Investor A Institutional and Class R [Member] Investment Objectives and Goals - Investor A Institutional and Class R [Member] - BLACKROCK ADVANTAGE SMALL CAP GROWTH FUND

Sep. 30, 2025

Prospectus [Line Items]

Risk/Return [Heading]

Fund OverviewKey Facts About BlackRock Advantage Small Cap Growth Fund

Objective [Heading]

Investment Objective

Objective, Primary [Text Block]

The investment objective of BlackRock Advantage Small Cap Growth Fund (“Advantage Small Cap Growth”or the “Fund”), a series of BlackRock FundsSM (the “Trust”), is to seek long-term capital growth.