Consolidated Statements of Changes in Shareholders' Equity (Unaudited) - USD ($) $ in Millions	Total	Class A Common Stock	Class B Common Stock	Series A Preferred Stock	Series B Preferred Stock	Series C Preferred Stock	Preferred Stock	Preferred Stock Series B Preferred Stock	Preferred Stock Series C Preferred Stock	Common Stock Class A Common Stock	Common Stock Class B Common Stock	Additional Paid in Capital	Retained Earnings	Retained Earnings Class A Common Stock	Retained Earnings Class B Common Stock	Retained Earnings Series A Preferred Stock	Retained Earnings Series B Preferred Stock	Retained Earnings Series C Preferred Stock	Accumulated Other Comprehensive (Loss) Income
Beginning balance, shareholders' equity at Dec. 31, 2020	$ 4,229						$ 340			$ 9	$ 1	$ 0	$ 3,867						$ 12
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	300												300
Other comprehensive loss, net of tax	(34)																		(34)
Cash dividends declared		$ (8)	$ (1)											$ (8)	$ (1)
Preferred stock dividends declared	(9)												(9)
Ending balance, shareholders' equity at Jun. 30, 2021	4,477						340			9	1	0	4,149						(22)
Beginning balance, shareholders' equity at Mar. 31, 2021	4,321						340			9	1	0	4,005						(34)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	153												153
Other comprehensive loss, net of tax	12																		12
Cash dividends declared		(4)	0											(4)	0
Preferred stock dividends declared	(5)												(5)
Ending balance, shareholders' equity at Jun. 30, 2021	4,477						340			9	1	0	4,149						(22)
Beginning balance, shareholders' equity at Dec. 31, 2021	4,738						340			9	1	0	4,378						10
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	526												526
Other comprehensive loss, net of tax	(475)																		(475)
Issued in CIT Merger:	5,279				$ 334	$ 207		$ 334	$ 207	6		5,273
Stock based compensation	72											72
Cash dividends declared		(14)	(1)											(14)	(1)
Preferred stock dividends declared				$ (9)	(9)	(6)										$ (9)	$ (9)	$ (6)
Ending balance, shareholders' equity at Jun. 30, 2022	10,642						881			15	1	5,345	4,865						(465)
Beginning balance, shareholders' equity at Mar. 31, 2022	10,570						881			15	1	5,344	4,634						(305)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	255												255
Other comprehensive loss, net of tax	(160)																		(160)
Stock based compensation	1											1
Cash dividends declared		$ (7)	$ 0											$ (7)	$ 0
Preferred stock dividends declared				$ (5)	$ (9)	$ (3)										$ (5)	$ (9)	$ (3)
Ending balance, shareholders' equity at Jun. 30, 2022	$ 10,642						$ 881			$ 15	$ 1	$ 5,345	$ 4,865						$ (465)