Services [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 |
|
| Services | BLACKROCK MID CAP GROWTH EQUITY PORTFOLIO | SERVICE | ||||||||||
| Prospectus [Line Items] | ||||||||||
| Annual Return [Percent] | 0.16% | 12.17% | 27.91% | (37.52%) | 14.22% | 45.72% | 35.90% | 2.60% | 34.40% | 2.86% |