Consolidated Statements of Changes In Shareholders' Equity - USD ($) $ in Millions	Total	Preferred stock	Common stock	Accumulated paid-in capital	Retained earnings	Accumulated other comprehensive income (loss)
Balance at beginning of period at Dec. 31, 2020	$ 7,886	$ 566	$ 0	$ 2,686	$ 4,309	$ 325
Balance at beginning of period (in shares) at Dec. 31, 2020			164,090,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income for the period	322				322
Other comprehensive income (loss), net of tax	(177)					(177)
Bank common stock repurchased (in shares)			(1,012,000)
Bank common stock repurchased	(50)			(50)
Net activity under employee plans and related tax benefits (in shares)			722,000
Net activity under employee plans and related tax benefits	17			17
Dividends on preferred stock	(8)				(8)
Dividends on common stock	(57)				(57)
Balance at end of period at Mar. 31, 2021	7,933	566	$ 0	2,653	4,566	148
Balance at end of period (in shares) at Mar. 31, 2021			163,800,000
Balance at beginning of period at Dec. 31, 2021	$ 7,463	440	$ 0	1,928	5,175	(80)
Balance at beginning of period (in shares) at Dec. 31, 2021	151,625,000		151,625,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income for the period	$ 203				203
Other comprehensive income (loss), net of tax	$ (1,266)					(1,266)
Bank common stock repurchased (in shares)	(800,000)		(778,000)
Bank common stock repurchased	$ (51)			(51)
Net activity under employee plans and related tax benefits (in shares)			501,000
Net activity under employee plans and related tax benefits	12			12
Dividends on preferred stock	(8)				(8)
Dividends on common stock	(58)				(58)
Change in deferred compensation	(1)				(1)
Balance at end of period at Mar. 31, 2022	$ 6,294	$ 440	$ 0	$ 1,889	$ 5,311	$ (1,346)
Balance at end of period (in shares) at Mar. 31, 2022	151,348,000		151,348,000