S000001252 [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 |
|
| FIXED INCOME FUND | FIXED INCOME FUND | ||||||||||
| Prospectus [Line Items] | ||||||||||
| Annual Return [Percent] | 7.64% | 1.79% | 6.00% | (13.86%) | (0.18%) | 7.98% | 10.72% | (2.14%) | 4.13% | 3.22% |