v3.24.2.u1
Variable Interest Entities Reflects adoption of ASU 2015-12 - Balances Relating to Variable Interest Entities in which BlackRock is Not Primary Beneficiary (Detail) - Variable Interest Entity, Not Primary Beneficiary [Member] - USD ($)
$ in Millions
Jun. 30, 2024
Dec. 31, 2023
Investments [Member]    
Variable Interest Entity [Line Items]    
Sponsored investment products $ 2,261 $ 2,377
Advisory Fee Receivables [Member]    
Variable Interest Entity [Line Items]    
Sponsored investment products 149 116
Other Net Assets (Liabilities) [Member]    
Variable Interest Entity [Line Items]    
Sponsored investment products (9) (11)
Maximum Risk of Loss [Member]    
Variable Interest Entity [Line Items]    
Sponsored investment products $ 2,427 $ 2,510