iShares 0-3 Month Treasury Bond ETF [Member] iShares 0-3 Month Treasury Bond ETF Investments [Domain] Treasury Securities [Member] Treasury Securities S&P 500 Index [Member] S&P 500 Index Cash and Cash Equivalents1 [Member] Cash and Cash Equivalents1 United States Treasury Note/Bond, 3.38%, 11/30/2027 [Member] United States Treasury Note/Bond, 3.38%, 11/30/2027 C000241458 [Member] C000241458 MKAM United States Treasury Note/Bond, 3.75%, 06/30/2027 [Member] United States Treasury Note/Bond, 3.75%, 06/30/2027 Standard & Poor's 500 Index [Member] iShares Core S&P 500 ETF [Member] iShares Core S&P 500 ETF Exchange Traded Funds1 [Member] Exchange Traded Funds1 United States Treasury Note/Bond, 0.63%, 07/31/2026 [Member] United States Treasury Note/Bond, 0.63%, 07/31/2026 Net Assets Investment Company, Portfolio Turnover Investment Type [Axis]