Vanguard Long-Term Bond Index Fund Expense Example - Admiral Prospectus [Member] - Vanguard Long-Term Bond Index Fund - Admiral Shares	Dec. 31, 2025 USD ($)
Prospectus [Line Items]
Expense Example, with Redemption, 1 Year	$ 56
Expense Example, with Redemption, 3 Years	69
Expense Example, with Redemption, 5 Years	84
Expense Example, with Redemption, 10 Years	$ 127

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