S000004338 [Member] Expense Example - iShares Russell Mid-Cap ETF - iShares Russell Mid-Cap ETF	Mar. 31, 2026 USD ($)
Prospectus [Line Items]
Expense Example, with Redemption, 1 Year	$ 18
Expense Example, with Redemption, 3 Years	58
Expense Example, with Redemption, 5 Years	101
Expense Example, with Redemption, 10 Years	$ 230

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