S000019341 [Member] Average Annual Total Returns |
12 Months Ended | 60 Months Ended | 120 Months Ended | 207 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% | 1.05% | 2.13% | ||||
| ICE AMT-Free California Municipal Index (Returns do not reflect deductions for fees, expenses or taxes) | ||||||||
| Prospectus [Line Items] | ||||||||
| Average Annual Return, Percent | [2] | 1.33% | 0.90% | 2.12% | ||||
| iShares California Muni Bond ETF | ||||||||
| Prospectus [Line Items] | ||||||||
| Average Annual Return, Percent | 1.25% | 0.69% | 1.90% | |||||
| Performance Inception Date | Oct. 04, 2007 | |||||||
| iShares California Muni Bond ETF | After Taxes on Distributions | ||||||||
| Prospectus [Line Items] | ||||||||
| Average Annual Return, Percent | 1.24% | 0.68% | 1.89% | |||||
| iShares California Muni Bond ETF | After Taxes on Distributions and Sales | ||||||||
| Prospectus [Line Items] | ||||||||
| Average Annual Return, Percent | 1.87% | 1.01% | 1.96% | |||||
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