Vanguard Utilities Index Fund Expense Example - ETF Prospectus [Member] - Vanguard Utilities Index Fund - ETF Shares	Aug. 31, 2025 USD ($)
Prospectus [Line Items]
Expense Example, with Redemption, 1 Year	$ 9
Expense Example, with Redemption, 3 Years	29
Expense Example, with Redemption, 5 Years	51
Expense Example, with Redemption, 10 Years	$ 115

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