Short-Term 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 |
Dec. 31, 2017 |
Dec. 31, 2016 |
|
| Short-Term Bond Portfolio | Short-Term Bond Portfolio | ||||||||||
| Prospectus [Line Items] | ||||||||||
| Annual Return [Percent] | 5.70% | 5.04% | 5.26% | (4.52%) | (0.10%) | 4.29% | 4.38% | 1.36% | 1.33% | 1.67% |