S000013702 [Member] Expense Example - iShares MBS ETF - iShares MBS ETF	Feb. 28, 2025 USD ($)
Prospectus [Line Items]
Expense Example, with Redemption, 1 Year	$ 4
Expense Example, with Redemption, 3 Years	13
Expense Example, with Redemption, 5 Years	23
Expense Example, with Redemption, 10 Years	$ 51

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