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S000003882 [Member] Investment Objectives and Goals - Putnam VT Government Money Market Fund
Dec. 31, 2025
Prospectus [Line Items]  
Risk/Return [Heading] Fund summary
Objective [Heading] Goal
Objective, Primary [Text Block]
The fund seeks as high a rate of current income as the Investment Manager (as defined below) believes is consistent with preservation of capital and maintenance of liquidity.