Global Bond 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] | Global Bond Index Portfolio | Global Bond Index Portfolio | ||||||||
| Prospectus [Line Items] | ||||||||
| Annual Return [Percent] | 5.69% | 2.03% | 6.52% | (13.13%) | (1.84%) | 6.67% | 8.41% | 0.78% |