Short-Term Investment-Grade 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] | Short-Term Investment-Grade Portfolio | Short-Term Investment-Grade Portfolio | ||||||||
| Prospectus [Line Items] | ||||||||
| Annual Return [Percent] | 6.85% | 4.89% | 6.16% | (5.72%) | (0.45%) | 5.49% | 5.69% | 0.94% |