Vanguard California Municipal Money Market 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 |
|
| Retail Prospectus [Member] | Vanguard California Municipal Money Market Fund | Investor Shares | ||||||||
| Prospectus [Line Items] | ||||||||
| Annual Return [Percent] | 2.17% | 2.81% | 2.58% | 0.93% | 0.01% | 0.39% | 1.24% | 1.22% |