Condensed Consolidated Statements of Changes in Equity - USD ($) $ in Millions	Total	Additional Paid-in Capital [Member]		Retained Earnings [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Treasury Stock Common [Member]	Total BlackRock Stockholders' Equity [Member]	Nonredeemable Noncontrolling Interests [Member]	Redeemable Noncontrolling Interests / Temporary Equity [Member]
Balance at Dec. 31, 2022	$ 37,876	$ 19,774	[1]	$ 29,876	$ (1,101)	$ (10,805)	$ 37,744	$ 132	$ 909
Net income	4,150	0	[1]	4,127	0	0	4,127	23	37
Dividends declared	(2,292)	0	[1]	(2,292)	0	0	(2,292)	0	0
Stock-based compensation	469	469	[1]	0	0	0	469	0	0
Issuance of common shares related to employee stock transactions	79	(554)	[1]	0	0	633	79	0	0
Employee tax withholdings related to employee stock transactions	(369)	0	[1]	0	0	(369)	(369)	0	0
Shares repurchased	(1,131)	0	[1]	0	0	(1,131)	(1,131)	0	0
Subscriptions (redemptions/distributions) — noncontrolling interest holders	(21)	0	[1]	0	0	0	0	(21)	1,053
Net consolidations (deconsolidations) of sponsored investment funds	19	0	[1]	0	0	0	0	19	(148)
Other comprehensive income (loss)	0	0	[1]	0	0	0	0	0	0
Balance Ending at Sep. 30, 2023	38,780	19,689	[1],[2]	31,711	(1,101)	(11,672)	38,627	153	1,851
Balance at Jun. 30, 2023	38,350	19,573	[2]	30,855	(880)	(11,340)	38,208	142	1,546
Net income	1,607	0	[2]	1,604	0	0	1,604	3	(12)
Dividends declared	(748)	0	[2]	(748)	0	0	(748)	0	0
Stock-based compensation	146	146	[2]	0	0	0	146	0	0
Issuance of common shares related to employee stock transactions	32	(30)	[2]	0	0	62	32	0	0
Employee tax withholdings related to employee stock transactions	(15)	0	[2]	0	0	(15)	(15)	0	0
Shares repurchased	(379)	0	[2]	0	0	(379)	(379)	0	0
Subscriptions (redemptions/distributions) — noncontrolling interest holders	(11)	0	[2]	0	0	0	0	(11)	403
Net consolidations (deconsolidations) of sponsored investment funds	19	0	[2]	0	0	0	0	19	(86)
Other comprehensive income (loss)	(221)	0	[2]	0	(221)	0	(221)	0	0
Balance Ending at Sep. 30, 2023	38,780	19,689	[1],[2]	31,711	(1,101)	(11,672)	38,627	153	1,851
Balance at Dec. 31, 2023	39,500	19,835	[3]	32,343	(840)	(11,991)	39,347	153	1,740
Net income	4,683	0	[3]	4,699	0	0	4,699	(16)	168
Dividends declared	(2,310)	0	[3]	(2,310)	0	0	(2,310)	0	0
Stock-based compensation	511	511	[3]	0	0	0	511	0	0
Issuance of common shares related to employee stock transactions	267	(439)	[3]	0	0	706	267	0	0
Employee tax withholdings related to employee stock transactions	(294)	0	[3]	0	0	(294)	(294)	0	0
Shares repurchased	(1,250)	0	[3]	0	0	(1,250)	(1,250)	0	0
Subscriptions (redemptions/distributions) — noncontrolling interest holders	35	0	[3]	0	0	0	0	35	1,956
Net consolidations (deconsolidations) of sponsored investment funds	0	0	[3]	0	0	0	0	0	(1,590)
Other comprehensive income (loss)	208	0	[3]	0	208	0	208	0	0
Balance Ending at Sep. 30, 2024	41,350	19,907	[3],[4]	34,732	(632)	(12,829)	41,178	172	2,274
Balance at Jun. 30, 2024	40,271	19,773	[4]	33,858	(978)	(12,551)	40,102	169	1,968
Net income	1,622	0	[4]	1,631	0	0	1,631	(9)	69
Dividends declared	(757)	0	[4]	(757)	0	0	(757)	0	0
Stock-based compensation	156	156	[4]	0	0	0	156	0	0
Issuance of common shares related to employee stock transactions	91	(22)	[4]	0	0	113	91	0	0
Employee tax withholdings related to employee stock transactions	(16)	0	[4]	0	0	(16)	(16)	0	0
Shares repurchased	(375)	0	[4]	0	0	(375)	(375)	0	0
Subscriptions (redemptions/distributions) — noncontrolling interest holders	12	0	[4]	0	0	0	0	12	1,024
Net consolidations (deconsolidations) of sponsored investment funds	0	0	[4]	0	0	0	0	0	(787)
Other comprehensive income (loss)	346	0	[4]	0	346	0	346	0	0
Balance Ending at Sep. 30, 2024	$ 41,350	$ 19,907	[3],[4]	$ 34,732	$ (632)	$ (12,829)	$ 41,178	$ 172	$ 2,274

[1] Amounts include $2 million of common stock at both September 30, 2023 and December 31, 2022.

[2] Amounts include $2 million of common stock at both September 30, 2023 and June 30, 2023.

[3] Amounts include $2 million of common stock at both September 30, 2024 and December 31, 2023.

[4] Amounts include $2 million of common stock at both September 30, 2024 and June 30, 2024.