S000003895 [Member] Expense Example, No Redemption - Putnam VT George Putnam Balanced Fund |
Dec. 31, 2025
USD ($)
|
|---|---|
| Class IA Shares | |
| Prospectus [Line Items] | |
| Expense Example, No Redemption, 1 Year | $ 64 |
| Expense Example, No Redemption, 3 Years | 201 |
| Expense Example, No Redemption, 5 Years | 350 |
| Expense Example, No Redemption, 10 Years | 786 |
| Class IB Shares | |
| Prospectus [Line Items] | |
| Expense Example, No Redemption, 1 Year | 90 |
| Expense Example, No Redemption, 3 Years | 281 |
| Expense Example, No Redemption, 5 Years | 488 |
| Expense Example, No Redemption, 10 Years | $ 1,084 |