S000004332 [Member] Average Annual Total Returns |
12 Months Ended | 60 Months Ended | 120 Months Ended | 295 Months Ended | ||
|---|---|---|---|---|---|---|
Dec. 31, 2024 |
Dec. 31, 2024 |
Dec. 31, 2024 |
Dec. 31, 2024 |
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| Russell 3000 Index (Returns do not reflect deductions for fees, expenses or taxes) | ||||||
| Prospectus [Line Items] | ||||||
| Average Annual Return, Percent | 23.81% | 13.86% | 12.55% | |||
| Russell 1000 Utilities RIC 22.5/45 Capped Index (Spliced) (Returns do not reflect deductions for fees, expenses or taxes) | ||||||
| Prospectus [Line Items] | ||||||
| Average Annual Return, Percent | [1] | 23.73% | 6.67% | 8.50% | ||
| iShares U.S. Utilities ETF | ||||||
| Prospectus [Line Items] | ||||||
| Average Annual Return, Percent | 23.24% | 6.26% | 8.06% | |||
| Performance Inception Date | Jun. 12, 2000 | |||||
| iShares U.S. Utilities ETF | After Taxes on Distributions | ||||||
| Prospectus [Line Items] | ||||||
| Average Annual Return, Percent | 22.55% | 5.59% | 7.31% | |||
| iShares U.S. Utilities ETF | After Taxes on Distributions and Sales | ||||||
| Prospectus [Line Items] | ||||||
| Average Annual Return, Percent | 14.21% | 4.79% | 6.37% | |||
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