S000003879 [Member] Expense Example - Putnam VT Emerging Markets Equity Fund |
Dec. 31, 2025
USD ($)
|
|---|---|
| Class IA Shares | |
| Prospectus [Line Items] | |
| Expense Example, with Redemption, 1 Year | $ 112 |
| Expense Example, with Redemption, 3 Years | 426 |
| Expense Example, with Redemption, 5 Years | 763 |
| Expense Example, with Redemption, 10 Years | 1,715 |
| Class IB Shares | |
| Prospectus [Line Items] | |
| Expense Example, with Redemption, 1 Year | 137 |
| Expense Example, with Redemption, 3 Years | 503 |
| Expense Example, with Redemption, 5 Years | 894 |
| Expense Example, with Redemption, 10 Years | $ 1,989 |