Condensed Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Statement of Comprehensive Income [Abstract]
Net income	$ 88	$ 106	$ 226	$ 241
Other comprehensive income (loss), before tax:
Foreign currency translation adjustment	(39)	(114)	(142)	(113)
Foreign currency gain reclassified into net income	0	0	(8)	0
Net change in cash flow hedges:
Unrealized losses	0	(6)	(5)	(14)
Amount of loss reclassified into net income	5	2	17	1
Net change in postretirement benefit plans:
Net gain	0	10	0	3
Amortization of net actuarial loss into net income	4	2	12	8
Other comprehensive loss, before tax	(30)	(106)	(126)	(115)
Income tax impact related to items of other comprehensive loss	1	3	4	3
Other comprehensive loss, net of tax	(31)	(109)	(130)	(118)
Comprehensive income (loss)	$ 57	$ (3)	$ 96	$ 123