S000003873 [Member] Expense Example - Putnam VT Large Cap Growth Fund |
Dec. 31, 2025
USD ($)
|
|---|---|
| Class IA Shares | |
| Prospectus [Line Items] | |
| Expense Example, with Redemption, 1 Year | $ 63 |
| Expense Example, with Redemption, 3 Years | 198 |
| Expense Example, with Redemption, 5 Years | 345 |
| Expense Example, with Redemption, 10 Years | 774 |
| Class IB Shares | |
| Prospectus [Line Items] | |
| Expense Example, with Redemption, 1 Year | 89 |
| Expense Example, with Redemption, 3 Years | 277 |
| Expense Example, with Redemption, 5 Years | 481 |
| Expense Example, with Redemption, 10 Years | $ 1,072 |