Condensed Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Statement of Comprehensive Income [Abstract]
Net income	$ 73	$ 88	$ 210	$ 226
Other comprehensive (loss) income, before tax:
Foreign currency translation adjustment	(8)	(39)	(25)	(142)
Foreign currency gain reclassified into net income	0	0	0	(8)
Net change in derivative hedge agreements:
Unrealized losses	0	0	0	(5)
Amount of (gain) loss reclassified into net income	(1)	5	(2)	17
Net change in postretirement benefit plans:
Amortization of net actuarial loss into net income	3	4	8	12
Other comprehensive loss, before tax	(6)	(30)	(19)	(126)
Income tax impact related to items of other comprehensive income	(3)	1	(2)	4
Other comprehensive loss, net of tax	(3)	(31)	(17)	(130)
Comprehensive income	$ 70	$ 57	$ 193	$ 96