EQUITY INDEX 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 |
Dec. 31, 2017 |
Dec. 31, 2016 |
|
| EQUITY INDEX FUND | Investor | ||||||||||
| Prospectus [Line Items] | ||||||||||
| Annual Return [Percent] | 16.78% | 24.53% | 26.16% | (18.91%) | 27.95% | 17.89% | 31.33% | (4.55%) | 21.65% | 11.84% |