Other Assets - Carrying Value of Goodwill (Detail) - USD ($) $ in Millions	Sep. 30, 2022	Dec. 31, 2021
Schedule Of Intangible Assets And Goodwill [Line Items]
Goodwill	$ 6,288	$ 4,285
Investment Banking
Schedule Of Intangible Assets And Goodwill [Line Items]
Goodwill	281	281
FICC
Schedule Of Intangible Assets And Goodwill [Line Items]
Goodwill	269	269
Equities
Schedule Of Intangible Assets And Goodwill [Line Items]
Goodwill	2,637	2,638
Asset Management
Schedule Of Intangible Assets And Goodwill [Line Items]
Goodwill	1,299	349
Consumer banking
Schedule Of Intangible Assets And Goodwill [Line Items]
Goodwill	1,102	48
Wealth management
Schedule Of Intangible Assets And Goodwill [Line Items]
Goodwill	$ 700	$ 700