Consolidated Statements of Comprehensive Income - USD ($) $ in Millions		3 Months Ended		9 Months Ended
		Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Statement Of Income And Comprehensive Income [Abstract]
Net income		$ 74	$ 54	$ 195	$ 190
Other comprehensive income (loss):
Foreign currency translation adjustments	[1]	(10)	(14)	(29)	(14)
Reclassification adjustment on sale of business included in total other income (expense), net (Note 3)		1		1
Total other comprehensive loss		(9)	(14)	(28)	(14)
Comprehensive income		$ 65	$ 40	$ 167	$ 176

[1] Foreign currency translation adjustments exclude income taxes due to our practice and intention to indefinitely reinvest the earnings of our foreign subsidiaries in those operations.