v3.25.2
S000004361 [Member] Average Annual Total Returns
 12 Months Ended 60 Months Ended 120 Months Ended 269 Months Ended
Dec. 31, 2024
Dec. 31, 2024
Dec. 31, 2024
Dec. 31, 2024
Bloomberg U.S. Universal Index (Returns do not reflect deductions for fees, expenses or taxes)        
Prospectus [Line Items]        
Average Annual Return, Percent [1] 2.04% 0.06% 1.73%  
Markit iBoxx USD Liquid Investment Grade Index (Returns do not reflect deductions for fees, expenses or taxes)        
Prospectus [Line Items]        
Average Annual Return, Percent 1.15% (0.07%) 2.46%  
iShares iBoxx $ Investment Grade Corporate Bond ETF        
Prospectus [Line Items]        
Average Annual Return, Percent 0.99% (0.20%) 2.28%  
Performance Inception Date       Jul. 22, 2002
iShares iBoxx $ Investment Grade Corporate Bond ETF | After Taxes on Distributions        
Prospectus [Line Items]        
Average Annual Return, Percent (0.79%) (1.55%) 0.87%  
iShares iBoxx $ Investment Grade Corporate Bond ETF | After Taxes on Distributions and Sales        
Prospectus [Line Items]        
Average Annual Return, Percent 0.58% (0.71%) 1.14%  
[1] The Fund has added this broad-based index in response to new regulatory requirements.