Consolidated Statements of Comprehensive Income - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Statement of Comprehensive Income [Abstract]
Net income	$ 110	$ 109	$ 325	$ 326
Other comprehensive loss:
Foreign currency translation adjustments, net of tax	(24)	(16)	(39)	(27)
Other comprehensive loss	(24)	(16)	(39)	(27)
Comprehensive income	$ 86	$ 93	$ 286	$ 299