Shareholder Report |
6 Months Ended | |||
---|---|---|---|---|
Jun. 30, 2025
USD ($)
Holding
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Shareholder Report [Line Items] | ||||
Document Type | N-CSRS | |||
Amendment Flag | false | |||
Registrant Name | Vanguard Bond Index Funds | |||
Entity Central Index Key | 0000794105 | |||
Entity Investment Company Type | N-1A | |||
Document Period End Date | Jun. 30, 2025 | |||
C000226472 | ||||
Shareholder Report [Line Items] | ||||
Fund Name | Ultra-Short Bond ETF | |||
Class Name | ETF Shares | |||
Trading Symbol | VUSB | |||
Security Exchange Name | CboeBZX | |||
Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains important information about Vanguard Ultra-Short Bond ETF (the "Fund") for the period of January 1, 2025, to June 30, 2025. | |||
Shareholder Report Annual or Semi-Annual | Semi-Annual Shareholder Report | |||
Additional Information [Text Block] | You can find additional information about the Fund at https://personal1.vanguard.com/ngf-next-gen-form-webapp/fund-literature. You can also request this information by contacting us at 800-662-7447. | |||
Additional Information Phone Number | 800-662-7447 | |||
Additional Information Website | https://personal1.vanguard.com/ngf-next-gen-form-webapp/fund-literature | |||
Expenses [Text Block] | What were the Fund costs for the last six months?(based on a hypothetical $10,000 investment) |
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Expenses Paid, Amount | $ 5 | |||
Expense Ratio, Percent | 0.10% | [1] | ||
AssetsNet | $ 5,356,000,000 | |||
Holdings Count | Holding | 1,016 | |||
InvestmentCompanyPortfolioTurnover | 39.00% | |||
Additional Fund Statistics [Text Block] | Fund Statistics (as of June 30, 2025) |
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Holdings [Text Block] | Portfolio Composition % of Net Assets (as of June 30, 2025)This table reflects the Fund's investments, including short-term investments, derivatives and other assets and liabilities. |
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Material Fund Change [Text Block] | ||||
Updated Prospectus Phone Number | 800-662-7447 | |||
Updated Prospectus Web Address | https://personal1.vanguard.com/ngf-next-gen-form-webapp/fund-literature | |||
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