Consolidated Statement of Comprehensive Income - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Consolidated Statement of Comprehensive Income [Abstract]
Net income	$ 57	$ 57	$ 116	$ 108
Other comprehensive income (loss):
Foreign currency translation adjustments, net of tax	14	(85)	322	(32)
Other comprehensive income (loss)	14	(85)	322	(32)
Comprehensive income (loss)	$ 71	$ (28)	$ 438	$ 76