Real Estate Index Portfolio Annual Total Returns |
12 Months Ended | |||||||
|---|---|---|---|---|---|---|---|---|
Dec. 31, 2025 |
Dec. 31, 2024 |
Dec. 31, 2023 |
Dec. 31, 2022 |
Dec. 31, 2021 |
Dec. 31, 2020 |
Dec. 31, 2019 |
Dec. 31, 2018 |
|
| Portfolio [Member] | Real Estate Index Portfolio | Real Estate Index Portfolio | ||||||||
| Prospectus [Line Items] | ||||||||
| Annual Return [Percent] | 3.11% | 4.74% | 11.70% | (26.30%) | 40.21% | (4.85%) | 28.81% | (5.35%) |