Consolidated Statements of Changes in Shareholders' Equity - USD ($) $ in Millions	Total	Cumulative Effect, Period of Adoption, Adjustment	Preferred stock	Common stock	Accumulated paid-in capital	Retained earnings	Retained earnings Cumulative Effect, Period of Adoption, Adjustment	Accumulated other comprehensive income (loss)
Beginning balance at Dec. 31, 2019	$ 7,353	$ 20	$ 566	$ 0	$ 2,735	$ 4,009	$ 20	$ 43
Beginning balance (in shares) at Dec. 31, 2019				165,057,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	539					539
Other comprehensive income (loss), net of tax	282							282
Bank common stock repurchased (in shares)				(1,686,000)
Bank common stock repurchased	(76)				(76)
Net shares issued from stock warrant exercises (in shares)				1,000
Net activity under employee plans and related tax benefits (in shares)				718,000
Net activity under employee plans and related tax benefits	27				27
Dividends on preferred stock	(34)					(34)
Dividends on common stock	(225)					(225)
Ending balance at Dec. 31, 2020	7,886		566	$ 0	2,686	4,309		325
Ending balance (in shares) at Dec. 31, 2020				164,090,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	1,129					1,129
Other comprehensive income (loss), net of tax	$ (405)							(405)
Bank common stock repurchased (in shares)	(13,500,000)			(13,521,000)
Bank common stock repurchased	$ (800)				(800)
Preferred stock redemption	(126)		(126)		3	(3)
Net activity under employee plans and related tax benefits (in shares)				1,056,000
Net activity under employee plans and related tax benefits	39				39
Dividends on preferred stock	(29)					(29)
Dividends on common stock	(232)					(232)
Change in deferred compensation	1					1
Ending balance at Dec. 31, 2021	$ 7,463		440	$ 0	1,928	5,175		(80)
Ending balance (in shares) at Dec. 31, 2021	151,625,000			151,625,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	$ 907					907
Other comprehensive income (loss), net of tax	$ (3,032)							(3,032)
Bank common stock repurchased (in shares)	(3,600,000)			(3,581,000)
Bank common stock repurchased	$ (202)				(202)
Net activity under employee plans and related tax benefits (in shares)				620,000
Net activity under employee plans and related tax benefits	28				28
Dividends on preferred stock	(29)					(29)
Dividends on common stock	(240)					(240)
Change in deferred compensation	(2)					(2)
Ending balance at Dec. 31, 2022	$ 4,893		$ 440	$ 0	$ 1,754	$ 5,811		$ (3,112)
Ending balance (in shares) at Dec. 31, 2022	148,664,000			148,664,000