Fair Value of Assets and Liabilities - Gains/(losses) on Nonrecurring Fair Value Measurements (Details) - Non Recurring - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Net gains/(losses),loans and leases	$ (6)	$ (9)	$ (7)	$ (12)
Net gains/(losses), OREO	0	0	0	(1)
Net gains/(losses), Other assets	(3)	(2)	(5)	(2)
Gains (losses) on financial assets measured on non-recurring basis	(11)	(13)	(16)	(18)
SBAs
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Net gains/(losses), loans held for sale - SBAs and USDA	$ (2)	$ (2)	$ (4)	$ (3)