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Property, Plant & Equipment (Details) - USD ($)
$ in Millions
9 Months Ended
Sep. 30, 2019
Dec. 31, 2018
Property, Plant and Equipment [Line Items]    
Accumulated depreciation $ (6,331) $ (6,190)
Property, plant and equipment, net 3,203 3,414
Disposed of fully depreciated buildings, machinery and equipment 57  
Land    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross 98 102
Buildings    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross 1,585 1,593
Machinery and equipment    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross $ 7,851 $ 7,909