Other Assets - Identifiable Intangible Assets by Reporting Unit and Type (Detail) - USD ($) $ in Millions	Sep. 30, 2022	Dec. 31, 2021
Finite-Lived Intangible Assets [Line Items]
Gross carrying value	$ 3,613	$ 1,960
Accumulated amortization	(1,650)	(1,542)
Net carrying value	1,963	418
Customer lists and merchant relationships
Finite-Lived Intangible Assets [Line Items]
Gross carrying value	3,126	1,460
Accumulated amortization	(1,229)	(1,130)
Net carrying value	1,897	330
Acquired leases and other
Finite-Lived Intangible Assets [Line Items]
Gross carrying value	487	500
Accumulated amortization	(421)	(412)
Net carrying value	66	88
FICC
Finite-Lived Intangible Assets [Line Items]
Net carrying value	1	1
Equities
Finite-Lived Intangible Assets [Line Items]
Net carrying value	40	43
Asset Management
Finite-Lived Intangible Assets [Line Items]
Net carrying value	938	122
Consumer banking
Finite-Lived Intangible Assets [Line Items]
Net carrying value	764	0
Wealth management
Finite-Lived Intangible Assets [Line Items]
Net carrying value	$ 220	$ 252