Condensed Consolidated Statements of Comprehensive Income - USD ($) $ in Millions		3 Months Ended		6 Months Ended
		Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Statement Of Income And Comprehensive Income [Abstract]
Net income		$ 34	$ 58	$ 62	$ 121
Other comprehensive income (loss):
Foreign currency translation adjustments	[1]	(8)	9	1	(19)
Total other comprehensive income (loss)		(8)	9	1	(19)
Comprehensive income		$ 26	$ 67	$ 63	$ 102

[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.