Investor A C And Institutional [Member] Investment Objectives and Goals - Investor A, C and Institutional - BlackRock Systematic Multi-Strategy Fund |
Dec. 31, 2025 |
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| Prospectus [Line Items] | |
| Risk/Return [Heading] | Fund OverviewKey Facts About BlackRock Systematic Multi-Strategy Fund |
| Objective [Heading] | Investment Objective |
| Objective, Primary [Text Block] | The investment objective of BlackRock Systematic Multi-Strategy Fund (the “Fund”), a series of BlackRock Funds IV (the “Trust”), is to seek total return comprised of current income and capital appreciation.
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