Derivative Financial Instruments - Net Gains (Losses) Recorded in the Consolidated Statements of Income Relating to Free-Standing Derivative Instruments Used For Customer Accommodation (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Interest rate contracts | Contract revenue | Capital market fees
Derivative Instruments, Gain (Loss)
Net gains (losses) recorded in earnings	$ 8	$ 5
Interest rate contracts | Credit portion of fair value adjustment | Other noninterest expense
Derivative Instruments, Gain (Loss)
Net gains (losses) recorded in earnings	(3)	3
Interest rate contracts | Interest rate lock commitments | Mortgage banking net revenue
Derivative Instruments, Gain (Loss)
Net gains (losses) recorded in earnings	15	9
Commodity contracts | Contract revenue | Capital market fees
Derivative Instruments, Gain (Loss)
Net gains (losses) recorded in earnings	6	4
Commodity contracts | Credit portion of fair value adjustment | Other noninterest expense
Derivative Instruments, Gain (Loss)
Net gains (losses) recorded in earnings	0	1
Foreign exchange contracts | Other noninterest income
Derivative Instruments, Gain (Loss)
Net gains (losses) recorded in earnings	0	5
Foreign exchange contracts | Contract revenue | Capital market fees
Derivative Instruments, Gain (Loss)
Net gains (losses) recorded in earnings	19	17
Foreign exchange contracts | Contract revenue | Other noninterest income
Derivative Instruments, Gain (Loss)
Net gains (losses) recorded in earnings	$ (10)	$ 4