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Property, Plant and Equipment (Details) - USD ($)
$ in Millions
Jun. 30, 2018
Dec. 31, 2017
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross $ 15,320 $ 15,680
Accumulated depreciation (6,936) (7,003)
Property, plant and equipment, net 8,384 8,677
Land and land improvements    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross 439 458
Buildings and building improvements    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross 2,950 2,979
Machinery and equipment    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross 10,947 11,195
Construction in progress    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross $ 984 $ 1,048