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Goodwill and Intangible Assets - Goodwill by Segment (Details) - USD ($)
$ in Millions
Mar. 31, 2019
Dec. 31, 2018
Segment Reporting Information [Line Items]    
Goodwill $ 20,686 $ 20,725
Latin America    
Segment Reporting Information [Line Items]    
Goodwill 822 823
AMEA    
Segment Reporting Information [Line Items]    
Goodwill 3,237 3,210
Europe    
Segment Reporting Information [Line Items]    
Goodwill 7,440 7,519
North America    
Segment Reporting Information [Line Items]    
Goodwill $ 9,187 $ 9,173