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Changes in Accumulated Other Comprehensive Loss (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Dec. 31, 2017
Accumulated Other Comprehensive Income (Loss) [Abstract]      
AOCI, Post-employment benefits, net of tax $ (553)   $ (564)
AOCI, Hedge instruments, net of tax (24)   (23)
AOCI, Translation adjustments and other, net of tax (791)   (824)
Accumulated other comprehensive loss, net of tax (1,368)   $ (1,411)
Other Comprehensive (Income) Loss, Defined Benefit Plan, before Reclassification Adjustment, after Tax 0    
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Net of Tax (1)    
Other comprehensive income, translation adjustments and other, before reclassificaitons, net of tax 33    
Other comprehensive income, before reclassifications to income, net of tax 32    
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss), Reclassification Adjustment from AOCI, after Tax 11    
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net 0    
Reclassificaion of translation adjustments and other in AOCI into earnings, net of tax 0    
Other comprehensive income, portion representing reclassificaitons to earnings, net of tax 11    
Post-employment benefits 11 $ 5  
Hedge instruments (1) 0  
Translation adjustments and other 33 95  
Other comprehensive income $ 43 $ 100