S000018861 [Member] Average Annual Total Returns |
12 Months Ended | 60 Months Ended | 120 Months Ended | 208 Months Ended | ||
|---|---|---|---|---|---|---|
Dec. 31, 2024 |
Dec. 31, 2024 |
Dec. 31, 2024 |
Dec. 31, 2024 |
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| ICE AMT-Free US National Municipal Index (Returns do not reflect deductions for fees, expenses or taxes) | ||||||
| Prospectus [Line Items] | ||||||
| Average Annual Return, Percent | [1] | 1.23% | 1.07% | 2.22% | ||
| iShares National Muni Bond ETF | ||||||
| Prospectus [Line Items] | ||||||
| Average Annual Return, Percent | 1.11% | 1.00% | 2.06% | |||
| Performance Inception Date | Sep. 07, 2007 | |||||
| iShares National Muni Bond ETF | After Taxes on Distributions | ||||||
| Prospectus [Line Items] | ||||||
| Average Annual Return, Percent | 1.11% | 1.00% | 2.06% | |||
| iShares National Muni Bond ETF | After Taxes on Distributions and Sales | ||||||
| Prospectus [Line Items] | ||||||
| Average Annual Return, Percent | 1.88% | 1.31% | 2.14% | |||
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