Annual Total Returns |
Dec. 31, 2025 |
Dec. 31, 2024 |
Dec. 31, 2023 |
Dec. 31, 2022 |
Dec. 31, 2021 |
Dec. 31, 2020 |
Dec. 31, 2019 |
Dec. 31, 2018 |
Dec. 31, 2017 |
Dec. 31, 2016 |
|---|---|---|---|---|---|---|---|---|---|---|
| Midcap Stock Portfolio | Initial Shares | ||||||||||
| Prospectus [Line Items] | ||||||||||
| Annual Return [Percent] | 10.07% | 12.61% | 18.31% | (14.08%) | 25.89% | 8.11% | 20.18% | (15.49%) | 15.38% | 15.47% |
| Small Cap Stock Index Portfolio | Service Shares | ||||||||||
| Prospectus [Line Items] | ||||||||||
| Annual Return [Percent] | 5.36% | 7.96% | 15.39% | (16.65%) | 26.14% | 10.64% | 22.21% | (8.98%) | 12.40% | 25.73% |
| Technology Growth Portfolio | Initial Shares | ||||||||||
| Prospectus [Line Items] | ||||||||||
| Annual Return [Percent] | 28.16% | 25.74% | 59.42% | (46.39%) | 12.93% | 69.92% | 25.82% | (0.98%) | 42.64% | 4.72% |