S000002874 [Member] Expense Example - BlackRock Managed Volatility V.I. Fund |
Dec. 31, 2025
USD ($)
|
|---|---|
| Class I | |
| Prospectus [Line Items] | |
| Expense Example, with Redemption, 1 Year | $ 61 |
| Expense Example, with Redemption, 3 Years | 289 |
| Expense Example, with Redemption, 5 Years | 536 |
| Expense Example, with Redemption, 10 Years | 1,242 |
| Class III | |
| Prospectus [Line Items] | |
| Expense Example, with Redemption, 1 Year | 87 |
| Expense Example, with Redemption, 3 Years | 370 |
| Expense Example, with Redemption, 5 Years | 674 |
| Expense Example, with Redemption, 10 Years | $ 1,539 |