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Goodwill by Reportable Segment (Detail) - USD ($)
$ in Millions
Sep. 30, 2015
Dec. 31, 2014
Segment Reporting Information [Line Items]    
Goodwill $ 20,963 $ 23,389
Latin America Segment    
Segment Reporting Information [Line Items]    
Goodwill 865 1,127
Asia Pacific Segment    
Segment Reporting Information [Line Items]    
Goodwill 2,517 2,395
EEMEA Segment    
Segment Reporting Information [Line Items]    
Goodwill 1,373 1,942
Europe Segment    
Segment Reporting Information [Line Items]    
Goodwill 7,316 8,952
North America Segment    
Segment Reporting Information [Line Items]    
Goodwill $ 8,892 $ 8,973