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Goodwill and Intangible Assets - Goodwill by Reportable Operating Segment (Details) - USD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Segment Reporting Information [Line Items]      
Goodwill $ 20,725 $ 21,085 $ 20,276
Latin America      
Segment Reporting Information [Line Items]      
Goodwill 823 901  
AMEA      
Segment Reporting Information [Line Items]      
Goodwill 3,210 3,371  
Europe      
Segment Reporting Information [Line Items]      
Goodwill 7,519 7,880  
North America      
Segment Reporting Information [Line Items]      
Goodwill $ 9,173 $ 8,933