Derivative Financial Instruments - Net Gains (Losses) Recorded in the Condensed Consolidated Statements of Income Relating to Free-Standing Derivative Instruments Used for Risk Management and Other Business Purposes (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Derivative Instruments, Gain (Loss)
Net gains (losses) recorded in earnings	$ (88)	$ (43)	$ (363)
Interest rate contracts | Capital markets fees | Contract revenue
Derivative Instruments, Gain (Loss)
Net gains (losses) recorded in earnings	29	35	48
Interest rate contracts | Other noninterest expense | Credit portion of fair value adjustment
Derivative Instruments, Gain (Loss)
Net gains (losses) recorded in earnings	4	(2)	10
Interest rate contracts | Mortgage banking net revenue | Interest rate lock commitments
Derivative Instruments, Gain (Loss)
Net gains (losses) recorded in earnings	41	52	16
Interest rate contracts | Mortgage banking net revenue | MSR portfolio
Derivative Instruments, Gain (Loss)
Net gains (losses) recorded in earnings	(88)	(43)	(363)
Foreign exchange contracts | Capital markets fees | Contract revenue
Derivative Instruments, Gain (Loss)
Net gains (losses) recorded in earnings	74	89	70
Foreign exchange contracts | Other noninterest income
Derivative Instruments, Gain (Loss)
Net gains (losses) recorded in earnings	14	(3)	12
Foreign exchange contracts | Other noninterest income | Contract revenue
Derivative Instruments, Gain (Loss)
Net gains (losses) recorded in earnings	6	(14)	8
Foreign exchange contracts | Other noninterest expense | Credit portion of fair value adjustment
Derivative Instruments, Gain (Loss)
Net gains (losses) recorded in earnings	0	4	(3)
Commodity contracts: | Capital markets fees | Contract revenue
Derivative Instruments, Gain (Loss)
Net gains (losses) recorded in earnings	18	36	44
Commodity contracts: | Other noninterest expense | Credit portion of fair value adjustment
Derivative Instruments, Gain (Loss)
Net gains (losses) recorded in earnings	1	0	0
Forward contracts related to residential mortgage loans measured at fair value | Mortgage banking net revenue
Derivative Instruments, Gain (Loss)
Net gains (losses) recorded in earnings	13	(7)	3
Interest-only strips | Other noninterest income
Derivative Instruments, Gain (Loss)
Net gains (losses) recorded in earnings	(1)	(3)	0
Equity Derivatives | Other noninterest income | Swap
Derivative Instruments, Gain (Loss)
Net gains (losses) recorded in earnings	$ (138)	$ (94)	$ (84)