&gt;&lt;span style="-sec-ix-redline: true"&gt;The
value of a company&#x2019;s stock may fall or fail to rise as a result of factors directly relating to that company, such as decisions
made by its management or lower demand for the company&#x2019;s products or services. A stock&#x2019;s value may also fall because of factors
affecting not just the company, but also other companies in the same industry or in a number of different industries, such as increases
in production costs.&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt/1.5 Arial, Helvetica, Sans-Serif; margin: 0px 42px 9px; color: #000000; font-weight: 300; text-align: left"&gt;&lt;span style="-sec-ix-redline: true"&gt;Growth
stocks may be more susceptible to earnings disappointments and the market may not favor growth-style investing. These risks are generally
greater for small and midsized companies. From time to time, the fund may invest a significant portion of its assets in companies in
one or more related industries or sectors, which would make the fund more vulnerable to adverse developments affecting those companies,
industries or sectors.&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt/1.5 Arial, Helvetica, Sans-Serif; margin: 0px 42px 9px; color: #000000; font-weight: 300; text-align: left"&gt;
The value of international investments traded in foreign currencies may be adversely impacted by fluctuations in exchange rates. International investments, particularly investments in emerging markets, may carry risks associated with potentially less stable economies or governments (such as the risk of seizure by a foreign government, the imposition of currency or other restrictions, or high levels of inflation), and may be or become illiquid.
&lt;/p&gt;

&lt;p style="font: 10pt/1.5 Arial, Helvetica, Sans-Serif; margin: 0px 42px 9px; color: #000000; font-weight: 300; text-align: left"&gt;
Investing with a focus on Solutions Companies, whose products and services may provide solutions that directly impact sustainable environmental, social and economic development, may result in the fund investing in certain types of companies, industries or sectors that the market may not favor. In evaluating an investment opportunity, we may make investment decisions based on information and data that is incomplete or inaccurate. Sustainability and ESG factors are not uniformly defined and applying such factors involves subjective assessments. Sustainability and ESG scorings and assessments of issuers can vary across third-party data providers and may change over time. In addition, a company&#x2019;s business practices, products or services may change over time. As a result of these possibilities, among others, the fund may temporarily hold securities that are inconsistent with the fund&#x2019;s sustainable investment criteria. Regulatory changes or interpretations regarding the definitions and/or use of ESG or other sustainability criteria could have a material adverse effect on the fund&#x2019;s ability to invest in accordance with its investment policies and/or achieve its investment objective, as well as the ability of certain classes of investors to invest in funds, such as the fund, whose strategies include ESG or other sustainability criteria.
&lt;/p&gt;

&lt;p style="font: 10pt/1.5 Arial, Helvetica, Sans-Serif; margin: 0px 42px 9px; color: #000000; font-weight: 300; text-align: left"&gt;
There is no guarantee that the investment techniques, analyses, or judgments that we apply in making investment decisions for the fund will produce the intended outcome or that the investments we select for the fund will perform as well as other securities that were not selected for the fund. We, or the fund&#x2019;s other service providers, may experience disruptions or operating errors that could negatively impact the fund. 
&lt;/p&gt;

&lt;p style="font: 10pt/1.5 Arial, Helvetica, Sans-Serif; margin: 0px 42px 9px; color: #000000; font-weight: 300; text-align: left"&gt;&lt;span style="-sec-ix-redline: true"&gt;The
fund may be an investment option for mutual funds that are managed by Franklin Resources, Inc. (Franklin Templeton) and its affiliates
as &#x201c;funds of funds&#x201d; and other investors with substantial investments in the fund. Such shareholders may at times be considered
to control the fund. Dispositions of a large number of shares by these shareholders may adversely affect the fund&#x2019;s liquidity and
net&#160;assets. These redemptions may also force the fund to sell securities, which may increase the fund&#x2019;s brokerage costs.&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt/1.5 Arial, Helvetica, Sans-Serif; margin: 0px 42px 9px; color: #000000; font-weight: 300; text-align: left"&gt;
The fund may not achieve its goal, and it is not intended to be a complete investment program. &lt;span id="xdx_901_err--RiskTextBlock_dU_c20240430__20240430__dei--LegalEntityAxis__custom--S000003881Member__rr--RiskAxis__rr--RiskNotInsuredDepositoryInstitutionMember_zsmSmK4ZD8pl"&gt;An investment in the fund is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency.&lt;/span&gt;
&lt;/p&gt;

</rr:RiskTextBlock>
    <rr:RiskTextBlock
      contextRef="From2024-04-302024-04-30_custom_S000003881Member_rr_RiskLoseMoneyMember"
      id="Fact001621">It is important to understand that you can lose money by investing in the fund.</rr:RiskTextBlock>
    <rr:RiskTextBlock
      contextRef="From2024-04-302024-04-30_custom_S000003881Member_rr_RiskNotInsuredDepositoryInstitutionMember"
      id="Fact001623">An investment in the fund is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency.</rr:RiskTextBlock>
    <rr:BarChartAndPerformanceTableHeading
      contextRef="From2024-04-302024-04-30_custom_S000003881Member"
      id="Fact001624">Performance</rr:BarChartAndPerformanceTableHeading>
    <rr:PerformanceNarrativeTextBlock
      contextRef="From2024-04-302024-04-30_custom_S000003881Member"
      id="Fact001625">&lt;p id="xdx_A8D_err--PerformanceNarrativeTextBlock_z3gAQwW8sQTi" style="font: 10pt/1.5 Arial, Helvetica, Sans-Serif; margin: 0px 42px 9px; color: #000000; font-weight: 300; text-align: left"&gt;
&lt;span id="xdx_907_err--PerformanceInformationIllustratesVariabilityOfReturns_dU_c20240430__20240430__dei--LegalEntityAxis__custom--S000003881Member_zHGn8gDIrjG6"&gt;The performance information below gives some indication of the risks associated with an investment in the fund by showing the fund&#x2019;s performance year to year and over time.&lt;/span&gt; Before April&#160;30, 2018, the fund was managed with a materially different investment strategy and may have achieved materially different performance results under its current investment strategy from that shown for periods before this date. The performance information does not reflect insurance-related charges or expenses. If it did, performance would be lower. &lt;span id="xdx_906_err--PerformancePastDoesNotIndicateFuture_dU_c20240430__20240430__dei--LegalEntityAxis__custom--S000003881Member_zGCsm3q7xNS3"&gt;Please remember that past performance is not necessarily an indication of future results.&lt;/span&gt;
&lt;/p&gt;

