Condensed Consolidated Statements Of Comprehensive Income - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Statement of Comprehensive Income [Abstract]
Net income	$ 442	$ 62	$ 811	$ 264
Other comprehensive income, net of tax (Note 10)
Unrealized gain (loss) on cash flow hedges, net of income tax benefit of $1, $5, $1 and $7	17	(7)	18	(11)
Defined benefit plans, net of income tax	0	(1)	0	(1)
Foreign currency translation adjustment, net of income tax expense (benefit) of $0, $5, $(1) and $9	(245)	104	(186)	198
Other comprehensive (loss) income, net of tax	(228)	96	(168)	186
Comprehensive income	$ 214	$ 158	$ 643	$ 450