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Goodwill by Reportable Segment (Detail) (USD $)
In Millions, unless otherwise specified
Mar. 31, 2014
Dec. 31, 2013
Segment Reporting Information [Line Items]    
Goodwill $ 25,408 $ 25,597
Latin America
   
Segment Reporting Information [Line Items]    
Goodwill 1,289 1,262
Asia Pacific
   
Segment Reporting Information [Line Items]    
Goodwill 2,536 2,504
EEMEA
   
Segment Reporting Information [Line Items]    
Goodwill 2,503 2,764
Europe Segment
   
Segment Reporting Information [Line Items]    
Goodwill 10,067 10,026
North America Segment
   
Segment Reporting Information [Line Items]    
Goodwill $ 9,013 $ 9,041