iShares Flexible Equity Active ETF S000104279 [Member] C000274880 [Member] Foreign Securities Risk [Member] Quantitative Model Risk [Member] Market Risk and Selection Risk [Member] Authorized Participant Concentration Risk [Member] Cash Transactions Risk [Member] Commodities Related Investments Risk [Member] Convertible Securities Risk [Member] Derivatives Risks [Member] High Portfolio Turnover Risk [Member] Indexed and Inverse Securities Risk [Member] Large Capitalization Companies Risk [Member] Large Shareholder and Large Scale Redemption Risk [Member] Leverage Risk [Member] Market Trading Risk [Member] Mid Cap Securities Risk [Member] New Fund Risk [Member] Operational and Technology Risks [Member] Real Estate Related Securities Risk [Member] Risk of Investing in the United States [Member] Short Sales Risk [Member] Small Cap and Emerging Growth Securities Risk [Member] Small Fund Risk [Member] Subsidiary Risk [Member] Equity Securities Risk [Member]