High Yield Bond 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 |
|
| Portfolio [Member] | High Yield Bond Portfolio | High Yield Bond Portfolio | ||||||||
| Prospectus [Line Items] | ||||||||
| Annual Return [Percent] | 9.18% | 6.30% | 11.66% | (9.23%) | 3.68% | 5.67% | 15.67% | (2.73%) |