Condensed Consolidated Statements of Stockholders' Equity - USD ($) $ in Millions	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings (Accumulated Deficit) [Member]	Accumulated Other Comprehensive (Loss) Income [Member]	Treasury Shares [Member]	Total
Balance, shares at Dec. 31, 2018	147,000,000
Balance, value at Dec. 31, 2018	$ 2	$ 2,309	$ 156	$ 5	$ (267)	$ 2,204
Treasury Stock, Shares at Dec. 31, 2018					(12,000,000)
Net income (loss)			70			70
Other comprehensive income (loss), net of tax				(2)		(2)
Total Comprehensive Income			70	(2)		68
Exercise of stock options, value		5				5
Stock-based employee compensation		4				4
Repurchase of common stock					$ (2)	(2)
Balance, shares at Mar. 31, 2019	148,000,000
Balance at Mar. 31, 2019	$ 2	2,318	226	3	$ (269)	2,280
Treasury Stock, Shares at Mar. 31, 2019					(12,000,000)
Balance, shares at Dec. 31, 2018	147,000,000
Balance, value at Dec. 31, 2018	$ 2	2,309	156	5	$ (267)	2,204
Treasury Stock, Shares at Dec. 31, 2018					(12,000,000)
Net income (loss)						154
Other comprehensive income (loss), net of tax						(13)
Total Comprehensive Income						141
Balance, shares at Sep. 30, 2019	148,000,000
Balance at Sep. 30, 2019	$ 2	2,330	313	(8)	$ (300)	2,337
Treasury Stock, Shares at Sep. 30, 2019					(12,000,000)
Balance, shares at Mar. 31, 2019	148,000,000
Balance, value at Mar. 31, 2019	$ 2	2,318	226	3	$ (269)	2,280
Treasury Stock, Shares at Mar. 31, 2019					(12,000,000)
Net income (loss)			59			59
Other comprehensive income (loss), net of tax				(4)		(4)
Total Comprehensive Income			59	(4)		55
Exercise of stock options, value		4				4
Stock-based employee compensation		4				4
Repurchase of common stock					$ (15)	(15)
Balance, shares at Jun. 30, 2019	148,000,000
Balance at Jun. 30, 2019	$ 2	2,326	285	(1)	$ (283)	2,329
Treasury Stock, Shares at Jun. 30, 2019					(12,000,000)
Net income (loss)			25			25
Other comprehensive income (loss), net of tax				(7)		(7)
Total Comprehensive Income			25	(7)		18
Issuance of common stock, value						3
Issuance of common stock, value			3
Exercise of stock options, value		1				1
Stock-based employee compensation		3				3
Repurchase of common stock					$ (16)	(16)
Balance, shares at Sep. 30, 2019	148,000,000
Balance at Sep. 30, 2019	$ 2	2,330	313	(8)	$ (300)	2,337
Treasury Stock, Shares at Sep. 30, 2019					(12,000,000)
Balance, shares at Dec. 31, 2019	148,000,000
Balance, value at Dec. 31, 2019	$ 2	2,334	291	9	$ (313)	$ 2,322
Treasury Stock, Shares at Dec. 31, 2019					(12,000,000)	(12,464,905)
Net income (loss)			14			$ 14
Other comprehensive income (loss), net of tax				(50)		(50)
Total Comprehensive Income			14	(50)		(36)
Exercise of stock options, value		2				2
Stock-based employee compensation		5				5
Repurchase of common stock, shares					(4,000,000)
Repurchase of common stock					$ (103)	(103)
Balance, shares at Mar. 31, 2020	148,000,000
Balance at Mar. 31, 2020	$ 2	2,341	305	(41)	$ (417)	2,190
Treasury Stock, Shares at Mar. 31, 2020					(16,000,000)
Balance, shares at Dec. 31, 2019	148,000,000
Balance, value at Dec. 31, 2019	$ 2	2,334	291	9	$ (313)	$ 2,322
Treasury Stock, Shares at Dec. 31, 2019					(12,000,000)	(12,464,905)
Net income (loss)						$ 61
Other comprehensive income (loss), net of tax						(58)
Total Comprehensive Income						3
Balance, shares at Sep. 30, 2020	148,000,000
Balance at Sep. 30, 2020	$ 2	2,352	351	(49)	$ (417)	$ 2,239
Treasury Stock, Shares at Sep. 30, 2020					(16,000,000)	(16,212,226)
Balance, shares at Mar. 31, 2020	148,000,000
Balance, value at Mar. 31, 2020	$ 2	2,341	305	(41)	$ (417)	$ 2,190
Treasury Stock, Shares at Mar. 31, 2020					(16,000,000)
Net income (loss)			53			53
Other comprehensive income (loss), net of tax				1		1
Total Comprehensive Income			53	1		54
Stock-based employee compensation		6				6
Balance, shares at Jun. 30, 2020	148,000,000
Balance at Jun. 30, 2020	$ 2	2,348	358	(40)	$ (417)	2,251
Treasury Stock, Shares at Jun. 30, 2020					(16,000,000)
Net income (loss)			(7)			(7)
Other comprehensive income (loss), net of tax				(10)		(10)
Total Comprehensive Income			(7)	(10)		(16)
Stock-based employee compensation		4				4
Balance, shares at Sep. 30, 2020	148,000,000
Balance at Sep. 30, 2020	$ 2	$ 2,352	$ 351	$ (49)	$ (417)	$ 2,239
Treasury Stock, Shares at Sep. 30, 2020					(16,000,000)	(16,212,226)