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S000004350 [Member] Investment Objectives and Goals - iShares Biotechnology ETF
Mar. 31, 2026
Prospectus [Line Items]  
Risk/Return [Heading] iShares Biotechnology ETF IBB | Nasdaq
Objective [Heading] Investment Objective
Objective, Primary [Text Block]
The iShares Biotechnology ETF (the Fund) seeks to track the investment results of an index composed of U.S.-listed equities in the biotechnology sector.