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Fixed Assets - Components of Fixed Assets (Detail) - USD ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Property, Plant and Equipment [Line Items]    
Property plant and equipment, gross $ 16,774 $ 14,545
Property plant and equipment, net 8,141 7,022
Land [Member]    
Property, Plant and Equipment [Line Items]    
Property plant and equipment, gross 269 254
Building [Member]    
Property, Plant and Equipment [Line Items]    
Property plant and equipment, gross 2,232 1,942
Accumulated depreciation (778) (652)
Machinery and Equipment [Member]    
Property, Plant and Equipment [Line Items]    
Property plant and equipment, gross 14,273 12,349
Accumulated depreciation $ (7,855) $ (6,871)