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Goodwill and Intangible Assets - Goodwill by Segment (Details) - USD ($)
$ in Millions
Sep. 30, 2018
Dec. 31, 2017
Segment Reporting Information [Line Items]    
Goodwill $ 20,900 $ 21,085
Latin America    
Segment Reporting Information [Line Items]    
Goodwill 819 901
AMEA    
Segment Reporting Information [Line Items]    
Goodwill 3,222 3,371
Europe    
Segment Reporting Information [Line Items]    
Goodwill 7,611 7,880
North America    
Segment Reporting Information [Line Items]    
Goodwill $ 9,248 $ 8,933