v3.25.2
S000004360 [Member] Investment Objectives and Goals - iShares 20+ Year Treasury Bond ETF
Feb. 28, 2025
Prospectus [Line Items]  
Risk/Return [Heading] iSHARES® 20+ YEAR TREASURY BOND ETFTicker: TLTStock Exchange: Nasdaq
Objective [Heading] Investment Objective
Objective, Primary [Text Block]
The iShares 20+ Year Treasury Bond ETF (the Fund) seeks to track the investment results of an index composed of U.S. Treasury bonds with remaining maturities greater than twenty years.