</rr:PerformanceNarrativeTextBlock>
    <rr:PerformanceInformationIllustratesVariabilityOfReturns
      contextRef="From2024-04-302024-04-30_custom_S000003881Member"
      id="Fact001626">The performance information below gives some indication of the risks associated with an investment in the fund by showing the fund&#x2019;s performance year to year and over time.</rr:PerformanceInformationIllustratesVariabilityOfReturns>
    <rr:PerformancePastDoesNotIndicateFuture
      contextRef="From2024-04-302024-04-30_custom_S000003881Member"
      id="Fact001627">Please remember that past performance is not necessarily an indication of future results.</rr:PerformancePastDoesNotIndicateFuture>
    <rr:BarChartHeading
      contextRef="From2024-04-302024-04-30_custom_S000003881Member"
      id="Fact001628">Annual total returns for class IA shares</rr:BarChartHeading>
    <rr:AnnualReturn2014
      contextRef="From2024-04-302024-04-30_custom_S000003881Member_custom_C000010857Member"
      decimals="INF"
      id="Fact001631"
      unitRef="Ratio">0.1108</rr:AnnualReturn2014>
    <rr:AnnualReturn2015
      contextRef="From2024-04-302024-04-30_custom_S000003881Member_custom_C000010857Member"
      decimals="INF"
      id="Fact001633"
      unitRef="Ratio">-0.0406</rr:AnnualReturn2015>
    <rr:AnnualReturn2016
      contextRef="From2024-04-302024-04-30_custom_S000003881Member_custom_C000010857Member"
      decimals="INF"
      id="Fact001635"
      unitRef="Ratio">0.1323</rr:AnnualReturn2016>
    <rr:AnnualReturn2017
      contextRef="From2024-04-302024-04-30_custom_S000003881Member_custom_C000010857Member"
      decimals="INF"
      id="Fact001637"
      unitRef="Ratio">0.1094</rr:AnnualReturn2017>
    <rr:AnnualReturn2018
      contextRef="From2024-04-302024-04-30_custom_S000003881Member_custom_C000010857Member"
      decimals="INF"
      id="Fact001639"
      unitRef="Ratio">-0.0464</rr:AnnualReturn2018>
    <rr:AnnualReturn2019
      contextRef="From2024-04-302024-04-30_custom_S000003881Member_custom_C000010857Member"
      decimals="INF"
      id="Fact001641"
      unitRef="Ratio">0.3032</rr:AnnualReturn2019>
    <rr:AnnualReturn2020
      contextRef="From2024-04-302024-04-30_custom_S000003881Member_custom_C000010857Member"
      decimals="INF"
      id="Fact001643"
      unitRef="Ratio">0.5299</rr:AnnualReturn2020>
    <rr:AnnualReturn2021
      contextRef="From2024-04-302024-04-30_custom_S000003881Member_custom_C000010857Member"
      decimals="INF"
      id="Fact001645"
      unitRef="Ratio">0.0633</rr:AnnualReturn2021>
    <rr:AnnualReturn2022
      contextRef="From2024-04-302024-04-30_custom_S000003881Member_custom_C000010857Member"
      decimals="INF"
      id="Fact001647"
      unitRef="Ratio">-0.3385</rr:AnnualReturn2022>
    <rr:AnnualReturn2023
      contextRef="From2024-04-302024-04-30_custom_S000003881Member_custom_C000010857Member"
      decimals="INF"
      id="Fact001649"
      unitRef="Ratio">0.2883</rr:AnnualReturn2023>
    <rr:YearToDateReturnLabel
      contextRef="From2024-04-302024-04-30_custom_S000003881Member"
      id="Fact001650">Year-to-date performance through</rr:YearToDateReturnLabel>
    <rr:BarChartYearToDateReturnDate
      contextRef="From2024-04-302024-04-30_custom_S000003881Member"
      id="Fact001651">2024-03-31</rr:BarChartYearToDateReturnDate>
    <rr:BarChartYearToDateReturn
      contextRef="From2024-04-302024-04-30_custom_S000003881Member"
      decimals="INF"
      id="Fact001652"
      unitRef="Ratio">0.1156</rr:BarChartYearToDateReturn>
    <rr:HighestQuarterlyReturnLabel
      contextRef="From2024-04-302024-04-30_custom_S000003881Member"
      id="Fact001653">Best calendar quarter</rr:HighestQuarterlyReturnLabel>
    <rr:BarChartHighestQuarterlyReturnDate
      contextRef="From2024-04-302024-04-30_custom_S000003881Member"
      id="Fact001654">2020-06-30</rr:BarChartHighestQuarterlyReturnDate>
    <rr:BarChartHighestQuarterlyReturn
      contextRef="From2024-04-302024-04-30_custom_S000003881Member"
      decimals="INF"
      id="Fact001655"
      unitRef="Ratio">0.3372</rr:BarChartHighestQuarterlyReturn>
    <rr:LowestQuarterlyReturnLabel
      contextRef="From2024-04-302024-04-30_custom_S000003881Member"
      id="Fact001656">Worst calendar quarter</rr:LowestQuarterlyReturnLabel>
    <rr:BarChartLowestQuarterlyReturnDate
      contextRef="From2024-04-302024-04-30_custom_S000003881Member"
      id="Fact001657">2022-06-30</rr:BarChartLowestQuarterlyReturnDate>
    <rr:BarChartLowestQuarterlyReturn
      contextRef="From2024-04-302024-04-30_custom_S000003881Member"
      decimals="INF"
      id="Fact001658"
      unitRef="Ratio">-0.2147</rr:BarChartLowestQuarterlyReturn>
    <rr:PerformanceTableHeading
      contextRef="From2024-04-302024-04-30_custom_S000003881Member"
      id="Fact001659">
Average annual total returns


