S000001259 [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 |
|
| LIMITED TERM U.S. GOVERNMENT FUND | LIMITED TERM U.S. GOVERNMENT FUND | ||||||||||
| Prospectus [Line Items] | ||||||||||
| Annual Return [Percent] | 5.63% | 2.96% | 4.00% | (5.70%) | (1.67%) | 3.82% | 4.23% | 0.45% | 0.38% | 0.44% |