Investor A Institutional [Member] Investment Objectives and Goals - Investor A Institutional [Member] - iShares Developed Real Estate Index Fund

Jan. 31, 2026

Prospectus [Line Items]

Risk/Return [Heading]

Fund Overview Key Facts About iShares Developed Real Estate Index Fund

Objective [Heading]

Investment Objective

Objective, Primary [Text Block]

The investment objective of iShares Developed Real Estate Index Fund (the “Fund”), a series of BlackRock FundsSM (the “Trust”), is to seek to track the investment results of an index composed of real estate equities in developed markets.