Service and Premier Shares [Member] 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 |
Dec. 31, 2017 |
Dec. 31, 2016 |
|
| Service and Premier Shares [Member] | U.S. GOVERNMENT SELECT PORTFOLIO | Service Shares | ||||||||||
| Prospectus [Line Items] | ||||||||||
| Annual Return [Percent] | 4.20% | 5.15% | 4.99% | 1.29% | 0.03% | 0.40% | 2.08% | 1.68% | 0.72% | 0.23% |