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Property, Plant and Equipment (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross $ 16,355 $ 15,537
Accumulated depreciation (7,329) (6,804)
Property, plant and equipment, net 9,026 8,733
Land and land improvements    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross 422 422
Buildings and building improvements    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross 3,252 3,140
Machinery and equipment    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross 12,053 11,295
Construction in progress    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross $ 628 $ 680