Investor A, C, Institutional and Class R [Member] Investment Objectives and Goals - Investor A, C, Institutional and Class R [Member] - BLACKROCK HEALTH SCIENCES OPPORTUNITIES PORTFOLIO

May 31, 2025

Prospectus [Line Items]

Risk/Return [Heading]

Fund OverviewKey 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.