Loomis Sayles Growth Portfolio Average Annual Total Returns |
12 Months Ended | 60 Months Ended | 120 Months Ended |
|---|---|---|---|
Dec. 31, 2025 |
Dec. 31, 2025 |
Dec. 31, 2025 |
|
| Russell 3000 Index (reflects no deduction for mutual fund fees or expenses)[Member] | |||
| Prospectus [Line Items] | |||
| Average Annual Return, Percent | 17.15% | 13.15% | 14.29% |
| Russell 1000 Growth Index (reflects no deduction for mutual fund fees or expenses)[Member] | |||
| Prospectus [Line Items] | |||
| Average Annual Return, Percent | 18.56% | 15.32% | 18.13% |
| Class A | |||
| Prospectus [Line Items] | |||
| Average Annual Return, Percent | 15.21% | 15.06% | 14.19% |
| Class B | |||
| Prospectus [Line Items] | |||
| Average Annual Return, Percent | 14.90% | 14.77% | 13.91% |
| Class E | |||
| Prospectus [Line Items] | |||
| Average Annual Return, Percent | 15.05% | 14.89% | 14.02% |