iShares Macro AlphaBeta Active ETF S000109945 [Member] C000281133 [Member] Equity Securities Risk [Member] Debt Securities Risk [Member] Leverage Risk [Member] Allocation Risk [Member] Assets Under Management AUM Risk [Member] Authorized Participant Concentration Risk [Member] Cash Transactions Risk [Member] Collateralized Debt Obligations Risk [Member] Commodities Related Investment Risk [Member] Convertible Securities Risk [Member] Corporate Loans Risk [Member] Counterparty Risk [Member] Depositary Receipts Risk [Member] Distressed Securities Risk [Member] Dollar Rolls Risk [Member] Emerging Markets Risk [Member] Foreign Securities Risk [Member] High Portfolio Turnover Risk [Member] High Yield Bonds Risk [Member] Illiquid Investments Risk [Member] Indexed and Inverse Securities Risk [Member] Investment Style Risk [Member] Large Capitalization Companies Risk [Member] Large Shareholder and Large Scale Redemption Risk [Member] Market Risk and Selection Risk [Member] Market Trading Risk [Member] Mid Cap Securities Risk [Member] Money Market Securities Risk [Member] Mortgage and Asset Backed Securities Risks [Member] Municipal Securities Risks [Member] New Fund Risk [Member] Operational and Technology Risks [Member] Preferred Securities Risk [Member] Real Estate Related Securities Risk [Member] REIT Investment Risk [Member] Repurchase Agreements and Purchase and Sale Contracts Risk [Member] Reverse Repurchase Agreements Risk [Member] Risk of Investing in the United States [Member] Risks of Loan Assignments and Participations [Member] Second Lien Loans Risk [Member] Senior Loans Risk [Member] Short Sales and Short Position Risk [Member] Small Cap and Emerging Growth Securities Risk [Member] Small Fund Risk [Member] Sovereign Debt Risk [Member] Structured Notes Risk [Member] Structured Securities Risk [Member] Subsidiary Risk [Member] Supranational Entities Risk [Member] Tax Risk [Member] Tender Option Bonds and Related Securities Risk [Member] U S Government Mortgage Related Securities Risk [Member] U S Government Obligations Risk [Member] Variable and Floating Rate Instrument Risk [Member] Warrants Risk [Member] Zero Coupon Securities Risk [Member] Inflation Indexed Bonds Risk [Member] Derivatives Risks [Member]