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Goodwill by Segment (Detail) - USD ($)
$ in Millions
Jun. 30, 2017
Dec. 31, 2016
Segment Reporting Information [Line Items]    
Goodwill $ 20,915 $ 20,276
Latin America Segment    
Segment Reporting Information [Line Items]    
Goodwill 925 897
Asia Middle East Africa Segment    
Segment Reporting Information [Line Items]    
Goodwill 3,413 3,324
Europe Segment    
Segment Reporting Information [Line Items]    
Goodwill 7,667 7,170
North America Segment    
Segment Reporting Information [Line Items]    
Goodwill $ 8,910 $ 8,885