S000003870 [Member] Investment Objectives and Goals - BlackRock Government Money Market Portfolio |
Dec. 31, 2025 |
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| Prospectus [Line Items] | |
| Risk/Return [Heading] | Fund Overview Key Facts About BlackRock Government Money Market Portfolio |
| Objective [Heading] | Investment Objective |
| Objective, Primary [Text Block] | The investment objective of the BlackRock Government Money Market Portfolio (the “Government Money Market Portfolio” or the “Fund”), a series of BlackRock Series Fund, Inc. (the “Corporation”), is to seek to preserve capital, to maintain liquidity and achieve the highest possible current income consistent with the foregoing.
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