S000002877 [Member] Expense Example - BlackRock Large Cap Focus Growth V.I. Fund |
Dec. 31, 2025
USD ($)
|
|---|---|
| Class I | |
| Prospectus [Line Items] | |
| Expense Example, with Redemption, 1 Year | $ 79 |
| Expense Example, with Redemption, 3 Years | 274 |
| Expense Example, with Redemption, 5 Years | 486 |
| Expense Example, with Redemption, 10 Years | 1,096 |
| Class III | |
| Prospectus [Line Items] | |
| Expense Example, with Redemption, 1 Year | 104 |
| Expense Example, with Redemption, 3 Years | 352 |
| Expense Example, with Redemption, 5 Years | 620 |
| Expense Example, with Redemption, 10 Years | $ 1,386 |