(for
periods ended 12/31/23)</rr:PerformanceTableHeading>
    <rr:AverageAnnualReturnYear01
      contextRef="From2024-04-302024-04-30_custom_S000003881Member_custom_C000010857Member"
      decimals="INF"
      id="Fact001661"
      unitRef="Ratio">0.2883</rr:AverageAnnualReturnYear01>
    <rr:AverageAnnualReturnYear05
      contextRef="From2024-04-302024-04-30_custom_S000003881Member_custom_C000010857Member"
      decimals="INF"
      id="Fact001662"
      unitRef="Ratio">0.1256</rr:AverageAnnualReturnYear05>
    <rr:AverageAnnualReturnYear10
      contextRef="From2024-04-302024-04-30_custom_S000003881Member_custom_C000010857Member"
      decimals="INF"
      id="Fact001663"
      unitRef="Ratio">0.0872</rr:AverageAnnualReturnYear10>
    <rr:AverageAnnualReturnYear01
      contextRef="From2024-04-302024-04-30_custom_S000003881Member_custom_C000010858Member"
      decimals="INF"
      id="Fact001664"
      unitRef="Ratio">0.2852</rr:AverageAnnualReturnYear01>
    <rr:AverageAnnualReturnYear05
      contextRef="From2024-04-302024-04-30_custom_S000003881Member_custom_C000010858Member"
      decimals="INF"
      id="Fact001665"
      unitRef="Ratio">0.1228</rr:AverageAnnualReturnYear05>
    <rr:AverageAnnualReturnYear10
      contextRef="From2024-04-302024-04-30_custom_S000003881Member_custom_C000010858Member"
      decimals="INF"
      id="Fact001666"
      unitRef="Ratio">0.0844</rr:AverageAnnualReturnYear10>
    <rr:AverageAnnualReturnYear01
      contextRef="From2024-04-302024-04-30_custom_S000003881Member_custom_RussellMidcapGrowthIndexMember"
      decimals="INF"
      id="Fact001667"
      unitRef="Ratio">0.2587</rr:AverageAnnualReturnYear01>
    <rr:AverageAnnualReturnYear05
      contextRef="From2024-04-302024-04-30_custom_S000003881Member_custom_RussellMidcapGrowthIndexMember"
      decimals="INF"
      id="Fact001668"
      unitRef="Ratio">0.1381</rr:AverageAnnualReturnYear05>
    <rr:AverageAnnualReturnYear10
      contextRef="From2024-04-302024-04-30_custom_S000003881Member_custom_RussellMidcapGrowthIndexMember"
      decimals="INF"
      id="Fact001669"
      unitRef="Ratio">0.1057</rr:AverageAnnualReturnYear10>
    <rr:AverageAnnualReturnYear01
      contextRef="From2024-04-302024-04-30_custom_S000003881Member_custom_PVTSustainableFutureLBMember"
      decimals="INF"
      id="Fact001670"
      unitRef="Ratio">0.2587</rr:AverageAnnualReturnYear01>
    <rr:AverageAnnualReturnYear05
      contextRef="From2024-04-302024-04-30_custom_S000003881Member_custom_PVTSustainableFutureLBMember"
      decimals="INF"
      id="Fact001671"
      unitRef="Ratio">0.1381</rr:AverageAnnualReturnYear05>
    <rr:AverageAnnualReturnYear10
      contextRef="From2024-04-302024-04-30_custom_S000003881Member_custom_PVTSustainableFutureLBMember"
      decimals="INF"
      id="Fact001672"
      unitRef="Ratio">0.0979</rr:AverageAnnualReturnYear10>
    <rr:PerformanceTableClosingTextBlock
      contextRef="From2024-04-302024-04-30_custom_S000003881Member"
      id="Fact001673">&lt;div id="xdx_A82_err--PerformanceTableClosingTextBlock_zBTTpbDDr8E"&gt;&lt;/div&gt;
&lt;table style="font: 300 9pt/1.5 Arial, Helvetica, Sans-Serif; margin-left: 10px; width: 90%"&gt;
&lt;tr style="vertical-align: top"&gt;
&lt;td style="width: 25px; text-align: right"&gt;&lt;/td&gt;
&lt;td&gt;&lt;span style="-sec-ix-redline: true"&gt;Frank Russell Company is the source and owner of the trademarks, service marks and copyrights related to the Russell Indexes.
Russell&#xae; is a trademark of Frank Russell Company.&lt;/span&gt;&lt;/td&gt;

&lt;/tr&gt;
&lt;/table&gt;

&lt;table style="font: 300 9pt/1.5 Arial, Helvetica, Sans-Serif; margin-left: 10px; width: 90%"&gt;
&lt;tr style="vertical-align: top"&gt;
&lt;td style="width: 25px; text-align: right"&gt;


&lt;/td&gt;
&lt;td&gt;
The Putnam VT Sustainable Future Linked Benchmark represents the performance of the Russell 3000&#xae; Value Index through April 29, 2018, and the performance of the Russell Midcap&#xae; Growth Index thereafter.

