v3.26.1
S000004333 [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 Telecommunications 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] 29.84% 5.10% 4.42%  
iShares U.S. Telecommunications ETF        
Prospectus [Line Items]        
Average Annual Return, Percent 29.28% 4.74% 4.18%  
Performance Inception Date       May 22, 2000
iShares U.S. Telecommunications ETF | After Taxes on Distributions        
Prospectus [Line Items]        
Average Annual Return, Percent 28.57% 4.14% 3.52%  
iShares U.S. Telecommunications ETF | After Taxes on Distributions and Sales        
Prospectus [Line Items]        
Average Annual Return, Percent 17.72% 3.55% 3.13%  
[1] The Russell 1000 Telecommunications RIC 22.5/45 Capped Index (Spliced) reflects the performance of the Dow Jones U.S. Select Telecommunications Index through September 19, 2021 and the Russell 1000 Telecommunications RIC 22.5/45 Capped Index thereafter, which reflect the times when each index was the Underlying Index of the Fund.