Changes in Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Changes in Accumulated Other Comprehensive Loss [Abstract]
AOCI, Post-employment Benefits, net of tax	$ (564)	$ (614)
AOCI, Hedge instruments, net of tax	(23)	(22)
AOCI, Translation adjustments and other, net of tax	(824)	(948)
Accumulated other comprehensive loss	(1,411)	(1,584)
Other Comprehensive (Income) Loss, Defined Benefit Plan, before Reclassification Adjustment, after Tax	30
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Net of Tax	2
Other comprehensive income, translation adjustments and other, before reclassificaitons, net of tax	124
Other comprehensive income, before reclassifications to income	156
Other Comprehensive (Income) Loss, Reclassification Adjustment from AOCI, Pension and Other Postretirement Benefit Plans, for Net (Gain) Loss, Net of Tax	20
Amount of Loss Reclassified from AOCI into Income (Effective Portion)	(3)
Reclassificaion of translation adjustments and other in AOCI into earnings, net of tax	0
Other comprehensive income, portion representing reclassificaitons to earnings	17
Post-employment benefits	50	18	$ 60
Hedge instruments	(1)	3	1
Translation adjustments and other	124	(148)	(225)
Other comprehensive income (loss), net of tax	$ 173	$ (127)	$ (164)

Accumulated adjustment, net of tax, that results from the process of translating subsidiary financial statements and foreign equity investments into the reporting currency from the functional currency of the reporting entity, net of reclassification of realized foreign currency translation gains or losses. Also includes other immaterial balances.

No definition available.