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Property, Plant and Equipment (Details) - USD ($)
$ in Millions
Sep. 30, 2020
Sep. 30, 2019
Property, