Condensed Consolidated Statements Of Comprehensive Income - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Statement of Comprehensive Income [Abstract]
Net income	$ 271	$ 369
Other comprehensive income, net of tax (Note 10)
Unrealized (loss) gain on hedges, net of income tax (benefit) expense of $(5) and $1	(15)	1
Foreign currency translation adjustment, net of income tax expense (benefit) of $0 and $(1)	57	59
Other comprehensive income, net of tax	42	60
Comprehensive income	$ 313	$ 429