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Goodwill by Reportable Operating Segment (Detail) - USD ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Segment Reporting Information [Line Items]      
Goodwill $ 21,085 $ 20,276 $ 20,664
Latin America Segment      
Segment Reporting Information [Line Items]      
Goodwill 901 897  
Asia Middle East Africa Segment      
Segment Reporting Information [Line Items]      
Goodwill 3,371 3,324  
Europe Segment      
Segment Reporting Information [Line Items]      
Goodwill 7,880 7,170  
North America Segment      
Segment Reporting Information [Line Items]      
Goodwill $ 8,933 $ 8,885