Condensed 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 Income And Comprehensive Income [Abstract]
Net income		$ 50	$ 69	$ 110	$ 105
Other comprehensive income (loss):
Foreign currency translation adjustments	[1]	(10)	(5)	(13)	(14)
Total other comprehensive loss		(10)	(5)	(13)	(14)
Comprehensive income		$ 40	$ 64	$ 97	$ 91

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