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Goodwill by Reportable Segment (Detail) - USD ($)
$ in Millions
Sep. 30, 2016
Dec. 31, 2015
Segment Reporting Information [Line Items]    
Goodwill $ 20,751 $ 20,664
Latin America Segment    
Segment Reporting Information [Line Items]    
Goodwill 917 858
Asia Pacific Segment    
Segment Reporting Information [Line Items]    
Goodwill 2,489 2,520
EEMEA Segment    
Segment Reporting Information [Line Items]    
Goodwill 1,337 1,304
Europe Segment    
Segment Reporting Information [Line Items]    
Goodwill 7,107 7,117
North America Segment    
Segment Reporting Information [Line Items]    
Goodwill $ 8,901 $ 8,865