S000059909 [Member] Expense Example - BlackRock International Index V.I. Fund |
Dec. 31, 2025
USD ($)
|
|---|---|
| Class I | |
| Prospectus [Line Items] | |
| Expense Example, with Redemption, 1 Year | $ 28 |
| Expense Example, with Redemption, 3 Years | 89 |
| Expense Example, with Redemption, 5 Years | 156 |
| Expense Example, with Redemption, 10 Years | 355 |
| Class III | |
| Prospectus [Line Items] | |
| Expense Example, with Redemption, 1 Year | 53 |
| Expense Example, with Redemption, 3 Years | 169 |
| Expense Example, with Redemption, 5 Years | 295 |
| Expense Example, with Redemption, 10 Years | $ 664 |