Global Bond Index Portfolio Average Annual Total Returns - Portfolio [Member] |
12 Months Ended | 60 Months Ended | 100 Months Ended | |
|---|---|---|---|---|
Dec. 31, 2025 |
Dec. 31, 2025 |
Dec. 31, 2025 |
Dec. 31, 2025 |
|
| Global Bond Composite Index in USD (reflects no deduction for fees, expenses, or taxes)[Member] | ||||
| Prospectus [Line Items] | ||||
| Average Annual Return, Percent | 5.95% | (0.28%) | 1.73% | |
| Bloomberg Global Aggregate Float Adjusted Index in USD (reflects no deduction for fees, expenses, or taxes)[Member] | ||||
| Prospectus [Line Items] | ||||
| Average Annual Return, Percent | 8.67% | (1.72%) | 0.64% | |
| Global Bond Index Portfolio | ||||
| Prospectus [Line Items] | ||||
| Average Annual Return, Percent | 5.69% | (0.41%) | 1.59% | |
| Performance Inception Date | Sep. 07, 2017 |