Condensed Consolidated Statements of Income - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Revenue
Total revenue	$ 5,197	$ 4,522	$ 14,730	$ 13,228
Expense
Employee compensation and benefits	1,578	1,420	4,661	4,276
Distribution and servicing costs	549	526	1,606	1,549
Direct fund expense	379	354	1,075	1,013
Sub-advisory and other	34	28	98	81
Total Sales, Asset and Account Expense, Total	962	908	2,779	2,643
General and administration expense	562	518	1,625	1,506
Amortization and impairment of intangible assets	89	39	166	113
Total expense	3,191	2,885	9,231	8,538
Operating income	2,006	1,637	5,499	4,690
Nonoperating income (expense)
Net gain (loss) on investments	177	114	510	434
Interest and dividend income	236	139	555	314
Interest expense	(154)	(82)	(372)	(210)
Total nonoperating income (expense)	259	171	693	538
Income before income taxes	2,265	1,808	6,192	5,228
Income tax expense	574	213	1,341	1,041
Net income	1,691	1,595	4,851	4,187
Net income (loss) attributable to noncontrolling interests	60	(9)	152	60
Net income attributable to BlackRock, Inc.	$ 1,631	$ 1,604	$ 4,699	$ 4,127
Earnings per share attributable to BlackRock, Inc. common stockholders:
Basic	$ 11.02	$ 10.75	$ 31.67	$ 27.6
Diluted	$ 10.9	$ 10.66	$ 31.37	$ 27.36
Weighted-average common shares outstanding:
Basic	148,049,700	149,155,258	148,392,684	149,553,652
Diluted	149,608,575	150,505,143	149,795,958	150,862,023
Investment Advisory, Administration Fees and Securities Lending Revenue [Member]
Revenue
Total revenue	$ 4,030	$ 3,681	$ 11,683	$ 10,794
Investment Advisory, Administration Fees and Securities Lending Revenue [Member] | Related Parties [Member]
Revenue
Total revenue	3,064	2,765	8,846	8,065
Investment Advisory, Administration Fees and Securities Lending Revenue [Member] | Other Third Parties [Member]
Revenue
Total revenue	966	916	2,837	2,729
Investment Advisory Performance Fees [Member]
Revenue
Total revenue	388	70	756	243
Technology Services Revenue [Member]
Revenue
Total revenue	403	407	1,175	1,106
Distribution Fees [Member]
Revenue
Total revenue	323	321	951	959
Advisory and Other Revenue [Member]
Revenue
Total revenue	$ 53	$ 43	$ 165	$ 126