Organization, Consolidation and Presentation of Financial Statements - Presentation of Financial Statements (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Gross profit	$ 184	$ 168	$ 323	$ 327
Operating profit	75	95	121	179
Other (expense) income, net	(3)	(2)	0	4
Net income	58	36	95	91
Retained earnings (accumulated deficit)	$ (572)		$ (572)		$ (669)
Difference between Revenue Guidance in Effect before and after Topic 606 | Accounting Standards Update 2014-09
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Retained earnings (accumulated deficit)					$ 2
Adjustment | Accounting Standards Update 2017-07
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Gross profit		0		(5)
Operating profit		(1)		(8)
Other (expense) income, net		1		8
Net income		0		0
As Previously Reported
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Gross profit		168		332
Operating profit		96		187
Other (expense) income, net		(3)		(4)
Net income		$ 36		$ 91