Consolidated Sponsored Investment Products - Consolidated VIEs And VREs Recorded in Consolidated Statements of Financial Condition (Detail) - USD ($) $ in Millions		Mar. 31, 2025	Dec. 31, 2024
Consolidated Sponsored Investment Funds [Line Items]
Cash and cash equivalents	[1]	$ 7,747	$ 12,762
Investments:
Trading securities		1,964	1,823
Equity securities		2,208	1,950
Total investments	[1]	10,525	9,769
Other assets	[1]	7,143	3,596
Other liabilities	[1]	(7,198)	(4,032)
Noncontrolling interests - CIPs		(170)	(169)
Consolidated Variable Interest Entities [Member]
Consolidated Sponsored Investment Funds [Line Items]
Cash and cash equivalents		282	125
Investments:
Trading securities		1,535	1,497
Equity securities		1,382	1,179
Loans		115	141
Other investments		581	370
Carried interest		1,916	1,905
Total investments		5,529	5,092
Other assets		77	45
Other liabilities		(2,145)	(2,130)
Noncontrolling interests - CIPs		(1,939)	(1,672)
BlackRock's net interests in CIPs		1,804	1,460
Consolidated Voting Rights Entities [Member]
Consolidated Sponsored Investment Funds [Line Items]
Cash and cash equivalents		58	44
Investments:
Trading securities		349	246
Equity securities		355	377
Loans		4	4
Other investments		34	33
Carried interest		0	0
Total investments		742	660
Other assets		37	31
Other liabilities		(78)	(93)
Noncontrolling interests - CIPs		(158)	(130)
BlackRock's net interests in CIPs		601	512
Consolidated Sponsored Investment Products [Member]
Consolidated Sponsored Investment Funds [Line Items]
Cash and cash equivalents		340	169
Investments:
Trading securities		1,884	1,743
Equity securities		1,737	1,556
Loans		119	145
Other investments		615	403
Carried interest		1,916	1,905
Total investments		6,271	5,752
Other assets		114	76
Other liabilities		(2,223)	(2,223)
Noncontrolling interests - CIPs		(2,097)	(1,802)
BlackRock's net interests in CIPs		2,405	1,972
Equity Securities [Member]
Investments:
Equity securities		$ 2,208	$ 1,950

[1] At March 31, 2025, cash and cash equivalents, investments, other assets and other liabilities include $282 million, $5.5 billion, $77 million and $2.1 billion, respectively, related to consolidated variable interest entities (“VIEs”). At December 31, 2024, cash and cash equivalents, investments, other assets and other liabilities include $125 million, $5.1 billion, $45 million and $2.1 billion, respectively, related to consolidated VIEs.