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S000003896 [Member] Investment Strategy - Putnam VT Global Asset Allocation Fund
Dec. 31, 2025
Prospectus [Line Items]  
Strategy [Heading] Investments, risks, and performance Investments
Strategy Narrative [Text Block]
The fund invests a majority of its assets in a diversified portfolio of equity securities (growth or value stocks or both) of both U.S. and foreign companies of any size. The Investment Manager, as defined below, 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. The fund may 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). The Investment Manager 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. The Investment Manager may also select other investments that do not fall within these asset classes. The Investment Manager 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.