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Goodwill and Intangible Assets - Goodwill by Segment (Details) - USD ($)
$ in Millions
Jun. 30, 2019
Dec. 31, 2018
Segment Reporting Information [Line Items]    
Goodwill $ 20,701 $ 20,725
Latin America    
Segment Reporting Information [Line Items]    
Goodwill 833 823
AMEA    
Segment Reporting Information [Line Items]    
Goodwill 3,169 3,210
Europe    
Segment Reporting Information [Line Items]    
Goodwill 7,499 7,519
North America    
Segment Reporting Information [Line Items]    
Goodwill $ 9,200 $ 9,173