CONSOLIDATED STATEMENTS OF STOCKHOLDERS’ EQUITY - USD ($) $ in Millions	Total	Preferred Stock	Common Stock	Additional Paid-In Capital	Retained Earnings	Accumulated Other Comprehensive Income (Loss)	Treasury Stock
Balance at beginning of period at Dec. 31, 2020	$ 4,959	$ 107	$ 3	$ 4,087	$ 869	$ (39)	$ (68)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Comprehensive income	81				93	(12)
Dividends declared:
Preferred stock	(2)				(2)
Common stock	(39)				(39)
Issuance of common stock	0			1			(1)
Repurchase of common stock	(36)						(36)
Restricted stock compensation	11			11
Balance at end of period at Mar. 31, 2021	4,974	107	3	4,099	921	(51)	(105)
Balance at beginning of period at Dec. 31, 2021	5,150	107	3	4,109	1,110	(62)	(117)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Comprehensive income	(87)				53	(140)
Dividends declared:
Preferred stock	(2)				(2)
Common stock	(43)				(43)
Issuance of common stock	0			1			(1)
Issuance of common stock - acquisitions	443		1	442
Repurchase of common stock	(30)						(30)
Restricted stock compensation	8			8
Balance at end of period at Mar. 31, 2022	$ 5,439	$ 107	$ 4	$ 4,560	$ 1,118	$ (202)	$ (148)