v3.24.4
Label Element Value
Prospectus [Line Items] rr_ProspectusLineItems  
Document Type dei_DocumentType 485BPOS
Document Period End Date dei_DocumentPeriodEndDate Dec. 31, 2023
Entity Registrant Name dei_EntityRegistrantName Putnam Asset Allocation Funds
Entity Central Index Key dei_EntityCentralIndexKey 0000914209
Entity Inv Company Type dei_EntityInvCompanyType N-1A
Amendment Flag dei_AmendmentFlag false
Putnam Multi-Asset Income Fund  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk/Return [Heading] rr_RiskReturnHeading Fund summary
Objective [Heading] rr_ObjectiveHeading Goal
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock

Putnam Multi-Asset Income Fund seeks total return consistent with conservation of capital. Within the fund’s total return orientation, the fund seeks to provide current income, along with long-term capital appreciation.

Expense [Heading] rr_ExpenseHeading Fees and expenses
Expense Narrative [Text Block] rr_ExpenseNarrativeTextBlock

The following tables describe 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. You may qualify for sales charge discounts if you and your family invest, or agree to invest in the future, at least $50,000 in Putnam funds. More information about these and other discounts is available from your financial professional and in How do I buy fund shares? beginning on page 21 of the fund’s prospectus, in the Appendix to the fund’s prospectus, and in How to buy shares beginning on page II-1 of the fund’s statement of additional information (“SAI”).

Shareholder Fees Caption [Text] rr_ShareholderFeesCaption Shareholder fees (fees paid directly from your investment)
Operating Expenses Caption [Text] rr_OperatingExpensesCaption Annual fund operating expenses (expenses you pay each year as a percentage of the value of your investment)
Fee Waiver or Reimbursement over Assets, Date of Termination rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination December 30, 2025
Portfolio Turnover [Heading] rr_PortfolioTurnoverHeading Portfolio turnover
Portfolio Turnover [Text Block] rr_PortfolioTurnoverTextBlock

The fund pays transaction-related costs, such as commissions, when it buys and sells securities (or “turns over” its portfolio). A higher turnover rate may indicate higher transaction costs and may result in higher taxes when the fund’s shares are held in a taxable account. These costs, which are not reflected in annual fund operating expenses or the above example, affect fund performance. The fund’s turnover rate in the most recent fiscal year was 143%.

Portfolio Turnover, Rate rr_PortfolioTurnoverRate 143.00%
Expense Breakpoint Discounts [Text] rr_ExpenseBreakpointDiscounts You may qualify for sales charge discounts if you and your family invest, or agree to invest in the future, at least $50,000 in Putnam funds.
Expense Breakpoint, Minimum Investment Required [Amount] rr_ExpenseBreakpointMinimumInvestmentRequiredAmount $ 50,000
Expense Example [Heading] rr_ExpenseExampleHeading Example
Expense Example Narrative [Text Block] rr_ExpenseExampleNarrativeTextBlock

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. It assumes that you invest $10,000 in the fund for the time periods indicated and then, except as indicated, redeem all your shares at the end of those periods. It assumes a 5% return on your investment each year and that the fund’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.

Strategy [Heading] rr_StrategyHeading Investments, risks, and performance
Strategy Narrative [Text Block] rr_StrategyNarrativeTextBlock

Investments

We invest mainly in fixed-income investments, including U.S. and foreign (including emerging market) government obligations, corporate obligations and securitized debt instruments (such as mortgage-backed investments) of any credit quality. We



 



also invest, to a lesser extent, in equity securities (growth or value stocks or both) of U.S. and foreign (including emerging market) companies of any size.

The fund has a strategic, or typical, allocation between equity and fixed income investments. Using qualitative analysis and quantitative models and techniques, we adjust portfolio allocations from time to time within a certain range to try to optimize the fund’s performance consistent with its goal. The strategic allocation and the range of allowable allocation for the fund is shown below:

Class Strategic Allocation Range
Equity 27% 5-50%
Fixed Income 73% 50-95%

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. We may also 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 typically use derivatives to a significant extent, such as futures, options, certain foreign currency transactions, warrants and interest rate and total return swap contracts, for both hedging and non-hedging purposes. We may also use derivatives and debt instruments with terms determined by reference to a particular commodity or to all or portions of a commodities index.

Risk [Heading] rr_RiskHeading Risks
Risk [Text Block] rr_RiskTextBlock

It is important to understand that you can lose money by investing in the fund.

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.

The value of investments in the fund’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, and factors related to a specific issuer, asset class, 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’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. In addition, small and midsize companies, at times, may not perform as well as stocks of larger companies or the stock market in general, and may be out of favor with investors for varying periods of time.



