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Property, Plant and Equipment (Detail) - USD ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross $ 15,680 $ 14,687
Accumulated depreciation (7,003) (6,458)
Property, plant and equipment, net 8,677 8,229
Land and Land Improvements    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross 458 471
Buildings and Building Improvements    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross 2,979 2,801
Machinery and Equipment    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross 11,195 10,302
Construction in Progress    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross $ 1,048 $ 1,113