S000003894 [Member] Expense Example, No Redemption - Putnam VT Large Cap Value Fund |
Dec. 31, 2025
USD ($)
|
|---|---|
| Class IA Shares | |
| Prospectus [Line Items] | |
| Expense Example, No Redemption, 1 Year | $ 55 |
| Expense Example, No Redemption, 3 Years | 173 |
| Expense Example, No Redemption, 5 Years | 302 |
| Expense Example, No Redemption, 10 Years | 678 |
| Class IB Shares | |
| Prospectus [Line Items] | |
| Expense Example, No Redemption, 1 Year | 81 |
| Expense Example, No Redemption, 3 Years | 253 |
| Expense Example, No Redemption, 5 Years | 439 |
| Expense Example, No Redemption, 10 Years | $ 978 |