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Goodwill and Other Intangibles (Goodwill by Segment) (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Jun. 30, 2018
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Goodwill [Roll Forward]        
Beginning balance December 31, 2017   $ 3,118    
Reassignment of goodwill   0    
Impairment   (579) $ 0 $ 0
Reclassification to asset held for sale   (23)    
Currency translation adjustment   (65)    
Ending net balance December 31, 2018   2,451 3,118  
North America        
Goodwill [Roll Forward]        
Beginning balance December 31, 2017   1,755    
Reassignment of goodwill   (54)    
Impairment   0    
Reclassification to asset held for sale   0    
Currency translation adjustment   (8)    
Ending net balance December 31, 2018   1,693 1,755  
EMEA        
Goodwill [Roll Forward]        
Beginning balance December 31, 2017   920    
Reassignment of goodwill   0    
Impairment $ (579) (579)    
Reclassification to asset held for sale   0    
Currency translation adjustment   (32)    
Ending net balance December 31, 2018   309 920  
Latin America        
Goodwill [Roll Forward]        
Beginning balance December 31, 2017   5    
Reassignment of goodwill   53    
Impairment   0    
Reclassification to asset held for sale   (23)    
Currency translation adjustment   (2)    
Ending net balance December 31, 2018   33 5  
Asia        
Goodwill [Roll Forward]        
Beginning balance December 31, 2017   438    
Reassignment of goodwill   1    
Impairment   0    
Reclassification to asset held for sale   0    
Currency translation adjustment   (23)    
Ending net balance December 31, 2018   $ 416 $ 438