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Fair value portion of investments accounted under the equity method.

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Investments - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022	Dec. 31, 2022
Debt and Equity Securities, FV-NI [Line Items]
Investments in credit funds measured at NAV	$ 76,307		$ 76,307		$ 78,201
Gross unrealized gain included in accumulated other comprehensive gain/(loss)			0		0
Gross unrealized loss included in accumulated other comprehensive gain/(loss)			2,570		3,520
Net unrealized losses included in other comprehensive income/(loss before tax	431	$ (836)	945	$ (3,230)
Net unrealized losses included in other comprehensive income/(loss) after tax	317	(615)	720	(2,410)
Held-to-maturity securities, gross unrealized losses	2,000		2,000		1,440
Equity securities
Debt and Equity Securities, FV-NI [Line Items]
Equity method investment	5,060		5,060		5,350
Fair value option
Debt and Equity Securities, FV-NI [Line Items]
Gains/(losses) recognized on equity securities	(179)	$ (118)	(591)	$ (189)
Investments in funds at NAV
Debt and Equity Securities, FV-NI [Line Items]
Investments in funds at NAV	1,220		1,220		1,300
Investments in credit funds measured at NAV	$ 1,820		$ 1,820		$ 1,640