S000002879 [Member] Expense Example - BlackRock Advantage SMID Cap V.I. Fund |
Dec. 31, 2025
USD ($)
|
|---|---|
| Class I | |
| Prospectus [Line Items] | |
| Expense Example, with Redemption, 1 Year | $ 56 |
| Expense Example, with Redemption, 3 Years | 291 |
| Expense Example, with Redemption, 5 Years | 544 |
| Expense Example, with Redemption, 10 Years | 1,269 |
| Class III | |
| Prospectus [Line Items] | |
| Expense Example, with Redemption, 1 Year | 82 |
| Expense Example, with Redemption, 3 Years | 371 |
| Expense Example, with Redemption, 5 Years | 682 |
| Expense Example, with Redemption, 10 Years | $ 1,566 |