S000002882 [Member] Expense Example - BlackRock Basic Value V.I. Fund |
Dec. 31, 2025
USD ($)
|
|---|---|
| Class I | |
| Prospectus [Line Items] | |
| Expense Example, with Redemption, 1 Year | $ 76 |
| Expense Example, with Redemption, 3 Years | 265 |
| Expense Example, with Redemption, 5 Years | 469 |
| Expense Example, with Redemption, 10 Years | 1,061 |
| Class III | |
| Prospectus [Line Items] | |
| Expense Example, with Redemption, 1 Year | 104 |
| Expense Example, with Redemption, 3 Years | 348 |
| Expense Example, with Redemption, 5 Years | 612 |
| Expense Example, with Redemption, 10 Years | $ 1,365 |