Class K [Member] Investment Objectives and Goals - Class K - BlackRock U.S. Insights Long/Short Equity Fund |
May 31, 2025 |
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| Prospectus [Line Items] | |
| Risk/Return [Heading] | Fund OverviewKey Facts About BlackRock U.S. Insights Long/Short Equity Fund |
| Objective [Heading] | Investment Objective |
| Objective, Primary [Text Block] | The investment objective of BlackRock U.S. Insights Long/Short Equity Fund (the “Fund”), a series of BlackRock FundsSM (the “Trust”), is to seek total return over the long-term.
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