v3.26.1
S000004430 [Member] Average Annual Total Returns
 12 Months Ended 60 Months Ended 120 Months Ended 258 Months Ended
Dec. 31, 2025
Dec. 31, 2025
Dec. 31, 2025
Dec. 31, 2025
Morningstar US Market Index (Returns do not reflect deductions for fees, expenses or taxes)        
Prospectus [Line Items]        
Average Annual Return, Percent 17.35% 13.29% 14.40%  
Morningstar US Mid Cap Broad Growth Index (Spliced) (Returns do not reflect deductions for fees, expenses or taxes)        
Prospectus [Line Items]        
Average Annual Return, Percent [1] 6.78% 5.46% 12.89%  
iShares Morningstar Mid-Cap Growth ETF        
Prospectus [Line Items]        
Average Annual Return, Percent 6.75% 5.42% 12.71%  
Performance Inception Date       Jun. 28, 2004
iShares Morningstar Mid-Cap Growth ETF | After Taxes on Distributions        
Prospectus [Line Items]        
Average Annual Return, Percent 6.53% 5.21% 12.55%  
iShares Morningstar Mid-Cap Growth ETF | After Taxes on Distributions and Sales        
Prospectus [Line Items]        
Average Annual Return, Percent 4.12% 4.18% 10.63%  
[1] The Morningstar US Mid Cap Broad Growth Index (Spliced) reflects the performance of the Morningstar US Mid Growth Index through March 21, 2021 and the Morningstar US Mid Cap Broad Growth Index thereafter, which reflect the times when each index was the Underlying Index of the Fund.