Vanguard Long-Term Treasury Fund Expense Example - Retail Prospectus [Member] - Vanguard Long-Term Treasury Fund |
Jan. 31, 2026
USD ($)
|
|---|---|
| Investor Shares | |
| Prospectus [Line Items] | |
| Expense Example, with Redemption, 1 Year | $ 20 |
| Expense Example, with Redemption, 3 Years | 64 |
| Expense Example, with Redemption, 5 Years | 113 |
| Expense Example, with Redemption, 10 Years | 255 |
| Admiral Shares | |
| Prospectus [Line Items] | |
| Expense Example, with Redemption, 1 Year | 10 |
| Expense Example, with Redemption, 3 Years | 32 |
| Expense Example, with Redemption, 5 Years | 56 |
| Expense Example, with Redemption, 10 Years | $ 128 |