v3.26.1
S000004353 [Member] Average Annual Total Returns
 12 Months Ended 60 Months Ended 120 Months Ended 294 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 Data Center, Tower REIT and Communications Equipment Index (Spliced) (Returns do not reflect deductions for fees, expenses or taxes)        
Prospectus [Line Items]        
Average Annual Return, Percent [1] 7.24% 8.64% 9.91%  
iShares U.S. Digital Infrastructure and Real Estate ETF        
Prospectus [Line Items]        
Average Annual Return, Percent 6.80% 8.17% 9.49%  
Performance Inception Date       Jul. 10, 2001
iShares U.S. Digital Infrastructure and Real Estate ETF | After Taxes on Distributions        
Prospectus [Line Items]        
Average Annual Return, Percent 6.43% 7.94% 9.29%  
iShares U.S. Digital Infrastructure and Real Estate ETF | After Taxes on Distributions and Sales        
Prospectus [Line Items]        
Average Annual Return, Percent 4.16% 6.39% 7.77%  
[1] The S&P Data Center, Tower REIT and Communications Equipment Index (Spliced) reflects the performance of the S&P North American Technology Multimedia Networking Index through December 17, 2023 and the S&P Data Center, Tower REIT and Communications Equipment Index thereafter, which reflect the times when each index was the Underlying Index of the Fund.