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Goodwill and Intangible Assets - Goodwill by Segment (Details) - USD ($)
$ in Millions
Mar. 31, 2018
Dec. 31, 2017
Segment Reporting Information [Line Items]    
Goodwill $ 21,301 $ 21,085
Latin America    
Segment Reporting Information [Line Items]    
Goodwill 924 901
AMEA    
Segment Reporting Information [Line Items]    
Goodwill 3,391 3,371
Europe    
Segment Reporting Information [Line Items]    
Goodwill 8,072 7,880
North America    
Segment Reporting Information [Line Items]    
Goodwill $ 8,914 $ 8,933