Condensed Consolidated Statements of Comprehensive Income - USD ($) $ in Millions		3 Months Ended
		Mar. 31, 2016	Mar. 31, 2015
Statement Of Income And Comprehensive Income [Abstract]
Net income		$ 27	$ 63
Other comprehensive income (loss):
Foreign currency translation adjustments	[1]	9	(28)
Total other comprehensive income (loss)		9	(28)
Comprehensive income		$ 36	$ 35

[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.