 



Bond investments are subject to interest rate risk, which is the risk that the value of the fund’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 issuers of the bond may default on payment of interest or principal. 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. Bond investments may be more susceptible to downgrades or defaults during economic downturns or other periods of economic stress. 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.

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.

Our use of derivatives may increase the risk of investing in the fund by increasing investment exposure (which may be considered leverage and magnify or otherwise increase investment losses to the fund) 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 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’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).

The fund expects to engage in frequent trading. Funds with high turnover may be more likely to realize capital gains that must be distributed to shareholders as taxable income and may incur higher transaction costs than funds with relatively lower turnover, which may detract from performance.

Certain accounts or affiliates of the Investment Manager, including other funds advised by the Investment Manager or third parties, may from time to time own (beneficially or of record) or control a substantial amount of the fund’s shares, including through seed capital arrangements. 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 assets. These redemptions may also force the fund to sell securities, which may increase the fund’s brokerage costs.

The fund may be an investment option for mutual funds that are managed by Franklin Resources, Inc. (“Franklin Templeton”) and its affiliates as “funds of funds.” Additionally, other investors from time to time may make 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 assets. These redemptions may also force the fund to sell securities, which may increase the fund’s brokerage costs.

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.

The fund may not achieve its goal, and it is not intended to be a complete investment program. An investment in the fund is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency.

Bar Chart and Performance Table [Heading] rr_BarChartAndPerformanceTableHeading Performance
Performance Narrative [Text Block] rr_PerformanceNarrativeTextBlock

The performance information below gives some indication of the risks associated with an investment in the fund by showing the fund’s performance year to year and over time. The bar chart does not reflect the impact of sales charges. If it did, performance would be lower. Please remember that past performance is not necessarily an indication of future results. Monthly performance figures for the fund are available at www.franklintempleton.com.

Performance Information Illustrates Variability of Returns [Text] rr_PerformanceInformationIllustratesVariabilityOfReturns The performance information below gives some indication of the risks associated with an investment in the fund by showing the fund’s performance year to year and over time.
Performance Availability Website Address [Text] rr_PerformanceAvailabilityWebSiteAddress www.franklintempleton.com
Performance Past Does Not Indicate Future [Text] rr_PerformancePastDoesNotIndicateFuture Please remember that past performance is not necessarily an indication of future results.
Bar Chart [Heading] rr_BarChartHeading Annual total returns for class P shares before sales charges
Bar Chart Does Not Reflect Sales Loads [Text] rr_BarChartDoesNotReflectSalesLoads The bar chart does not reflect the impact of sales charges.
Year to Date Return, Label rr_YearToDateReturnLabel Year-to-date performance through
Bar Chart, Year to Date Return, Date rr_BarChartYearToDateReturnDate Sep. 30, 2024
Bar Chart, Year to Date Return rr_BarChartYearToDateReturn 10.95%
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel Best calendar quarter
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Dec. 31, 2023
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 8.37%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel Worst calendar quarter
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Jun. 30, 2022
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (8.14%)
Performance Table Heading rr_PerformanceTableHeading Average annual total returns after sales charges (for periods ended 12/31/23)
Performance Table Uses Highest Federal Rate rr_PerformanceTableUsesHighestFederalRate After-tax returns reflect the historical highest individual federal marginal income tax rates and do not reflect state and local taxes
Performance Table Not Relevant to Tax Deferred rr_PerformanceTableNotRelevantToTaxDeferred Actual after-tax returns depend on an investor’s tax situation and may differ from those shown.
Performance Table One Class of after Tax Shown [Text] rr_PerformanceTableOneClassOfAfterTaxShown After-tax returns are shown for class A shares only and will vary for other classes.
Performance Table Closing [Text Block] rr_PerformanceTableClosingTextBlock
After-tax returns reflect the historical highest individual federal marginal income tax rates and do not reflect state and local taxes. Actual after-tax returns depend on an investor’s tax situation and may differ from those shown. After-tax returns are shown for class A shares only and will vary for other classes. These after-tax returns do not apply if you hold your fund shares through a 401(k) plan, an IRA, or another tax-advantaged arrangement.
The Bloomberg U.S. Aggregate Index is an unmanaged index of U.S. investment-grade fixed income securities.
All Bloomberg indices are provided by Bloomberg Index Services Limited.



