Vanguard Federal Money Market Fund Annual Total Returns |
12 Months Ended | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|
Dec. 31, 2024 |
Dec. 31, 2023 |
Dec. 31, 2022 |
Dec. 31, 2021 |
Dec. 31, 2020 |
Dec. 31, 2019 |
Dec. 31, 2018 |
Dec. 31, 2017 |
Dec. 31, 2016 |
Dec. 31, 2015 |
|
| Retail Prospectus [Member] | Vanguard Federal Money Market Fund | Investor Shares | ||||||||||
| Prospectus [Line Items] | ||||||||||
| Annual Return [Percent] | 5.23% | 5.09% | 1.55% | 0.01% | 0.45% | 2.14% | 1.78% | 0.81% | 0.30% | 0.04% |