S000003893 [Member] Expense Example, No Redemption - Putnam VT Diversified Income Fund |
Dec. 31, 2025
USD ($)
|
|---|---|
| Class IA Shares | |
| Prospectus [Line Items] | |
| Expense Example, No Redemption, 1 Year | $ 82 |
| Expense Example, No Redemption, 3 Years | 256 |
| Expense Example, No Redemption, 5 Years | 444 |
| Expense Example, No Redemption, 10 Years | 990 |
| Class IB Shares | |
| Prospectus [Line Items] | |
| Expense Example, No Redemption, 1 Year | 107 |
| Expense Example, No Redemption, 3 Years | 334 |
| Expense Example, No Redemption, 5 Years | 579 |
| Expense Example, No Redemption, 10 Years | $ 1,282 |