Vanguard Mid-Cap Growth 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 Mid-Cap Growth Index Fund | Investor Shares | ||||||||
| Prospectus [Line Items] | ||||||||
| Annual Return [Percent] | 10.55% | 16.27% | 22.99% | (28.93%) | 20.32% | 34.32% | 33.72% | (5.74%) |