CONSOLIDATED STATEMENTS OF STOCKHOLDERS’ EQUITY - USD ($) $ in Millions	Total	Preferred Stock [Member]	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Treasury Stock [Member]
Balance at beginning of period at Dec. 31, 2018	$ 4,608	$ 107	$ 3	$ 4,049	$ 576	$ (106)	$ (21)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Comprehensive income (loss)	112				94	18
Dividends declared:
Preferred stock	(2)				(2)
Common stock	(39)				(39)
Issuance of common stock	(1)			1			(2)
Repurchase of common stock	(25)						(25)
Restricted stock compensation	2			2
Balance at end of period at Mar. 31, 2019	4,680	107	3	4,052	629	(88)	(23)
Balance at beginning of period at Dec. 31, 2019	4,883	107	3	4,067	798	(65)	(27)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Comprehensive income (loss)	67				47	20
Dividends declared:
Preferred stock	(2)				(2)
Common stock	(39)				(39)
Restricted stock compensation	8			8
Balance at end of period at Mar. 31, 2020	$ 4,842	$ 107	$ 3	$ 4,075	$ 754	$ (45)	$ (52)