Condensed Consolidated Statements Of Comprehensive Income - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Statement of Comprehensive Income [Abstract]
Net income	$ 34	$ 90
Other comprehensive income, net of tax
Foreign currency translation adjustments	14	29
Unrealized losses on cash flow hedges	(1)	0
Defined benefit pension plans	1	0
Other comprehensive income, net of tax	14	29
Comprehensive income	$ 48	$ 119