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 Comprehensive Income [Abstract]
Net income	$ 403	$ 442	$ 674	$ 811
Other comprehensive (loss) income, net of tax (Note 10)
Unrealized (loss) gain on hedges, net of income tax benefit of $6, $1, $11 and $1	(18)	17	(33)	18
Foreign currency translation adjustment, net of income tax expense (benefit) of $0, $0, $0 and $(1)	8	(245)	65	(186)
Other comprehensive (loss) income, net of tax	(10)	(228)	32	(168)
Comprehensive income	$ 393	$ 214	$ 706	$ 643