S000019341 [Member] Expense Example - iShares California Muni Bond ETF - iShares California Muni Bond ETF	Feb. 28, 2025 USD ($)
Prospectus [Line Items]
Expense Example, with Redemption, 1 Year	$ 8
Expense Example, with Redemption, 3 Years	26
Expense Example, with Redemption, 5 Years	45
Expense Example, with Redemption, 10 Years	$ 103

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