 



BLOOMBERG® is a trademark and service mark of Bloomberg Finance L.P. and its affiliates (collectively “Bloomberg”). Bloomberg or Bloomberg’s licensors, own all proprietary rights in the Bloomberg Indices. Neither Bloomberg nor Bloomberg’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.
All MSCI indices are provided by MSCI. 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.
Putnam Multi-Asset Income Fund | Bloomberg U.S. Aggregate Index (no deduction for fees, expenses or taxes)  
Prospectus [Line Items] rr_ProspectusLineItems  
1 Year rr_AverageAnnualReturnYear01 5.53% [1]
Since Inception rr_AverageAnnualReturnSinceInception (0.72%) [1]
Inception Date rr_AverageAnnualReturnInceptionDate Dec. 31, 2019
Putnam Multi-Asset Income Fund | Putnam Multi-Asset Income Blended Benchmark (no deduction for fees, expenses or taxes)  
Prospectus [Line Items] rr_ProspectusLineItems  
1 Year rr_AverageAnnualReturnYear01 12.01% [1],[2]
Since Inception rr_AverageAnnualReturnSinceInception 3.17% [1],[2]
Inception Date rr_AverageAnnualReturnInceptionDate Dec. 31, 2019
Putnam Multi-Asset Income Fund | Class A Shares  
Prospectus [Line Items] rr_ProspectusLineItems  
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice 4.00%
Maximum Deferred Sales Charge (as a percentage) rr_MaximumDeferredSalesChargeOverOther 1.00% [3]
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.46%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.25%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.38% [4]
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 1.09%
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.26%) [4],[5]
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 0.83%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 481
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 708
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 953
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,653
1 Year rr_AverageAnnualReturnYear01 6.33% [6]
Since Inception rr_AverageAnnualReturnSinceInception 0.68% [6]
Inception Date rr_AverageAnnualReturnInceptionDate Dec. 31, 2019
Putnam Multi-Asset Income Fund | Class C Shares  
Prospectus [Line Items] rr_ProspectusLineItems  
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (as a percentage) rr_MaximumDeferredSalesChargeOverOther 1.00% [7]
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.46%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 1.00%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.38% [4]
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 1.84%
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.26%) [4],[5]
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 1.58%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 261
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 553
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 971
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 1,940
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 161
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 553
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 971
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 $ 1,940
1 Year rr_AverageAnnualReturnYear01 8.91% [8]
Since Inception rr_AverageAnnualReturnSinceInception 0.93% [8]
Inception Date rr_AverageAnnualReturnInceptionDate Dec. 31, 2019
Putnam Multi-Asset Income Fund | Class P Shares  
Prospectus [Line Items] rr_ProspectusLineItems  
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (as a percentage) rr_MaximumDeferredSalesChargeOverOther none
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.46%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.21% [4]
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 0.67%
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.26%) [4],[5]
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 0.41%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 42
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 188
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 347
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 810
Annual Return 2020 rr_AnnualReturn2020 8.46%
Annual Return 2021 rr_AnnualReturn2021 6.25%
Annual Return 2022 rr_AnnualReturn2022 (12.36%)
Annual Return 2023 rr_AnnualReturn2023 11.40%
1 Year rr_AverageAnnualReturnYear01 11.40%
Since Inception rr_AverageAnnualReturnSinceInception 2.99%
Inception Date rr_AverageAnnualReturnInceptionDate Dec. 31, 2019
Putnam Multi-Asset Income Fund | Class P Shares | After Taxes on Distributions  
Prospectus [Line Items] rr_ProspectusLineItems  
1 Year rr_AverageAnnualReturnYear01 10.14%
Since Inception rr_AverageAnnualReturnSinceInception 2.01%
Inception Date rr_AverageAnnualReturnInceptionDate Dec. 31, 2019
Putnam Multi-Asset Income Fund | Class P Shares | After Taxes on Distributions and Sales  
Prospectus [Line Items] rr_ProspectusLineItems  
1 Year rr_AverageAnnualReturnYear01 6.70%
Since Inception rr_AverageAnnualReturnSinceInception 1.93%
Inception Date rr_AverageAnnualReturnInceptionDate Dec. 31, 2019
Putnam Multi-Asset Income Fund | Class R Shares  
Prospectus [Line Items] rr_ProspectusLineItems  
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (as a percentage) rr_MaximumDeferredSalesChargeOverOther none
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.46%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.50%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.38% [4]
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 1.34%
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.26%) [4],[5]
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 1.08%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 110
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 399
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 709
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,590
1 Year rr_AverageAnnualReturnYear01 10.39% [8]
Since Inception rr_AverageAnnualReturnSinceInception 1.45% [8]
Inception Date rr_AverageAnnualReturnInceptionDate Dec. 31, 2019
Putnam Multi-Asset Income Fund | Class R5 Shares  
Prospectus [Line Items] rr_ProspectusLineItems  
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (as a percentage) rr_MaximumDeferredSalesChargeOverOther none
