S000003887 [Member] Investment Objectives and Goals - Putnam VT Research Fund |
Dec. 31, 2025 |
|---|---|
| Prospectus [Line Items] | |
| Risk/Return [Heading] | Fund summary Prior to May 1, 2026, Putnam VT U.S. Research Fund was named Putnam VT Research Fund. |
| Objective [Heading] | Goal |
| Objective, Primary [Text Block] | The fund seeks capital appreciation.
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