Condensed Consolidated Statements of Comprehensive Income - USD ($) $ in Millions		3 Months Ended		6 Months Ended
		Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Statement Of Income And Comprehensive Income [Abstract]
Net income		$ 34	$ 32	$ 60	$ 36
Other comprehensive income (loss):
Foreign currency translation adjustments	[1]	(1)	(17)	(3)	(9)
Total other comprehensive loss		(1)	(17)	(3)	(9)
Comprehensive income		$ 33	$ 15	$ 57	$ 27

[1] Foreign currency translation adjustments exclude income taxes due to our intention to indefinitely reinvest the earnings of our foreign subsidiaries in those operations.