iShares Systematic Alternatives Active ETF S000095901 [Member] C000264683 [Member] Debt Securities Risk [Member] Derivatives Risks [Member] Commodities Related Investments Risk [Member] Model Risk [Member] Assets Under Management AUM Risk [Member] Authorized Participant Concentration Risk [Member] Contingent Convertible Bonds CoCos Risk [Member] Convertible Securities Risk [Member] Corporate Loans Risk [Member] Cryptocurrency Risk [Member] Depositary Receipts Risk [Member] Dollar Rolls Risk [Member] Emerging Markets Risk [Member] Foreign Currency Transactions Risk [Member] Foreign Securities Risk [Member] High Portfolio Turnover Risk [Member] High Yield Bonds Risk [Member] Indexed and Inverse Securities Risk [Member] Investment in Other Investment Companies Risk [Member] Issuer Risk [Member] Large Capitalization Companies Risk [Member] Large Shareholder and Large Scale Redemption Risk [Member] Leverage Risk [Member] Market Risk and Selection Risk [Member] Market Trading Risk [Member] Mezzanine Securities Risk [Member] New Fund Risk [Member] Operational and Technology Risks [Member] Preferred Securities Risk [Member] Repurchase Agreements and Purchase and Sale Contracts Risk [Member] Reverse Repurchase Agreements Risk [Member] Risk of Investing in the United States [Member] Second Lien Loans Risk [Member] Short Sales and Short Position Risk [Member] Small and Mid Capitalization Company Risk [Member] Small Fund Risk [Member] Structured Securities Risk [Member] Subsidiary Risk [Member] Tax Risk Straddle Rules [Member] U S Government Obligations Risk [Member] Variable and Floating Rate Instrument Risk [Member] When Issued and Delayed Settlement Transactions Risk [Member] Equity Securities Risk [Member]