S000001261 [Member] 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 |
Dec. 31, 2017 |
Dec. 31, 2016 |
|
| U.S. GOVERNMENT FUND | U.S. GOVERNMENT FUND | ||||||||||
| Prospectus [Line Items] | ||||||||||
| Annual Return [Percent] | 6.07% | 1.17% | 4.01% | (7.73%) | (2.39%) | 5.27% | 5.39% | 0.57% | 0.80% | 0.57% |