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, 2020	463,901,808
Beginning balance at Dec. 31, 2020	$ 6,842	$ 503	$ 5	$ 6,123	$ 494	$ (258)	$ (25)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Shares issued for restricted stock, net of forfeitures (in shares)	2,515,942
Shares issued for restricted stock, net of forfeitures	$ 0			(28)		28
Compensation expense related to restricted stock awards	31			31
Net (loss) income	596				596
Dividends paid on common stock	(316)				(316)
Dividends paid on preferred stock	$ (33)				(33)
Purchase of common stock (in shares)	(1,402,107)
Purchase of common stock	$ (16)					(16)
Other comprehensive loss, net of tax	$ (60)
Ending balance (in shares) at Dec. 31, 2021	465,015,643
Ending balance at Dec. 31, 2021	$ 7,044	503	5	6,126	741	(246)	(85)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Dividends paid on common stock (in dollars per share)	$ 0.68
Issuance and exercise of FDIC Equity appreciation instrument (in shares)	214,990,316
Issuance and exercise of FDIC Equity appreciation instrument	$ 2,010		2	2,008
Shares issued for restricted stock, net of forfeitures (in shares)	3,548,310
Shares issued for restricted stock, net of forfeitures	$ 0			(33)		33
Compensation expense related to restricted stock awards	29			29
Net (loss) income	650				650
Dividends paid on common stock	(317)				(317)
Dividends paid on preferred stock	$ (33)				(33)
Purchase of common stock (in shares)	(2,336,935)
Purchase of common stock	$ (24)					(24)
Other comprehensive loss, net of tax	$ (535)
Ending balance (in shares) at Dec. 31, 2022	681,217,334
Ending balance at Dec. 31, 2022	$ 8,824	503	7	8,130	1,041	(237)	(620)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Dividends paid on common stock (in dollars per share)	$ 0.68
Issuance and exercise of FDIC Equity appreciation instrument (in shares)	39,032,006
Issuance and exercise of FDIC Equity appreciation instrument	$ 85		0	85
Shares issued for restricted stock, net of forfeitures (in shares)	3,074,565
Shares issued for restricted stock, net of forfeitures	$ 0			(31)		31
Compensation expense related to restricted stock awards	47			47
Net (loss) income	(79)				(79)
Dividends paid on common stock	(486)				(486)
Dividends paid on preferred stock	$ (33)				(33)
Purchase of common stock (in shares)	(1,257,535)
Purchase of common stock	$ (12)					(12)
Other comprehensive loss, net of tax	$ 21
Ending balance (in shares) at Dec. 31, 2023	722,066,370
Ending balance at Dec. 31, 2023	$ 8,367	$ 503	$ 7	$ 8,231	$ 443	$ (218)	$ (599)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Dividends paid on common stock (in dollars per share)	$ 0.56