Changes in Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Changes in Accumulated Other Comprehensive Loss [Abstract]
AOCI, Post-employment Benefits, net of tax		$ (632)	$ (692)
AOCI, Hedge instruments, net of tax		(25)	(26)
AOCI, Translation adjustments and other, net of tax		(800)	(575)
Accumulated other comprehensive loss		(1,457)	(1,293)
Other Comprehensive (Income) Loss, Pension and Other Postretirement Benefit Plans, Adjustment, before Reclassification Adjustments, Net of Tax		37
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Net of Tax		(4)
Other comprehensive income, translation adjustments and other, before reclassificaitons, net of tax		(206)
Other comprehensive income, before reclassifications to income		(173)
Other Comprehensive (Income) Loss, Reclassification Adjustment from AOCI, Pension and Other Postretirement Benefit Plans, for Net (Gain) Loss, Net of Tax	[1]	23
Amount of Loss Reclassified from AOCI into Income (Effective Portion)	[1]	5
Reclassificaion of translation adjustments and other in AOCI into earnings, net of tax	[1]	(19)
Other comprehensive income, portion representing reclassificaitons to earnings	[1]	9
Post-employment benefits		60	(228)	$ 175
Hedge instruments		1	0	8
Translation adjustments and other		(225)	(260)	(6)
Other comprehensive loss		$ (164)	$ (488)	$ 177

[1] Refer to Note 11, "Pension, Other Post-employment Benefits and Employee Benefit Plans," and Note 7, "Financial Instruments," for additional information with respect to reclassifications from accumulated other comprehensive loss to earnings relating to post-employment benefits, net of tax and hedge instruments, net of tax, respectively. Such items do not represent reclassifications in their entirety.