S000059910 [Member] Expense Example - BlackRock Small Cap Index V.I. Fund |
Dec. 31, 2025
USD ($)
|
|---|---|
| Class I | |
| Prospectus [Line Items] | |
| Expense Example, with Redemption, 1 Year | $ 23 |
| Expense Example, with Redemption, 3 Years | 71 |
| Expense Example, with Redemption, 5 Years | 124 |
| Expense Example, with Redemption, 10 Years | 280 |
| Class III | |
| Prospectus [Line Items] | |
| Expense Example, with Redemption, 1 Year | 48 |
| Expense Example, with Redemption, 3 Years | 151 |
| Expense Example, with Redemption, 5 Years | 263 |
| Expense Example, with Redemption, 10 Years | $ 591 |