S000002887 [Member] Expense Example - BlackRock Global Allocation V.I. Fund |
Dec. 31, 2025
USD ($)
|
|---|---|
| Class I | |
| Prospectus [Line Items] | |
| Expense Example, with Redemption, 1 Year | $ 78 |
| Expense Example, with Redemption, 3 Years | 251 |
| Expense Example, with Redemption, 5 Years | 440 |
| Expense Example, with Redemption, 10 Years | 986 |
| Class II | |
| Prospectus [Line Items] | |
| Expense Example, with Redemption, 1 Year | 93 |
| Expense Example, with Redemption, 3 Years | 320 |
| Expense Example, with Redemption, 5 Years | 566 |
| Expense Example, with Redemption, 10 Years | 1,270 |
| Class III | |
| Prospectus [Line Items] | |
| Expense Example, with Redemption, 1 Year | 103 |
| Expense Example, with Redemption, 3 Years | 351 |
| Expense Example, with Redemption, 5 Years | 619 |
| Expense Example, with Redemption, 10 Years | $ 1,385 |