S000002875 [Member] Expense Example - BlackRock S&P 500 Index V.I. Fund |
Dec. 31, 2025
USD ($)
|
|---|---|
| Class I | |
| Prospectus [Line Items] | |
| Expense Example, with Redemption, 1 Year | $ 13 |
| Expense Example, with Redemption, 3 Years | 42 |
| Expense Example, with Redemption, 5 Years | 73 |
| Expense Example, with Redemption, 10 Years | 166 |
| Class II | |
| Prospectus [Line Items] | |
| Expense Example, with Redemption, 1 Year | 30 |
| Expense Example, with Redemption, 3 Years | 93 |
| Expense Example, with Redemption, 5 Years | 163 |
| Expense Example, with Redemption, 10 Years | 368 |
| Class III | |
| Prospectus [Line Items] | |
| Expense Example, with Redemption, 1 Year | 40 |
| Expense Example, with Redemption, 3 Years | 125 |
| Expense Example, with Redemption, 5 Years | 219 |
| Expense Example, with Redemption, 10 Years | $ 493 |