Research International Core Portfolio Performance Management - Research International Core Portfolio |
Dec. 31, 2025 |
|---|---|
| Prospectus [Line Items] | |
| Bar Chart and Performance Table [Heading] | <span style="color:#000000;font-family:Arial;font-size:10.02pt;font-weight:bold;">PERFORMANCE</span> |
| Performance Narrative [Text Block] | The following bar chart illustrates the risks of investing in the Portfolio by showing how the performance of the Portfolio has varied from year to year. The table to the right of the bar chart shows the Portfolio’s average annual total return over certain time periods and compares the Portfolio’s returns with those of an index that has characteristics relevant to the Portfolio’s investment strategy (Strategy Index) and a second index that also has characteristics relevant to the Portfolio’s investment strategy and that represents the overall securities market (Broad-Based Index).Returns are based on past results and are not an indication of future performance.Neither the bar chart nor the table reflects the fees and expenses separately charged by the variable annuity contract or variable life insurance policy separate account that invests in the Portfolio and returns would be lower if those fees and expenses were reflected. |
| Performance Past Does Not Indicate Future [Text] | <span style="font-family:Times New Roman;font-size:10.02pt;">Returns are based on past results and are not an indication of future performance.</span> |
| Performance Information Illustrates Variability of Returns [Text] | <span style="font-family:Times New Roman;font-size:10.02pt;margin-left:0%;">The following bar chart illustrates the risks of investing in the Portfolio by showing how the performance of the Portfolio has varied from year to year. The table to the right of the bar chart shows the Portfolio’s average annual total return over certain time periods and compares the Portfolio’s returns with those of an index that </span><span style="font-family:Times New Roman;font-size:10.02pt;">has characteristics relevant to the Portfolio’s investment strategy </span><span style="font-family:Times New Roman;font-size:10.02pt;margin-left:0%;">(Strategy Index)</span><span style="font-family:Times New Roman;font-size:10.02pt;line-height:10.62pt;"> </span><span style="font-family:Times New Roman;font-size:10.02pt;">and a second index that also has characteristics relevant to the Portfolio’s investment strategy and that represents </span><span style="font-family:Times New Roman;font-size:10.02pt;margin-left:0%;">the overall securities market (Broad-Based Index)</span><span style="font-family:Times New Roman;font-size:10.02pt;">.</span> |
| Bar Chart Does Not Reflect Sales Loads [Text] | <span style="font-family:Times New Roman;font-size:10.02pt;margin-left:0%;">Neither the bar chart nor the table reflects the fees and expenses separately charged by the variable annuity contract or variable life </span><span style="font-family:Times New Roman;font-size:10.02pt;">insurance policy separate account that invests in the Portfolio and returns would be lower if those fees and expenses were reflected.</span> |
| Bar Chart Closing [Text Block] | Quarter/YearReturnBest Quarter2nd quarter, 202016.69%Worst Quarter1st quarter, 2020-19.69% |
| Performance Table Heading | <span style="font-family:Times New Roman;font-size:10.02pt;font-weight:bold;">Average Annual Total Return </span> <br/><span style="font-family:Times New Roman;font-size:10.02pt;font-weight:bold;">(for periods ended December 31, 2025)</span> |
| Research International Core Portfolio | |
| Prospectus [Line Items] | |
| Highest Quarterly Return, Label [Optional Text] | <span style="color:#000000;font-family:Times New Roman;font-size:9.02pt;margin-left:0.0pt;">Best Quarter</span> |
| Highest Quarterly Return | 16.69% |
| Highest Quarterly Return, Date | Jun. 30, 2020 |
| Lowest Quarterly Return, Label [Optional Text] | <span style="color:#000000;font-family:Times New Roman;font-size:9.02pt;margin-left:0.0pt;">Worst Quarter</span> |
| Lowest Quarterly Return | (19.69%) |
| Lowest Quarterly Return, Date | Mar. 31, 2020 |