Fair Value (Nonrecurring Fair Value Measurements) (Details) - Fair Value, Nonrecurring - Level 3 - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021	Dec. 31, 2021
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Nonrecurring Assets - Fair Value	$ 253		$ 253		$ 457
Nonrecurring Assets - Gains (Losses)	(112)	$ (10)	(150)	$ (38)
Nonaccrual loans
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Nonrecurring Assets - Fair Value	211		211		348
Nonrecurring Assets - Gains (Losses)	(111)	(3)	(145)	(3)
Equity investments
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Nonrecurring Assets - Fair Value	30		30
Nonrecurring Assets - Gains (Losses)
Loans held for sale
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Nonrecurring Assets - Gains (Losses)		(1)		(18)
OREO and foreclosed assets
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Nonrecurring Assets - Fair Value	9		9		6
Nonrecurring Assets - Gains (Losses)
Long-lived assets
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Nonrecurring Assets - Fair Value	3		3		$ 103
Nonrecurring Assets - Gains (Losses)	$ (1)	$ (6)	$ (5)	$ (17)