Vanguard Long-Term Bond 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 |
|
| ETF Prospectus [Member] | Vanguard Long-Term Bond Index Fund | ETF Shares | ||||||||
| Prospectus [Line Items] | ||||||||
| Annual Return [Percent] | 6.53% | (4.09%) | 7.53% | (27.20%) | (2.63%) | 16.24% | 19.09% | (4.46%) |