S000002875 [Member] Investment Objectives and Goals - BlackRock S&P 500 Index V.I. Fund |
Dec. 31, 2025 |
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| Prospectus [Line Items] | |
| Risk/Return [Heading] | Fund Overview Key Facts About BlackRock S&P 500 Index V.I. Fund |
| Objective [Heading] | Investment Objective |
| Objective, Primary [Text Block] | The investment objective of BlackRock S&P 500 Index V.I. Fund (the “Fund”) is to seek investment results that, before expenses, correspond to the aggregate price and yield performance of the Standard & Poor’s 500 Index (the “S&P 500” or the “Underlying Index”).
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