S000004439 [Member] Average Annual Total Returns |
12 Months Ended | 60 Months Ended | 120 Months Ended | 245 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 Microcap Index (Returns do not reflect deductions for fees, expenses or taxes) | ||||
| Prospectus [Line Items] | ||||
| Average Annual Return, Percent | 22.98% | 7.32% | 9.58% | |
| iShares Micro-Cap ETF | ||||
| Prospectus [Line Items] | ||||
| Average Annual Return, Percent | 22.80% | 7.07% | 9.40% | |
| Performance Inception Date | Aug. 12, 2005 | |||
| iShares Micro-Cap ETF | After Taxes on Distributions | ||||
| Prospectus [Line Items] | ||||
| Average Annual Return, Percent | 22.38% | 6.75% | 9.05% | |
| iShares Micro-Cap ETF | After Taxes on Distributions and Sales | ||||
| Prospectus [Line Items] | ||||
| Average Annual Return, Percent | 13.64% | 5.45% | 7.60% |