iShares US Power Infrastructure ETF i Shares US Power Infrastructure ETF [Member] iShares U.S. Power Infrastructure ETF S000035884 [Member] S&P Total Market Index (Returns do not reflect deductions for fees, expenses or taxes) SP Total Market Index [Member] S&P U.S. Power Infrastructure Select Index (Spliced) (Returns do not reflect deductions for fees, expenses or taxes except as noted) SP US Power Infrastructure Select Index [Member] MSCI All Country World Index (Net) (Returns do not reflect deductions for fees, expenses or taxes except for withholding taxes on reinvested dividends) MSCI All Country World Index [Member] C000109987 [Member] iShares U.S. Power Infrastructure ETF For Participants Industrial Companies Risk [Member] Risk of Investing in the US [Member] Equity Securities Risk [Member] Index Related Risk [Member] Asset Class Risk [Member] Commodity Risk [Member] Concentration Risk [Member] Issuer Risk [Member] Large Capitalization Companies Risk [Member] Management Risk [Member] Market Trading Risk [Member] Securities Lending Risk [Member] Tracking Error Risk [Member] Valuation Risk [Member] Market Risks [Member] Authorized Participant Concentration Risk [Member] Operational and Technology Risks [Member] Utility Companies Risk [Member]