v3.25.2
Investor A, C, Institutional and Class R [Member] Expense Example - Investor A, C, Institutional and Class R [Member] - BLACKROCK HEALTH SCIENCES OPPORTUNITIES PORTFOLIO
May 31, 2025
USD ($)
INSTITUTIONAL  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year $ 86
Expense Example, with Redemption, 3 Years 268
Expense Example, with Redemption, 5 Years 466
Expense Example, with Redemption, 10 Years 1,037
INVESTOR A  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year 630
Expense Example, with Redemption, 3 Years 853
Expense Example, with Redemption, 5 Years 1,094
Expense Example, with Redemption, 10 Years 1,784
INVESTOR C  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year 288
Expense Example, with Redemption, 3 Years 582
Expense Example, with Redemption, 5 Years 1,001
Expense Example, with Redemption, 10 Years 1,970
Class R Shares  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year 147
Expense Example, with Redemption, 3 Years 458
Expense Example, with Redemption, 5 Years 791
Expense Example, with Redemption, 10 Years $ 1,734