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Property, Plant and Equipment (Details) - USD ($)
$ in Millions
Mar. 31, 2021
Dec. 31, 2020
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross $ 16,112 $ 16,355
Accumulated depreciation (7,346) (7,329)
Property, plant and equipment, net 8,766 9,026
Land and land improvements    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross 411 422
Buildings and building improvements    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross 3,196 3,252
Machinery and equipment    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross 11,889 12,053
Construction in progress    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross $ 616 $ 628