Total Bond Market Index 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] | Total Bond Market Index Portfolio | Total Bond Market Index Portfolio | ||||||||
| Prospectus [Line Items] | ||||||||
| Annual Return [Percent] | 6.94% | 1.24% | 5.58% | (13.21%) | (1.72%) | 7.58% | 8.67% | (0.21%) |