Index 400 Stock Portfolio 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 |
|
| Index 400 Stock Portfolio | Index 400 Stock Portfolio | ||||||||||
| Prospectus [Line Items] | ||||||||||
| Annual Return [Percent] | 7.24% | 13.63% | 16.15% | (13.26%) | 24.46% | 13.37% | 25.88% | (11.33%) | 15.96% | 20.38% |