Fair Value Measurements - Summary of Financial Assets and Liabilities Carried at Fair Value (Detail) - USD ($) $ in Millions	Sep. 30, 2023	Jun. 30, 2023	Dec. 31, 2022
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total financial assets at fair value	$ 758,400	$ 722,276	$ 650,966
Total assets	$ 1,577,153	$ 1,571,386	$ 1,441,799
Total level 3 financial assets divided by total assets	1.60%	1.70%	1.80%
Total level 3 financial assets divided by total financial assets at fair value	3.30%	3.60%	4.00%
Total financial liabilities at fair value	$ 588,532	$ 577,513	$ 447,584
Total liabilities	$ 1,459,876	$ 1,454,893	$ 1,324,610
Total level 3 financial liabilities divided by total liabilities	1.90%	1.80%	1.70%
Total level 3 financial liabilities divided by total financial liabilities at fair value	4.70%	4.50%	5.10%
Counterparty and cash collateral netting
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total financial assets at fair value	$ (59,399)	$ (55,685)	$ (57,855)
Total financial liabilities at fair value	(44,386)	(43,276)	(47,884)
Investments in funds at NAV
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total financial assets at fair value	3,037	3,063	2,941
Level 1
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total financial assets at fair value	318,535	270,334	194,698
Total financial liabilities at fair value	123,428	125,540	119,578
Level 2
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total financial assets at fair value	471,365	478,619	485,134
Total financial liabilities at fair value	481,831	469,090	353,060
Level 3
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total financial assets at fair value	24,862	25,945	26,048
Total financial liabilities at fair value	$ 27,659	$ 26,159	$ 22,830