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	Additional Paid In Capital Class A Common Stock	Retained Earnings	Retained Earnings Class A Common Stock	Retained Earnings Class B Common Stock	Retained Earnings Series A Preferred Stock	Retained Earnings Series C Preferred Stock	Accumulated Other Comprehensive Income (Loss)
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	147													147
Other comprehensive loss, net of tax	(46)																		(46)
Cash dividends declared		$ (4)	$ 0												$ (4)	$ 0
Preferred stock dividends declared	(5)													(5)
Ending balance, shareholders' equity at Mar. 31, 2021	4,321						340			9	1	0		4,005					(34)
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	271													271
Other comprehensive loss, net of tax	(315)																		(315)
Issued in CIT Merger:		5,279			$ 334	$ 207		$ 334	$ 207	6			$ 5,273
Stock based compensation	71											71
Cash dividends declared		$ (7)	$ 0												$ (7)	$ 0
Preferred stock dividends declared				$ (5)		$ (3)											$ (5)	$ (3)
Ending balance, shareholders' equity at Mar. 31, 2022	$ 10,570						$ 881			$ 15	$ 1	$ 5,344		$ 4,634					$ (305)