Long-Term Debt and Shareholders' Equity (Amounts Reclassified from AOCI) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Accumulated Other Comprehensive Income (Loss) [Line Items]
Interest and fees on loans	$ 726	$ 437
Less: Income tax expense (benefit)	78	52
Net income	204	203
Net unrealized gains/(losses) on derivatives and other | Amounts reclassified from AOCI
Accumulated Other Comprehensive Income (Loss) [Line Items]
Interest and fees on loans	(49)	14
Less: Income tax expense (benefit)	(12)	4
Net income	$ (37)	$ 10