&lt;/td&gt;

&lt;/tr&gt;
&lt;/table&gt;

</rr:PerformanceTableClosingTextBlock>
    <rr:RiskReturnHeading
      contextRef="From2024-04-302024-04-30_custom_S000003884Member"
      id="Fact001675">Fund summary</rr:RiskReturnHeading>
    <rr:ObjectiveHeading
      contextRef="From2024-04-302024-04-30_custom_S000003884Member"
      id="Fact001676">Goal</rr:ObjectiveHeading>
    <rr:ObjectivePrimaryTextBlock
      contextRef="From2024-04-302024-04-30_custom_S000003884Member"
      id="Fact001677">&lt;p id="xdx_A83_err--ObjectivePrimaryTextBlock_zemXmjmrA7I2" style="font: 10pt/1.5 Arial, Helvetica, Sans-Serif; margin: 0px 42px 9px; color: #000000; font-weight: 300; text-align: left"&gt;
Putnam VT Sustainable Leaders Fund seeks long-term capital&#160;appreciation.
&lt;/p&gt;

</rr:ObjectivePrimaryTextBlock>
    <rr:ExpenseHeading
      contextRef="From2024-04-302024-04-30_custom_S000003884Member"
      id="Fact001678">Fees and expenses</rr:ExpenseHeading>
    <rr:ExpenseNarrativeTextBlock
      contextRef="From2024-04-302024-04-30_custom_S000003884Member"
      id="Fact001679">&lt;p id="xdx_A8F_err--ExpenseNarrativeTextBlock_z2Rnues6Z7eg" style="font: 10pt/1.5 Arial, Helvetica, Sans-Serif; margin: 0px 42px 9px; color: #000000; font-weight: 300; text-align: left"&gt;
The following table describes the fees and expenses you may pay if you buy, hold and sell shares of the fund. You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in the tables and examples below. The fees and expenses information does not reflect insurance-related charges or expenses borne by contract holders indirectly investing in the fund. If it did, expenses would be higher.
&lt;/p&gt;

</rr:ExpenseNarrativeTextBlock>
    <rr:OperatingExpensesCaption
      contextRef="From2024-04-302024-04-30_custom_S000003884Member"
      id="Fact001680">
Annual fund operating expenses



(expenses you pay each year as a percentage of the value of your investment)
</rr:OperatingExpensesCaption>
    <rr:ManagementFeesOverAssets
      contextRef="From2024-04-302024-04-30_custom_S000003884Member_custom_C000010863Member"
      decimals="INF"
      id="Fact001682"
      unitRef="Ratio">0.0055</rr:ManagementFeesOverAssets>
    <rr:DistributionAndService12b1FeesOverAssets
      contextRef="From2024-04-302024-04-30_custom_S000003884Member_custom_C000010863Member"
      decimals="INF"
      id="Fact001683"
      unitRef="Ratio">0</rr:DistributionAndService12b1FeesOverAssets>
    <rr:OtherExpensesOverAssets
      contextRef="From2024-04-302024-04-30_custom_S000003884Member_custom_C000010863Member"
      decimals="INF"
      id="Fact001684"
      unitRef="Ratio">0.0010</rr:OtherExpensesOverAssets>
    <rr:ExpensesOverAssets
      contextRef="From2024-04-302024-04-30_custom_S000003884Member_custom_C000010863Member"
      decimals="INF"
      id="Fact001685"
      unitRef="Ratio">0.0065</rr:ExpensesOverAssets>
    <rr:ManagementFeesOverAssets
      contextRef="From2024-04-302024-04-30_custom_S000003884Member_custom_C000010864Member"
      decimals="INF"
      id="Fact001686"
      unitRef="Ratio">0.0055</rr:ManagementFeesOverAssets>
    <rr:DistributionAndService12b1FeesOverAssets
      contextRef="From2024-04-302024-04-30_custom_S000003884Member_custom_C000010864Member"
      decimals="INF"
      id="Fact001687"
      unitRef="Ratio">0.0025</rr:DistributionAndService12b1FeesOverAssets>
    <rr:OtherExpensesOverAssets
      contextRef="From2024-04-302024-04-30_custom_S000003884Member_custom_C000010864Member"
      decimals="INF"
      id="Fact001688"
      unitRef="Ratio">0.0010</rr:OtherExpensesOverAssets>
    <rr:ExpensesOverAssets
      contextRef="From2024-04-302024-04-30_custom_S000003884Member_custom_C000010864Member"
      decimals="INF"
      id="Fact001689"
      unitRef="Ratio">0.0090</rr:ExpensesOverAssets>
    <rr:ExpenseExampleHeading
      contextRef="From2024-04-302024-04-30_custom_S000003884Member"
      id="Fact001690">Example</rr:ExpenseExampleHeading>
    <rr:ExpenseExampleNarrativeTextBlock
      contextRef="From2024-04-302024-04-30_custom_S000003884Member"
      id="Fact001691">&lt;p id="xdx_A88_err--ExpenseExampleNarrativeTextBlock_zbmU0lYcxHW5" style="font: 10pt/1.5 Arial, Helvetica, Sans-Serif; margin: 0px 42px 9px; color: #000000; font-weight: 300; text-align: left"&gt;
The following hypothetical example is intended to help you compare the cost of investing in the fund with the cost of investing in other funds. The example does not reflect insurance-related charges or expenses. If it did, expenses would be higher. It assumes that you invest $10,000 in the fund for the time periods indicated and then redeem or hold all your shares at the end of those periods. It assumes a 5% return on your investment each year and that the fund&#x2019;s operating expenses remain the same. Your actual costs may be higher or lower.
&lt;/p&gt;

