|Vanguard Bond Index Funds - Vanguard Total Bond Market ETF|
|The investment seeks the performance of a broad, market-weighted bond index.
The fund employs an indexing investment approach designed to track the performance of the Barclays U.S. Aggregate Float Adjusted Index. This index represents a wide spectrum of public, investment-grade, taxable, fixed income securities in the United States-including government, corporate, and international dollar-denominated bonds, as well as mortgage-backed and asset-backed securities-all with maturities of more than 1 year. All of the fund's investments will be selected through the sampling process, and at least 80% of the fund's assets will be invested in bonds held in the index.|
| ||BND||Category Avg|
|Annual Report Expense Ratio (net)||0.06%||N/A|
|Annual Holdings Turnover||84.00%||N/A|
|Total Net Assets||NaN||N/A|