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Property, Plant & Equipment (Details) - USD ($)
$ in Millions
6 Months Ended
Jun. 30, 2020
Dec. 31, 2019
Property, Plant and Equipment [Line Items]    
Accumulated depreciation $ (6,497) $ (6,444)
Property, plant and equipment, net 3,132 3,301
Disposed of fully depreciated buildings, machinery and equipment 20  
Land    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross 89 97
Buildings    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross 1,518 1,540
Machinery and equipment    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross $ 8,022 $ 8,108