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 HEALTH SCIENCES OPPORTUNITIES PORTFOLIO | INVESTOR A | ||||||||||
| Prospectus [Line Items] | ||||||||||
| Annual Return [Percent] | 15.98% | 3.86% | 3.57% | (5.91%) | 11.80% | 19.47% | 25.28% | 7.97% | 24.82% | (6.05%) |