Stock 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 |
|
| Stock Index Fund | None | ||||||||||
| Prospectus [Line Items] | ||||||||||
| Annual Return [Percent] | 17.55% | 24.66% | 25.80% | (18.33%) | 28.35% | 17.99% | 31.09% | (4.72%) | 21.41% | 11.60% |