S000075203 [Member] Investment Objectives and Goals - iShares U.S. Long Credit Bond Index Fund

Oct. 31, 2025

Prospectus [Line Items]

Risk/Return [Heading]

Fund Overview Key Facts About iShares U.S. Long Credit Bond Index Fund

Objective [Heading]

Investment Objective

Objective, Primary [Text Block]

The investment objective of iShares U.S. Long Credit Bond Index Fund (the “Fund”), a series of BlackRock Funds^SM (the “Trust”), is to seek to provide investment results that correspond to the total return performance of fixed-income securities, in aggregate, as represented by the Bloomberg U.S. Long Credit Index (or the “Underlying Index”).