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Property, Plant & Equipment (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2020
Dec. 31, 2019
Property, Plant and Equipment [Line Items]    
Accumulated depreciation $ (6,388) $ (6,444)
Property, plant and equipment, net 3,156 3,301
Disposed of fully depreciated buildings, machinery and equipment 18  
Land    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross 88 97
Buildings    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross 1,503 1,540
Machinery and equipment    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross $ 7,953 $ 8,108