Derivative Instruments and Hedging Activities - Gains Losses on Freestanding Derivatives (Details) - Other non-interest income - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Derivative Instruments, Gain (Loss) [Line Items]
Gains (losses) recognized in other non-interest income:	$ 324	$ 141	$ 50
Interest rate contracts:
Derivative Instruments, Gain (Loss) [Line Items]
Gains (losses) recognized in other non-interest income:	89	103	67
Interest rate contracts: | Customer accommodation:
Derivative Instruments, Gain (Loss) [Line Items]
Gains (losses) recognized in other non-interest income:	34	40	32
Interest rate contracts: | Other interest rate exposures
Derivative Instruments, Gain (Loss) [Line Items]
Gains (losses) recognized in other non-interest income:	264	76	(5)
Commodity contracts | Customer accommodation:
Derivative Instruments, Gain (Loss) [Line Items]
Gains (losses) recognized in other non-interest income:	39	49	28
Foreign exchange and other contracts | Customer accommodation:
Derivative Instruments, Gain (Loss) [Line Items]
Gains (losses) recognized in other non-interest income:	16	14	7
Other contracts
Derivative Instruments, Gain (Loss) [Line Items]
Gains (losses) recognized in other non-interest income:	$ (29)	$ (38)	$ (12)