Vanguard Total Bond Market II 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 |
|
| Investor Prospectus [Member] | Vanguard Total Bond Market II Index Fund | Investor Shares | ||||||||
| Prospectus [Line Items] | ||||||||
| Annual Return [Percent] | 7.09% | 1.24% | 5.58% | (13.19%) | (1.73%) | 7.31% | 8.62% | (0.10%) |