Fair Value (Nonrecurring Fair Value Measurements) (Details) - Fair Value, Nonrecurring - Level 3 - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024	Dec. 31, 2024
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	$ 683		$ 683		$ 853
Gains (Losses)	(44)	$ (188)	(99)	$ (254)
Nonaccrual loans
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	519		519		629
Gains (Losses)	(38)	(192)	(93)	(245)
Equity investments
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	154		154		198
Gains (Losses)	(2)	8	(2)	(1)
OREO and foreclosed assets
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	5		5		8
Gains (Losses)	(1)	(1)	(1)	(2)
Long-lived assets
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	5		5		$ 18
Gains (Losses)	$ (3)	$ (3)	$ (3)	$ (6)