v3.26.3
Investor A C Institutional and Class R [Member] Expense Example - Investor A, C, Institutional and Class R - BLACKROCK HEALTH SCIENCES OPPORTUNITIES PORTFOLIO
May 31, 2026
USD ($)
INSTITUTIONAL  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year $ 88
Expense Example, with Redemption, 3 Years 274
Expense Example, with Redemption, 5 Years 477
Expense Example, with Redemption, 10 Years 1,061
INVESTOR A  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year 632
Expense Example, with Redemption, 3 Years 859
Expense Example, with Redemption, 5 Years 1,104
Expense Example, with Redemption, 10 Years 1,806
INVESTOR C  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year 293
Expense Example, with Redemption, 3 Years 597
Expense Example, with Redemption, 5 Years 1,026
Expense Example, with Redemption, 10 Years 2,016
Class R Shares  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year 150
Expense Example, with Redemption, 3 Years 465
Expense Example, with Redemption, 5 Years 803
Expense Example, with Redemption, 10 Years $ 1,757