</rr:ExpenseExampleNarrativeTextBlock>
    <rr:ExpenseExampleYear01
      contextRef="From2024-04-302024-04-30_custom_S000003884Member_custom_C000010863Member"
      decimals="0"
      id="Fact001693"
      unitRef="USD">66</rr:ExpenseExampleYear01>
    <rr:ExpenseExampleYear03
      contextRef="From2024-04-302024-04-30_custom_S000003884Member_custom_C000010863Member"
      decimals="0"
      id="Fact001694"
      unitRef="USD">208</rr:ExpenseExampleYear03>
    <rr:ExpenseExampleYear05
      contextRef="From2024-04-302024-04-30_custom_S000003884Member_custom_C000010863Member"
      decimals="0"
      id="Fact001695"
      unitRef="USD">362</rr:ExpenseExampleYear05>
    <rr:ExpenseExampleYear10
      contextRef="From2024-04-302024-04-30_custom_S000003884Member_custom_C000010863Member"
      decimals="0"
      id="Fact001696"
      unitRef="USD">810</rr:ExpenseExampleYear10>
    <rr:ExpenseExampleYear01
      contextRef="From2024-04-302024-04-30_custom_S000003884Member_custom_C000010864Member"
      decimals="0"
      id="Fact001697"
      unitRef="USD">92</rr:ExpenseExampleYear01>
    <rr:ExpenseExampleYear03
      contextRef="From2024-04-302024-04-30_custom_S000003884Member_custom_C000010864Member"
      decimals="0"
      id="Fact001698"
      unitRef="USD">287</rr:ExpenseExampleYear03>
    <rr:ExpenseExampleYear05
      contextRef="From2024-04-302024-04-30_custom_S000003884Member_custom_C000010864Member"
      decimals="0"
      id="Fact001699"
      unitRef="USD">498</rr:ExpenseExampleYear05>
    <rr:ExpenseExampleYear10
      contextRef="From2024-04-302024-04-30_custom_S000003884Member_custom_C000010864Member"
      decimals="0"
      id="Fact001700"
      unitRef="USD">1108</rr:ExpenseExampleYear10>
    <rr:PortfolioTurnoverHeading
      contextRef="From2024-04-302024-04-30_custom_S000003884Member"
      id="Fact001701">Portfolio turnover</rr:PortfolioTurnoverHeading>
    <rr:PortfolioTurnoverTextBlock
      contextRef="From2024-04-302024-04-30_custom_S000003884Member"
      id="Fact001702">&lt;p id="xdx_A8F_err--PortfolioTurnoverTextBlock_zGpIvpgujrQl" style="font: 10pt/1.5 Arial, Helvetica, Sans-Serif; margin: 0px 42px 9px; color: #000000; font-weight: 300; text-align: left"&gt;&lt;span style="-sec-ix-redline: true"&gt;The
fund pays transaction-related costs, such as commissions, when it buys and sells securities (or &#x201c;turns over&#x201d; its portfolio).
A higher turnover rate may indicate higher transaction costs. These costs, which are not reflected in annual fund operating expenses
or the above example, affect fund performance. The fund&#x2019;s turnover rate in the most recent fiscal year was&lt;span id="xdx_907_err--PortfolioTurnoverRate_dU_c20240430__20240430__dei--LegalEntityAxis__custom--S000003884Member_z35dIRoHIhuh"&gt; 21%&lt;/span&gt;.&lt;/span&gt;&lt;/p&gt;

</rr:PortfolioTurnoverTextBlock>
    <rr:PortfolioTurnoverRate
      contextRef="From2024-04-302024-04-30_custom_S000003884Member"
      decimals="INF"
      id="Fact001703"
      unitRef="Ratio">0.21</rr:PortfolioTurnoverRate>
    <rr:StrategyHeading
      contextRef="From2024-04-302024-04-30_custom_S000003884Member"
      id="Fact001704">Investments, risks, and performance</rr:StrategyHeading>
    <rr:StrategyNarrativeTextBlock
      contextRef="From2024-04-302024-04-30_custom_S000003884Member"
      id="Fact001705">&lt;p id="xdx_A87_err--StrategyNarrativeTextBlock_zUjgyq09BOH6" style="font: 600 10pt/1.5 Arial, Helvetica, Sans-Serif; margin: 15px 42px 0px; color: #000000"&gt;
&lt;b&gt;Investments&lt;/b&gt;
&lt;/p&gt;

