Statement of Comprehensive Income - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Statement of Income and Comprehensive Income [Abstract]
Net income	$ 49	$ 99	$ 117	$ 177
Other comprehensive (loss) income:
Foreign currency translation adjustments, net of tax	(29)	44	(154)	19
Other comprehensive (loss) income	(29)	44	(154)	19
Comprehensive income (loss)	$ 20	$ 143	$ (37)	$ 196