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Goodwill by Reportable Segment (Detail) - USD ($)
$ in Millions
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Segment Reporting Information [Line Items]      
Goodwill $ 20,664 $ 23,389 $ 25,597
Latin America Segment      
Segment Reporting Information [Line Items]      
Goodwill 858 1,127  
Asia Pacific Segment      
Segment Reporting Information [Line Items]      
Goodwill 2,520 2,395  
EEMEA Segment      
Segment Reporting Information [Line Items]      
Goodwill 1,304 1,942  
Europe Segment      
Segment Reporting Information [Line Items]      
Goodwill 7,117 8,952  
North America Segment      
Segment Reporting Information [Line Items]      
Goodwill $ 8,865 $ 8,973