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Property, Plant and Equipment (Details) - USD ($)
$ in Millions
Jun. 30, 2019
Dec. 31, 2018
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross $ 15,211 $ 15,245
Accumulated depreciation (6,661) (6,763)
Property, plant and equipment, net 8,550 8,482
Land and land improvements    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross 422 424
Buildings and building improvements    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross 3,017 2,984
Machinery and equipment    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross 10,918 10,943
Construction in progress    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross $ 854 $ 894