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Goodwill by Segment (Detail) - USD ($)
$ in Millions
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Segment Reporting Information [Line Items]      
Goodwill $ 20,276 $ 20,664 $ 23,389
Latin America Segment      
Segment Reporting Information [Line Items]      
Goodwill 897 858  
Asia Middle East Africa Segment      
Segment Reporting Information [Line Items]      
Goodwill 3,324 3,537  
Europe Segment      
Segment Reporting Information [Line Items]      
Goodwill 7,170 7,404  
North America Segment      
Segment Reporting Information [Line Items]      
Goodwill $ 8,885 $ 8,865