Core Bond Class [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 |
|
| Core Bond Class | AB Core Bond Portfolio | Core Bond Class | ||||||||||
| Prospectus [Line Items] | ||||||||||
| Annual Return [Percent] | 7.16% | 1.25% | 5.45% | (13.73%) | (1.05%) | 7.15% | 8.66% | (0.35%) | 3.82% | 4.15% |