S000003867 [Member] Investment Objectives and Goals - BlackRock Capital Appreciation Portfolio |
Dec. 31, 2025 |
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| Prospectus [Line Items] | |
| Risk/Return [Heading] | Fund Overview Key Facts About BlackRock Capital Appreciation Portfolio |
| Objective [Heading] | Investment Objective |
| Objective, Primary [Text Block] | The investment objective of BlackRock Capital Appreciation Portfolio (the “Capital Appreciation Portfolio” or the “Fund”), a series of BlackRock Series Fund, Inc. (the “Corporation”), is to seek long-term growth of capital.
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