&lt;p style="font: 10pt/1.5 Arial, Helvetica, Sans-Serif; margin: 0px 42px 9px; color: #000000; font-weight: 300; text-align: left"&gt;&lt;span style="-sec-ix-redline: true"&gt;We
invest mainly in common stocks of U.S. companies of any size, with a focus on companies that we believe exhibit a commitment to financially
material sustainable business practices. We may also invest in non-U.S. companies. In evaluating investments for the fund, we view &#x201c;financially
material sustainable business practices&#x201d; as business practices that we believe are reasonably likely to impact the financial condition
or operating performance of a company and that relate to environmental, social, or corporate governance (&#x201c;ESG&#x201d;) issues. We
identify relevant ESG issues on a sector-specific basis using an internally developed materiality map, which is informed by the industry-specific
financial materiality framework of the Sustainability Accounting Standards Board (&#x201c;SASB,&#x201d; now incorporated in the International
Financial Reporting Standards Foundation). As part of this analysis, we may utilize metrics and information such as emissions data, carbon
intensity, sources of energy used for operations, water use and re-use, water generation, waste diversion from landfill, employee safety
and diversity data, supplier audits, product safety, board composition, and incentive compensation structures. Stocks of companies that
exhibit a commitment to financially material sustainable business practices are typically, but not always, considered to be growth stocks.
Growth stocks are stocks of companies whose revenues, earnings, or cash flows are expected to grow faster than those of similar firms,
and whose business growth and other characteristics may lead to an increase in stock price. We may consider, among other factors, a company&#x2019;s
sustainable business practices (as described above), valuation, financial strength, growth potential, competitive position in its industry,
projected future earnings, cash flows and dividends when deciding whether to buy or sell investments.&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt/1.5 Arial, Helvetica, Sans-Serif; margin: 0px 42px 9px; color: #000000; font-weight: 300; text-align: left"&gt;Under
normal circumstances, the fund invests at least 80% of the value of its net&#160;assets in securities that meet our sustainability criteria.
These criteria are based on a proprietary materiality map that is informed by the industry-specific financial materiality framework of
SASB. In applying these criteria, we will assign each company a proprietary ESG rating ranging from 1 to 4 (1 indicating the highest
(best) ESG rating and 4 indicating the lowest (worst) ESG rating). In order to meet our sustainability criteria for purposes of this
investment policy, a company must be rated 2 or 1 by us. This policy is non-fundamental and may be changed only after 60 days&#x2019;
notice to shareholders. In selecting each investment, we focus on companies that have a demonstrated commitment to sustainable business
practices in areas that are relevant and material to their long-term financial returns and risk profiles. We believe that companies that
have exhibited such a commitment also often demonstrate potential for strong financial growth. This commitment may be reflected through
ESG policies, practices, or outcomes. The fund&#x2019;s approach to sustainable investing incorporates fundamental research together with
consideration of ESG factors. Environmental factors include, for example, a company&#x2019;s carbon intensity and use of resources like
water or minerals. Sustainability measures in this area might include plans to reduce waste, increase recycling, raise the proportion
of energy supply from renewable sources, or improve product design to be less resource intensive. Social factors include, for example,
labor practices and supply chain management. Sustainability measures in this area might include programs to improve employee well-being,
commitment to workplace equality and diversity, or improved stewardship of&lt;/p&gt;



&lt;p&gt;
&lt;br/&gt;
&lt;br/&gt;
&lt;/p&gt;

&lt;div style="border-top: Black 1pt solid; margin: 18pt auto; font-size: 1pt"&gt;&#160;&lt;/div&gt;

&lt;p&gt;&lt;br/&gt;
&lt;br/&gt;
&lt;/p&gt;

&lt;p style="font: 10pt/1.5 Arial, Helvetica, Sans-Serif; margin: 0px 42px 9px; color: #000000; font-weight: 300; text-align: left"&gt;supplier
relationships and working conditions. Corporate governance factors include, for example, board composition and executive compensation.
Sustainability measures in this area might include improvements in board independence or diversity, or alignment of management incentives
with the company&#x2019;s strategic sustainability objectives. Our integrated approach combines analysis of the growing body of ESG data
and deep fundamental analysis and looks for companies that demonstrate leadership, beyond compliance, on relevant sustainability issues.
The characteristics that we may use when considering sustainability leadership include:&lt;/p&gt;

&lt;p style="font: 10pt/1.5 Arial, Helvetica, Sans-Serif; margin: 0px 42px 9px; color: #000000; font-weight: 300; text-align: left"&gt;&lt;span style="-sec-ix-redline: true"&gt;(1)
Material. Focused on strategic, business-relevant issues.&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt/1.5 Arial, Helvetica, Sans-Serif; margin: 0px 42px 9px; color: #000000; font-weight: 300; text-align: left"&gt;&lt;span style="-sec-ix-redline: true"&gt;(2)
Proactive. Actions that go beyond basic requirements to create potential business benefit.&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt/1.5 Arial, Helvetica, Sans-Serif; margin: 0px 42px 9px; color: #000000; font-weight: 300; text-align: left"&gt;&lt;span style="-sec-ix-redline: true"&gt;(3)
Transparent. Reporting that is relevant, timely, and candid.&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt/1.5 Arial, Helvetica, Sans-Serif; margin: 0px 42px 9px; color: #000000; font-weight: 300; text-align: left"&gt;&lt;span style="-sec-ix-redline: true"&gt;(4)
Effective. Creating benefits both within the firm and beyond its corporate borders.&lt;/span&gt;&lt;/p&gt;

