S000003882 [Member] Investment Strategy - Putnam VT Government Money Market Fund |
Dec. 31, 2025 |
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| Prospectus [Line Items] | |
| Strategy [Heading] | Investments, risks, and performance Investments |
| Strategy Narrative [Text Block] | The fund invests at least 99.5 percent of its total assets in cash, U.S. government securities and repurchase agreements that are fully collateralized by U.S. government securities or cash. The fund invests 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 the fund invests 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, the fund invests at least 80% of its net 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’ notice to shareholders. The securities purchased by the fund are subject to quality, maturity, diversification and other requirements pursuant to rules promulgated by the SEC. The Investment Manager 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.
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