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 (loss)	188				195	(7)
Dividends declared:
Preferred stock	(4)				(4)
Common stock	(78)				(78)
Issuance of common stock	(3)			3	(1)		(5)
Repurchase of common stock	(36)						(36)
Restricted stock compensation	11			11
Balance at end of period at Jun. 30, 2021	5,037	107	3	4,101	981	(46)	(109)
Balance at beginning of period at Mar. 31, 2021	4,974	107	3	4,099	921	(51)	(105)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Comprehensive income (loss)	107				102	5
Dividends declared:
Preferred stock	(2)				(2)
Common stock	(39)				(39)
Issuance of common stock	(3)			2	(1)		(4)
Balance at end of period at Jun. 30, 2021	5,037	107	3	4,101	981	(46)	(109)
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 (loss)	(28)				162	(190)
Dividends declared:
Preferred stock	(4)				(4)
Common stock	(86)				(86)
Issuance of common stock	(6)			1			(7)
Issuance of common stock - acquisitions	443		1	442
Repurchase of common stock	(43)						(43)
Restricted stock compensation	10			10
Balance at end of period at Jun. 30, 2022	5,436	107	4	4,562	1,182	(252)	(167)
Balance at beginning of period at Mar. 31, 2022	5,439	107	4	4,560	1,118	(202)	(148)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Comprehensive income (loss)	59				109	(50)
Dividends declared:
Preferred stock	(2)				(2)
Common stock	(43)				(43)
Issuance of common stock	(6)						(6)
Repurchase of common stock	(13)						(13)
Restricted stock compensation	2			2
Balance at end of period at Jun. 30, 2022	$ 5,436	$ 107	$ 4	$ 4,562	$ 1,182	$ (252)	$ (167)