Condensed Consolidated Statements Of Comprehensive Income Statement - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Statement of Comprehensive Income [Abstract]
Net income	$ 202	$ 147	$ 466	$ 500
Other comprehensive income (loss), net of tax
Unrealized loss on cash flow hedges, net of income tax benefit of $2, $1, $10 and $3	(3)	(1)	(14)	(5)
Defined benefit plans, net of income tax	0	0	(1)	0
Foreign currency translation adjustment, net of income tax expense of $21, $0, $30 and $0	120	(10)	318	60
Other comprehensive income (loss), net of tax	117	(11)	303	55
Comprehensive income	$ 319	$ 136	$ 769	$ 555