</rr:StrategyNarrativeTextBlock>
    <rr:RiskHeading
      contextRef="From2024-04-302024-04-30_custom_S000003884Member"
      id="Fact001707">Risks</rr:RiskHeading>
    <rr:RiskTextBlock
      contextRef="From2024-04-302024-04-30_custom_S000003884Member"
      id="Fact001708">&lt;p id="xdx_A8A_err--RiskTextBlock_zuL8yUqaZK9g" style="font: 10pt/1.5 Arial, Helvetica, Sans-Serif; margin: 0px 42px 9px; color: #000000; font-weight: 300; text-align: left"&gt;
&lt;span id="xdx_902_err--RiskTextBlock_dU_c20240430__20240430__dei--LegalEntityAxis__custom--S000003884Member__rr--RiskAxis__rr--RiskLoseMoneyMember_zj3162XPAk78"&gt;It is important to understand that you can lose money by investing in the fund&lt;/span&gt;.
&lt;/p&gt;

&lt;p style="font: 10pt/1.5 Arial, Helvetica, Sans-Serif; margin: 0px 42px 9px; color: #000000; font-weight: 300; text-align: left"&gt;
The value of investments in the fund&#x2019;s portfolio may fall or fail to rise over extended periods of time for a variety of reasons, including general economic, political or financial market conditions, investor sentiment and market perceptions, government actions, geopolitical events or changes, outbreaks of infectious illnesses or other widespread public health issues, and factors related to a specific issuer, geography, industry or sector. These and other factors may lead to increased volatility and reduced liquidity in the fund&#x2019;s portfolio holdings, may negatively impact the fund&#x2019;s performance, and may exacerbate other risks to which the fund is subject. 
&lt;/p&gt;

&lt;p style="font: 10pt/1.5 Arial, Helvetica, Sans-Serif; margin: 0px 42px 9px; color: #000000; font-weight: 300; text-align: left"&gt;
The value of a company&#x2019;s stock may fall or fail to rise as a result of factors directly relating to that company, such as decisions made by its management or lower demand for the company&#x2019;s products or services. A stock&#x2019;s value may also fall because of factors affecting not just the company, but also other companies in the same industry or in a number of different industries, such as increases in production costs.
&lt;/p&gt;

&lt;p style="font: 10pt/1.5 Arial, Helvetica, Sans-Serif; margin: 0px 42px 9px; color: #000000; font-weight: 300; text-align: left"&gt;&lt;span style="-sec-ix-redline: true"&gt;Growth
stocks may be more susceptible to earnings disappointments, and the market may not favor growth-style investing. These risks are generally
greater for small and midsize companies. From time to time, the fund may invest a significant portion of its assets in companies in one
or more related industries or sectors, which would make the fund more vulnerable to adverse developments affecting those industries or
sectors.&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt/1.5 Arial, Helvetica, Sans-Serif; margin: 0px 42px 9px; color: #000000; font-weight: 300; text-align: left"&gt;
The value of international investments traded in foreign currencies may be adversely impacted by fluctuations in exchange rates. International investments, particularly investments in emerging markets, may carry risks associated with potentially less stable economies or governments (such as the risk of seizure by a foreign government, the imposition of currency or other restrictions, or high levels of inflation), and may be or become illiquid.
&lt;/p&gt;

&lt;p style="font: 10pt/1.5 Arial, Helvetica, Sans-Serif; margin: 0px 42px 9px; color: #000000; font-weight: 300; text-align: left"&gt;
Investing with a focus on companies that exhibit a commitment to sustainable practices may result in the fund investing in certain types of companies, industries or sectors that the market may not favor. In evaluating an investment opportunity, we may make investment decisions based on information and data that is incomplete or inaccurate. Sustainability and ESG metrics are not uniformly defined and applying such metrics involves subjective assessments. Sustainability and ESG scorings and assessments of issuers can vary across third-party data providers and may change over time. In /addition, a company&#x2019;s business practices, products or services may change over time. As a result of these possibilities, among others, the fund may temporarily hold securities that are inconsistent with the fund&#x2019;s sustainable investment criteria. Regulatory changes or interpretations regarding the definitions and/or use of ESG or other sustainability criteria could have a material adverse effect on the fund&#x2019;s ability to invest in accordance with its investment policies and/or achieve its investment objective, as well as the ability of certain classes of investors to invest in funds, such as the fund, whose strategies include ESG or other sustainability criteria.
&lt;/p&gt;

&lt;p style="font: 10pt/1.5 Arial, Helvetica, Sans-Serif; margin: 0px 42px 9px; color: #000000; font-weight: 300; text-align: left"&gt;
There is no guarantee that the investment techniques, analyses, or judgments that we apply in making investment decisions for the fund will produce the intended outcome or that the investments we select for the fund will perform as well as other securities that were not selected for the fund. We, or the fund&#x2019;s other service providers, may experience disruptions or operating errors that could negatively impact the fund.
&lt;/p&gt;

&lt;p style="font: 10pt/1.5 Arial, Helvetica, Sans-Serif; margin: 0px 42px 9px; color: #000000; font-weight: 300; text-align: left"&gt;
The fund may be an investment option for mutual funds that are managed by Franklin Resources, Inc. (Franklin Templeton) and its affiliates as &#x201c;funds of funds&#x201d; and other investors with substantial investments in the fund. Such shareholders may at times be considered to control the fund. Dispositions of a large number of shares by these shareholders may adversely affect the fund&#x2019;s liquidity and net&#160;assets. These redemptions may also force the fund to sell securities, which may increase the fund&#x2019;s brokerage costs.
&lt;/p&gt;

