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Class K [Member] Investment Objectives and Goals - Class K - BlackRock Advantage Small Cap Core Fund
May 31, 2025
Prospectus [Line Items]  
Risk/Return [Heading] Fund OverviewKey Facts About BlackRock Advantage Small Cap Core Fund
Objective [Heading] Investment Objective
Objective, Primary [Text Block]
The investment objective of BlackRock Advantage Small Cap Core Fund (the “Fund”), a series of BlackRock FundsSM (the “Trust”), is to seek capital appreciation over the long term.