v3.26.1
Average Annual Total Returns
 12 Months Ended 60 Months Ended 120 Months Ended 167 Months Ended
Dec. 31, 2025
Dec. 31, 2025
Dec. 31, 2025
Dec. 31, 2025
S&P Total Market Index (Returns do not reflect deductions for fees, expenses or taxes)        
Prospectus [Line Items]        
Average Annual Return, Percent 17.05% 13.07% 14.22%  
S&P U.S. Power Infrastructure Select Index (Spliced) (Returns do not reflect deductions for fees, expenses or taxes except as noted)        
Prospectus [Line Items]        
Average Annual Return, Percent [1],[2] 10.18% 17.79% 7.85%  
MSCI All Country World Index (Net) (Returns do not reflect deductions for fees, expenses or taxes except for withholding taxes on reinvested dividends)        
Prospectus [Line Items]        
Average Annual Return, Percent [1],[3] 22.34% 11.19% 11.72%  
iShares U.S. Power Infrastructure ETF        
Prospectus [Line Items]        
Average Annual Return, Percent 10.04% 18.20% 8.16%  
Performance Inception Date       Jan. 31, 2012
iShares U.S. Power Infrastructure ETF | After Taxes on Distributions        
Prospectus [Line Items]        
Average Annual Return, Percent 8.18% 16.85% 7.12%  
iShares U.S. Power Infrastructure ETF | After Taxes on Distributions and Sales        
Prospectus [Line Items]        
Average Annual Return, Percent 7.28% 14.68% 6.48%  
[1] Returns for net indices generally assume the reinvestment of dividends after the deduction of the maximum withholding tax in each country applicable to non-residents of the country as determined by the index provider. Such indices use withholding tax rates that are often at a higher rate than the rates to which the Fund is subject in each country, including for countries where the Fund is not subject to withholding taxes. When this is the case, index performance will be lower than if the index used the Fund's applicable withholding tax rates, if any.
[2] The S&P U.S. Power Infrastructure Select Index (Spliced) reflects the performance of the MSCI ACWI Select Energy Producers Investable Market Index (Net) through October 28, 2025 and the S&P U.S. Power Infrastructure Select Index thereafter, which reflect the times when each index was the Underlying Index of the Fund.
[3] The Fund will no longer compare its performance to the MSCI All Country World Index (Net) effective approximately one year from October 29, 2025.