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Accumulated Other Comprehensive Losses (Components of Accumulated Other Comprehensive Earnings (Losses), Net of Tax) (Details) - USD ($)
$ in Millions
Jun. 30, 2018
Dec. 31, 2017
Jun. 30, 2017
Dec. 31, 2016
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]        
Total accumulated other comprehensive losses $ (10,168) $ (10,230) $ (10,277) $ (10,900)
Currency translation adjustments [Member]        
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]        
Total accumulated other comprehensive losses (6,229) (5,761) (5,658)  
Pension and other benefits [Member]        
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]        
Total accumulated other comprehensive losses (2,716) (2,816) (3,454)  
Derivatives accounted for as hedges [Member]        
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]        
Total accumulated other comprehensive losses 37 42 42  
Accumulated Other Comprehensive Losses [Member]        
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]        
Total accumulated other comprehensive losses $ (8,908) $ (8,535) $ (9,070) $ (9,559)