S000003882 [Member] Expense Example, No Redemption - Putnam VT Government Money Market Fund |
Dec. 31, 2025
USD ($)
|
|---|---|
| Class IA Shares | |
| Prospectus [Line Items] | |
| Expense Example, No Redemption, 1 Year | $ 45 |
| Expense Example, No Redemption, 3 Years | 141 |
| Expense Example, No Redemption, 5 Years | 246 |
| Expense Example, No Redemption, 10 Years | 553 |
| Class IB Shares | |
| Prospectus [Line Items] | |
| Expense Example, No Redemption, 1 Year | 70 |
| Expense Example, No Redemption, 3 Years | 221 |
| Expense Example, No Redemption, 5 Years | 384 |
| Expense Example, No Redemption, 10 Years | $ 859 |