S000023507 [Member] Average Annual Total Returns |
12 Months Ended | 60 Months Ended | 120 Months Ended | 194 Months Ended | ||||
|---|---|---|---|---|---|---|---|---|
Dec. 31, 2024 |
Dec. 31, 2024 |
Dec. 31, 2024 |
Dec. 31, 2024 |
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| ICE Short Maturity AMT-Free US National Municipal Index (Returns do not reflect deductions for fees, expenses or taxes) | ||||||||
| Prospectus [Line Items] | ||||||||
| Average Annual Return, Percent | [1] | 2.19% | 1.18% | 1.34% | ||||
| ICE AMT-Free US National Municipal Index (Returns do not reflect deductions for fees, expenses or taxes) | ||||||||
| Prospectus [Line Items] | ||||||||
| Average Annual Return, Percent | [2] | 1.23% | 1.05% | 2.13% | ||||
| iShares Short-Term National Muni Bond ETF | ||||||||
| Prospectus [Line Items] | ||||||||
| Average Annual Return, Percent | 2.03% | 1.07% | 1.15% | |||||
| Performance Inception Date | Nov. 05, 2008 | |||||||
| iShares Short-Term National Muni Bond ETF | After Taxes on Distributions | ||||||||
| Prospectus [Line Items] | ||||||||
| Average Annual Return, Percent | 2.03% | 1.07% | 1.15% | |||||
| iShares Short-Term National Muni Bond ETF | After Taxes on Distributions and Sales | ||||||||
| Prospectus [Line Items] | ||||||||
| Average Annual Return, Percent | 2.07% | 1.13% | 1.16% | |||||
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