Consolidated Statements of Changes in Stockholders' Equity - USD ($) $ in Millions	Total	Preferred Stock (Par Value: $0.01)	Common Stock (Par Value: $0.01)	Paid-in Capital in excess of Par	Retained Earnings	Treasury Stock, at Cost	Accumulated Other Comprehensive Loss, Net of Tax
Beginning balance (in shares) at Dec. 31, 2021	465,015,643
Beginning balance at Dec. 31, 2021	$ 7,044	$ 503	$ 5	$ 6,126	$ 741	$ (246)	$ (85)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Shares issued for restricted stock, net of forfeitures (in shares)	2,910,435
Shares issued for restricted stock, net of forfeitures	$ 0			(26)		26
Compensation expense related to restricted stock awards	7			7
Net income	155				155
Dividends paid on common stock	(79)				(79)
Dividends paid on preferred stock	$ (8)				(8)
Purchase of common stock (in shares)	(901,934)
Purchase of common stock	$ (11)					(11)
Other comprehensive loss, net of tax	$ (199)						(199)
Ending balance (in shares) at Mar. 31, 2022	467,024,144
Ending balance at Mar. 31, 2022	$ 6,909	503	5	6,107	809	(231)	(284)
Beginning balance (in shares) at Dec. 31, 2022	681,217,334
Beginning balance at Dec. 31, 2022	$ 8,824	503	7	8,130	1,041	(237)	(620)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance and exercise of FDIC Equity appreciation instrument (in shares)	39,032,006
Issuance and exercise of FDIC Equity appreciation instrument	$ 85			85
Shares issued for restricted stock, net of forfeitures (in shares)	2,877,411
Shares issued for restricted stock, net of forfeitures	$ 0			(27)		27
Compensation expense related to restricted stock awards	9			9
Net income	2,006				2,006
Dividends paid on common stock	(116)				(116)
Dividends paid on preferred stock	$ (8)				(8)
Purchase of common stock (in shares)	(976,454)
Purchase of common stock	$ (9)					(9)
Other comprehensive loss, net of tax	$ (9)						(9)
Ending balance (in shares) at Mar. 31, 2023	722,150,297
Ending balance at Mar. 31, 2023	$ 10,782	$ 503	$ 7	$ 8,197	$ 2,923	$ (219)	$ (629)