Vanguard SP Mid-Cap 400 Index 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 |
|
| ETF Prospectus [Member] | Vanguard SP Mid-Cap 400 Index Fund | ETF Shares | ||||||||||
| Prospectus [Line Items] | ||||||||||
| Annual Return [Percent] | 13.82% | 16.34% | (13.14%) | 24.63% | 13.54% | 26.11% | (11.20%) | 16.10% | 20.56% | (2.30%) |