Vanguard Total Bond Market Index Fund Annual Total Returns |
12 Months Ended | |||||||
|---|---|---|---|---|---|---|---|---|
Dec. 31, 2025 |
Dec. 31, 2024 |
Dec. 31, 2023 |
Dec. 31, 2022 |
Dec. 31, 2021 |
Dec. 31, 2020 |
Dec. 31, 2019 |
Dec. 31, 2018 |
|
| Institutional Prospectus [Member] | Vanguard Total Bond Market Index Fund | Institutional Shares | ||||||||
| Prospectus [Line Items] | ||||||||
| Annual Return [Percent] | 7.17% | 1.25% | 5.72% | (13.15%) | (1.65%) | 7.74% | 8.73% | (0.01%) |