S000003871 [Member] Investment Objectives and Goals - Putnam VT Mortgage Securities 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 level of current income as the Investment Manager (as defined below) believes is consistent with preservation of capital.
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