Service Shares [Member] Investment Objectives and Goals - Service Shares - BLACKROCK HEALTH SCIENCES OPPORTUNITIES PORTFOLIO |
May 31, 2026 |
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| Prospectus [Line Items] | |
| Risk/Return [Heading] | Fund Overview Key Facts About BlackRock Health Sciences Opportunities Portfolio |
| Objective [Heading] | Investment Objective |
| Objective, Primary [Text Block] | The investment objective of BlackRock Health Sciences Opportunities Portfolio (the “Fund”), a series of BlackRock FundsSM (the “Trust”), is to provide long-term growth of capital.
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