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.46%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.35% [4]
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 0.81%
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.26%) [4],[5]
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 0.55%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 56
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 233
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 424
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 977
1 Year rr_AverageAnnualReturnYear01 11.01% [9]
Since Inception rr_AverageAnnualReturnSinceInception 1.94% [9]
Inception Date rr_AverageAnnualReturnInceptionDate Dec. 31, 2019
Putnam Multi-Asset Income Fund | Class R6 Shares  
Prospectus [Line Items] rr_ProspectusLineItems  
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (as a percentage) rr_MaximumDeferredSalesChargeOverOther none
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.46%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.25% [4]
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 0.71%
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.26%) [4],[5]
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 0.45%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 46
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 201
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 369
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 858
1 Year rr_AverageAnnualReturnYear01 11.12% [9]
Since Inception rr_AverageAnnualReturnSinceInception 2.05% [9]
Inception Date rr_AverageAnnualReturnInceptionDate Dec. 31, 2019
Putnam Multi-Asset Income Fund | Class Y Shares  
Prospectus [Line Items] rr_ProspectusLineItems  
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (as a percentage) rr_MaximumDeferredSalesChargeOverOther none
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.46%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.38% [4]
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 0.84%
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.26%) [4],[5]
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 0.58%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 59
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 242
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 440
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,013
1 Year rr_AverageAnnualReturnYear01 11.00% [9]
Since Inception rr_AverageAnnualReturnSinceInception 1.97% [9]
Inception Date rr_AverageAnnualReturnInceptionDate Dec. 31, 2019
Putnam Multi-Asset Income Fund | Risk Lose Money [Member]  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock It is important to understand that you can lose money by investing in the fund.
Putnam Multi-Asset Income Fund | Risk Not Insured Depository Institution [Member]  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock An investment in the fund is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency.
[1] The table above compares the fund’s returns to the performance of two indexes: (i) the Bloomberg U.S. Aggregate Bond Index, a broad measure of market performance, and (ii) the Putnam Multi-Asset Income Blended Benchmark, and additional index that the Investment Manager (as defined below) believes more closely reflects the fund’s principal investment objective and strategies.
[2] The Putnam Multi-Asset Income Blended Benchmark is an unmanaged index administered by the Investment Manager, 55% of which is the Bloomberg U.S. Aggregate Index, 22.5% of which is the Russell 3000® Index, 18% of which is the JPMorgan Developed High Yield Index, and 4.5% of which is the MSCI EAFE Index-NR. Prior to July 12, 2022, the benchmark was comprised as follows: 55% Bloomberg U.S. Aggregate Index, 21% Russell 3000® Index, 14% JPMorgan Developed High Yield Index, 6% ICE BofA U.S. Treasury Bill Index, and 4% MSCI EAFE Index-NR. The benchmark composition was changed because, in Putnam Investment Management, LLC’s opinion, the new composition more accurately reflects the fund’s allocation investment approach.
[3] Applies only to certain redemptions of shares bought with no initial sales charge.
[4] Restated to reflect current fees.
[5] Reflects the Investment Manager’s (as defined below) contractual obligation through December 30, 2025 to waive fees and/or reimburse expenses of the fund to the extent that the total annual fund operating expenses (excluding payments under the fund’s distribution plans, brokerage, interest, taxes, investor servicing fees, investment-related expenses, extraordinary expenses, and acquired fund fees and expenses) would exceed an annual rate of 0.40% of the fund’s average net assets. Also reflects the Investment Manager’s contractual obligation through December 30, 2025 to waive fees and/or reimburse expenses of the fund to the extent necessary to limit the cumulative expenses of the fund (excluding payments under the fund’s management contract, payments under the fund’s distribution plans, brokerage, interest, taxes, investor servicing fees, investment-related expenses, extraordinary expenses, and acquired fund fees and expenses) to an annual (measured on a fiscal year basis) rate of 0.20% of the fund’s average net assets. These obligations may be modified or discontinued only with approval of the Board of Trustees.
[6] Performance for class A shares prior to their inception on February 10, 2023 is derived from the historical performance of class P shares, adjusted for the sales charge and higher 12b-1 fees and investor servicing fees applicable to class A shares.
[7] This charge is eliminated after one year.
[8] Performance for class C and class R shares prior to their inception on February 10, 2023 is derived from the historical performance of class P shares, adjusted for the higher 12b-1 fees and investor servicing fees applicable to class C and class R shares.
[9] Performance for classes R5, R6, and Y shares prior to their inception on February 10, 2023 is derived from the historical performance of class P shares, adjusted for the higher investor servicing fees applicable to class R5, class R6 and class Y shares.