S000003875 [Member] Expense Example, No Redemption - Putnam VT High Yield Fund |
Dec. 31, 2025
USD ($)
|
|---|---|
| Class IA Shares | |
| Prospectus [Line Items] | |
| Expense Example, No Redemption, 1 Year | $ 73 |
| Expense Example, No Redemption, 3 Years | 228 |
| Expense Example, No Redemption, 5 Years | 396 |
| Expense Example, No Redemption, 10 Years | 882 |
| Class IB Shares | |
| Prospectus [Line Items] | |
| Expense Example, No Redemption, 1 Year | 98 |
| Expense Example, No Redemption, 3 Years | 306 |
| Expense Example, No Redemption, 5 Years | 531 |
| Expense Example, No Redemption, 10 Years | $ 1,177 |