S000003897 [Member] Expense Example, No Redemption - Putnam VT Focused International Equity Fund |
Dec. 31, 2025
USD ($)
|
|---|---|
| Class IA Shares | |
| Prospectus [Line Items] | |
| Expense Example, No Redemption, 1 Year | $ 80 |
| Expense Example, No Redemption, 3 Years | 260 |
| Expense Example, No Redemption, 5 Years | 456 |
| Expense Example, No Redemption, 10 Years | 1,021 |
| Class IB Shares | |
| Prospectus [Line Items] | |
| Expense Example, No Redemption, 1 Year | 105 |
| Expense Example, No Redemption, 3 Years | 338 |
| Expense Example, No Redemption, 5 Years | 590 |
| Expense Example, No Redemption, 10 Years | $ 1,313 |