CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY (DEFICIT) - USD ($) $ in Millions	Total	Common Stock	Treasury Stock	Paid-in- Capital	Retained Earnings (Deficit)	Accumulated Other Comprehensive Income (Loss)	Common Class A	Common Class A Common Stock	Common Class B	Common Class B Common Stock
Common stock, shares issued, beginning of period (in shares) at Dec. 31, 2016								33,367,000		1,024,000
Stockholders' equity beginning of period at Dec. 31, 2016	$ 770		$ 0	$ 675	$ (32)	$ 127		$ 0		$ 0
Treasury stock, shares, beginning of period (in shares) at Dec. 31, 2016			0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	(30)				(30)
Other comprehensive income (loss), net	5					5
Treasury shares (in shares)			9,000
Treasury shares	$ 0
Common stock issued for restricted stock (in shares)	0	73,000
Class B stock converted to Class A stock (in shares)	0							733,000		(733,000)
Equity award expense	$ 1			1
Common stock, shares issued, end of period (in shares) at Dec. 31, 2017								34,173,000		291,000
Stockholders' equity end of period at Dec. 31, 2017	746		$ 0	676	(62)	132		$ 0		$ 0
Treasury stock, shares, end of period (in shares) at Dec. 31, 2017			9,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	171				171
Other comprehensive income (loss), net	(19)					(19)
Treasury shares (in shares)			77,000
Treasury shares	$ 0		$ (2)	2
Common stock issued for restricted stock (in shares)	0							106,000
Class B stock converted to Class A stock (in shares)	0							291,000		(291,000)
Equity award expense	$ 8			8
Common stock, shares issued, end of period (in shares) at Dec. 31, 2018							34,949,430	34,570,000	0	0
Stockholders' equity end of period at Dec. 31, 2018	$ 906		$ (2)	686	102	120		$ 0		$ 0
Treasury stock, shares, end of period (in shares) at Dec. 31, 2018	85,824		86,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	$ 96				96
Other comprehensive income (loss), net	2					2
Treasury shares (in shares)			159,000
Treasury shares	$ (3)		$ (3)
Common stock issued for restricted stock (in shares)	0							379,000
Equity award expense	$ 12			12
Common stock, shares issued, end of period (in shares) at Dec. 31, 2019							34,936,378	34,949,000	0	0
Stockholders' equity end of period at Dec. 31, 2019	$ 1,013		$ (5)	$ 698	$ 198	$ 122		$ 0		$ 0
Treasury stock, shares, end of period (in shares) at Dec. 31, 2019	245,063		245,000