Consolidated Statement of Comprehensive Income - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Consolidated Statement of Comprehensive Income [Abstract]
Net income	$ 112	$ 88	$ 215	$ 217
Other comprehensive loss:
Foreign currency translation adjustments, net of tax	(22)	(21)	(15)	(11)
Other comprehensive loss	(22)	(21)	(15)	(11)
Comprehensive income	$ 90	$ 67	$ 200	$ 206