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	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Derivative Instruments, Gain (Loss)
Net gains (losses) recorded in earnings	$ (16)	$ (56)	$ (62)	$ (35)
Interest rate contracts | Mortgage banking net revenue | MSR portfolio
Derivative Instruments, Gain (Loss)
Net gains (losses) recorded in earnings	(16)	(56)	(62)	(35)
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	1	11	6	3
Interest-only strips | Other noninterest income
Derivative Instruments, Gain (Loss)
Net gains (losses) recorded in earnings	0	(3)	0	(3)
Foreign exchange contracts | Other noninterest income
Derivative Instruments, Gain (Loss)
Net gains (losses) recorded in earnings	2	(3)	7	(3)
Equity contracts | Other noninterest income | Swap
Derivative Instruments, Gain (Loss)
Net gains (losses) recorded in earnings	$ (23)	$ (30)	$ (40)	$ (61)