S000004338 [Member] Average Annual Total Returns |
12 Months Ended | 60 Months Ended | 120 Months Ended | 293 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 Midcap Index (Returns do not reflect deductions for fees, expenses or taxes) | ||||
| Prospectus [Line Items] | ||||
| Average Annual Return, Percent | 10.60% | 8.67% | 11.01% | |
| iShares Russell Mid-Cap ETF | ||||
| Prospectus [Line Items] | ||||
| Average Annual Return, Percent | 10.42% | 8.50% | 10.84% | |
| Performance Inception Date | Jul. 17, 2001 | |||
| iShares Russell Mid-Cap ETF | After Taxes on Distributions | ||||
| Prospectus [Line Items] | ||||
| Average Annual Return, Percent | 10.06% | 8.13% | 10.41% | |
| iShares Russell Mid-Cap ETF | After Taxes on Distributions and Sales | ||||
| Prospectus [Line Items] | ||||
| Average Annual Return, Percent | 6.39% | 6.64% | 8.84% |