S000018861 [Member] Expense Example - iShares National Muni Bond ETF - iShares National Muni Bond ETF	Feb. 28, 2025 USD ($)
Prospectus [Line Items]
Expense Example, with Redemption, 1 Year	$ 5
Expense Example, with Redemption, 3 Years	16
Expense Example, with Redemption, 5 Years	28
Expense Example, with Redemption, 10 Years	$ 64

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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