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Consolidated Sponsored Investment Products - Consolidated VIEs And VREs Recorded in Consolidated Statements of Financial Condition (Detail) - USD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Consolidated Sponsored Investment Funds [Line Items]    
Cash and cash equivalents [1] $ 4,829 $ 6,488
Investments:    
Trading debt securities 1,249 1,660
Equity securities 1,926 1,021
Bank loans 204 84
Total investments [1] 5,489 4,476
Other assets [1] 3,169 3,004
Other liabilities [1] (3,470) (3,263)
Noncontrolling interests (66) (59)
Consolidated Variable Interest Entities [Member]    
Consolidated Sponsored Investment Funds [Line Items]    
Cash and cash equivalents 131 186
Investments:    
Trading debt securities 1,059 1,395
Bank loans 204 84
Other investments 194 263
Carried interest 514 369
Total investments 3,301 2,680
Other assets 68 876
Other liabilities (820) (1,374)
Noncontrolling interests (1,348) (1,076)
BlackRock's net interest in consolidated investment products 1,332 1,292
Consolidated Voting Rights Entities [Member]    
Consolidated Sponsored Investment Funds [Line Items]    
Cash and cash equivalents 10 59
Investments:    
Trading debt securities 151 233
Total investments 483 524
Other assets 5 8
Other liabilities (20) (53)
Noncontrolling interests (34) (90)
BlackRock's net interest in consolidated investment products 444 448
Consolidated Sponsored Investment Products [Member]    
Consolidated Sponsored Investment Funds [Line Items]    
Cash and cash equivalents 141 245
Investments:    
Trading debt securities 1,210 1,628
Bank loans 204 84
Other investments 194 263
Carried interest 514 369
Total investments 3,784 3,204
Other assets 73 884
Other liabilities (840) (1,427)
Noncontrolling interests (1,382) (1,166)
BlackRock's net interest in consolidated investment products 1,776 1,740
Equity securities [Member]    
Investments:    
Equity securities 1,903 987
Equity securities [Member] | Consolidated Variable Interest Entities [Member]    
Investments:    
Equity securities 1,330 569
Equity securities [Member] | Consolidated Voting Rights Entities [Member]    
Investments:    
Equity securities 332 291
Equity securities [Member] | Consolidated Sponsored Investment Products [Member]    
Investments:    
Equity securities $ 1,662 $ 860
[1] For 2019, cash and cash equivalents, investments, other assets and other liabilities include $131 million, $3,301 million, $68 million, and $820 million, respectively, related to consolidated variable interest entities (“VIEs”). For 2018, cash and cash equivalents, investments, other assets and other liabilities include $186 million, $2,680 million, $876 million, and $1,374 million, respectively, related to consolidated VIEs