&lt;p style="font: 10pt/1.5 Arial, Helvetica, Sans-Serif; margin: 0px 42px 9px; color: #000000; font-weight: 300; text-align: left"&gt;
The fund may not achieve its goal, and it is not intended to be a complete investment program. &lt;span id="xdx_90F_err--RiskTextBlock_dU_c20240430__20240430__dei--LegalEntityAxis__custom--S000003884Member__rr--RiskAxis__rr--RiskNotInsuredDepositoryInstitutionMember_zIaqAxFduVja"&gt;An investment in the fund is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency.&lt;/span&gt;
&lt;/p&gt;

</rr:RiskTextBlock>
    <rr:RiskTextBlock
      contextRef="From2024-04-302024-04-30_custom_S000003884Member_rr_RiskLoseMoneyMember"
      id="Fact001709">It is important to understand that you can lose money by investing in the fund</rr:RiskTextBlock>
    <rr:RiskTextBlock
      contextRef="From2024-04-302024-04-30_custom_S000003884Member_rr_RiskNotInsuredDepositoryInstitutionMember"
      id="Fact001710">An investment in the fund is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency.</rr:RiskTextBlock>
    <rr:BarChartAndPerformanceTableHeading
      contextRef="From2024-04-302024-04-30_custom_S000003884Member"
      id="Fact001711">Performance</rr:BarChartAndPerformanceTableHeading>
    <rr:PerformanceNarrativeTextBlock
      contextRef="From2024-04-302024-04-30_custom_S000003884Member"
      id="Fact001712">&lt;p id="xdx_A80_err--PerformanceNarrativeTextBlock_zxXjYNd7ws8f" style="font: 10pt/1.5 Arial, Helvetica, Sans-Serif; margin: 0px 42px 9px; color: #000000; font-weight: 300; text-align: left"&gt;
&lt;span id="xdx_902_err--PerformanceInformationIllustratesVariabilityOfReturns_dU_c20240430__20240430__dei--LegalEntityAxis__custom--S000003884Member_zNkncspnFxu1"&gt;The performance information below gives some indication of the risks associated with an investment in the fund by showing the fund&#x2019;s performance year to year and over time.&lt;/span&gt; Before April&#160;30, 2018, the fund was managed with a materially different investment strategy and may have achieved materially different performance results under its current investment strategy from that shown for periods before this date. The performance information does not 
&lt;/p&gt;



&lt;p&gt;
&lt;br/&gt;
&lt;br/&gt;
&lt;/p&gt;

&lt;div style="border-top: Black 1pt solid; margin: 18pt auto; font-size: 1pt"&gt;&#160;&lt;/div&gt;

&lt;p&gt;&lt;br/&gt;
&lt;br/&gt;
&lt;/p&gt;

&lt;p style="font: 10pt/1.5 Arial, Helvetica, Sans-Serif; margin: 0px 42px 9px; color: #000000; font-weight: 300; text-align: left"&gt;
reflect insurance-related charges or expenses. If it did, performance would be lower. &lt;span id="xdx_90E_err--PerformancePastDoesNotIndicateFuture_dU_c20240430__20240430__dei--LegalEntityAxis__custom--S000003884Member_zI83M3Uu6OLa"&gt;Please remember that past performance is not necessarily an indication of future results.&lt;/span&gt;
&lt;/p&gt;

</rr:PerformanceNarrativeTextBlock>
    <rr:PerformanceInformationIllustratesVariabilityOfReturns
      contextRef="From2024-04-302024-04-30_custom_S000003884Member"
      id="Fact001713">The performance information below gives some indication of the risks associated with an investment in the fund by showing the fund&#x2019;s performance year to year and over time.</rr:PerformanceInformationIllustratesVariabilityOfReturns>
    <rr:PerformancePastDoesNotIndicateFuture
      contextRef="From2024-04-302024-04-30_custom_S000003884Member"
      id="Fact001715">Please remember that past performance is not necessarily an indication of future results.</rr:PerformancePastDoesNotIndicateFuture>
    <rr:BarChartHeading
      contextRef="From2024-04-302024-04-30_custom_S000003884Member"
      id="Fact001716">Annual total returns for class IA shares</rr:BarChartHeading>
    <rr:AnnualReturn2014
      contextRef="From2024-04-302024-04-30_custom_S000003884Member_custom_C000010863Member"
      decimals="INF"
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&lt;table style="font: 300 9pt/1.5 Arial, Helvetica, Sans-Serif; margin-left: 10px; width: 90%"&gt;
&lt;tr style="vertical-align: top"&gt;
&lt;td style="width: 25px; text-align: right"&gt;&lt;/td&gt;
&lt;td&gt;&lt;span style="-sec-ix-redline: true"&gt;The Putnam VT Sustainable Leaders Linked Benchmark represents the performance of the Russell 3000&#xae; Growth Index through August
31, 2019, and the performance of the S&amp;amp;P 500&#xae; Index thereafter.&lt;/span&gt;&lt;/td&gt;

&lt;/tr&gt;
&lt;/table&gt;

&lt;table style="font: 300 9pt/1.5 Arial, Helvetica, Sans-Serif; margin-left: 10px; width: 90%"&gt;
&lt;tr style="vertical-align: top"&gt;
&lt;td style="width: 25px; text-align: right"&gt;&lt;/td&gt;
&lt;td&gt;&lt;span style="-sec-ix-redline: true"&gt;Frank Russell Company is the source and owner of the trademarks, service marks and copyrights related to the Russell Indexes.
Russell&#xae; is a trademark of Frank Russell Company.&lt;/span&gt;&lt;/td&gt;

&lt;/tr&gt;
&lt;/table&gt;

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