Research International Core Portfolio Average Annual Total Returns |
12 Months Ended | 60 Months Ended | 120 Months Ended |
|---|---|---|---|
Dec. 31, 2025 |
Dec. 31, 2025 |
Dec. 31, 2025 |
|
| MSCI EAFE® Index (Net)(reflects no deduction for fees, expenses or taxes)[Member] | |||
| Prospectus [Line Items] | |||
| Average Annual Return, Percent | 31.22% | 8.92% | 8.18% |
| MSCI® All Country World (ex-US) Index (Net)(reflects no deduction for fees, expenses or taxes)[Member] | |||
| Prospectus [Line Items] | |||
| Average Annual Return, Percent | 32.39% | 7.91% | 8.41% |
| Research International Core Portfolio | |||
| Prospectus [Line Items] | |||
| Average Annual Return, Percent | 22.98% | 5.89% | 7.81% |