Investor A C Institutional And Class R [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 |
|
| Investor A, C, Institutional and Class R | BLACKROCK MID CAP GROWTH EQUITY PORTFOLIO | INVESTOR A | ||||||||||
| Prospectus [Line Items] | ||||||||||
| Annual Return [Percent] | 0.15% | 12.18% | 27.93% | (37.52%) | 14.19% | 45.73% | 35.89% | 2.56% | 34.20% | 2.78% |