v3.26.1
S000004321 [Member] Average Annual Total Returns
 12 Months Ended 60 Months Ended 120 Months Ended 307 Months Ended
Dec. 31, 2025
Dec. 31, 2025
Dec. 31, 2025
Dec. 31, 2025
Russell 3000 Index (Returns do not reflect deductions for fees, expenses or taxes)        
Prospectus [Line Items]        
Average Annual Return, Percent 17.15% 13.15% 14.29%  
Russell 1000 Energy RIC 22.5/45 Capped Index (Spliced) (Returns do not reflect deductions for fees, expenses or taxes)        
Prospectus [Line Items]        
Average Annual Return, Percent [1] 7.82% 22.81% 7.58%  
iShares U.S. Energy ETF        
Prospectus [Line Items]        
Average Annual Return, Percent 7.41% 22.31% 7.14%  
Performance Inception Date       Jun. 12, 2000
iShares U.S. Energy ETF | After Taxes on Distributions        
Prospectus [Line Items]        
Average Annual Return, Percent 6.68% 21.42% 6.25%  
iShares U.S. Energy ETF | After Taxes on Distributions and Sales        
Prospectus [Line Items]        
Average Annual Return, Percent 4.89% 18.23% 5.52%  
[1] The Russell 1000 Energy RIC 22.5/45 Capped Index (Spliced) reflects the performance of the Dow Jones U.S. Oil & Gas Index through September 19, 2021 and the Russell 1000 Energy RIC 22.5/45 Capped Index thereafter, which reflect the times when each index was the Underlying Index of the Fund.