CONSOLIDATED STATEMENTS OF EQUITY - USD ($) shares in Thousands, $ in Millions	Total	Cumulative Effect, Period of Adoption, Adjustment	Common Stock	Additional Paid-In Capital	Additional Paid-In Capital Cumulative Effect, Period of Adoption, Adjustment	Accumulated Other Comprehensive Loss	Accumulated Other Comprehensive Loss Cumulative Effect, Period of Adoption, Adjustment	Accumulated (Deficit) Earnings	Accumulated (Deficit) Earnings Cumulative Effect, Period of Adoption, Adjustment	Treasury Stock
Beginning balance at Dec. 31, 2017	$ 427	$ 1	$ 14	$ 822	$ 0	$ (55)		$ (353)	$ 1	$ 1
Beginning balance, shares at Dec. 31, 2017			136,000							5,000
Stock-based compensation expense	24			24
Dividend declared	(133)							(133)
Shares repurchased for tax withholdings for vested stock awards	(6)			(6)
Other	0			1				(1)
Comprehensive income (loss), net of income taxes	174					22		152
Ending balance at Dec. 31, 2018	487	$ 0	$ 14	841	$ 0	(33)	$ 1	(334)	$ (1)	$ 1
Ending balance, shares at Dec. 31, 2018			136,000							5,000
Stock-based compensation expense	25			25
Dividend declared	(135)							(135)
Shares repurchased for tax withholdings for vested stock awards	(8)			(8)
Shares issued in non-vested stock award	1									$ 1
Other	(1)			(1)				0
Comprehensive income (loss), net of income taxes	7					(3)		10
Ending balance at Dec. 31, 2019	376		$ 14	857		(35)		(460)		$ 0
Ending balance, shares at Dec. 31, 2019			136,000							5,000
Stock-based compensation expense	29			29
Dividend declared	(66)							(66)
Shares repurchased for tax withholdings for vested stock awards	(5)			(5)
Shares issued in non-vested stock award	0									$ 0
Shares issued in non-vested stock award (in shares)										(1,000)
Other	1			1				0
Comprehensive income (loss), net of income taxes	(25)					3		(28)
Ending balance at Dec. 31, 2020	$ 310		$ 14	$ 882		$ (32)		$ (554)		$ 0
Ending balance, shares at Dec. 31, 2020			136,000							4,000