S000003878 [Member] Expense Example, No Redemption - Putnam VT International Value Fund |
Dec. 31, 2025
USD ($)
|
|---|---|
| Class IA Shares | |
| Prospectus [Line Items] | |
| Expense Example, No Redemption, 1 Year | $ 83 |
| Expense Example, No Redemption, 3 Years | 259 |
| Expense Example, No Redemption, 5 Years | 450 |
| Expense Example, No Redemption, 10 Years | 1,003 |
| Class IB Shares | |
| Prospectus [Line Items] | |
| Expense Example, No Redemption, 1 Year | 108 |
| Expense Example, No Redemption, 3 Years | 337 |
| Expense Example, No Redemption, 5 Years | 584 |
| Expense Example, No Redemption, 10 Years | $ 1,293 |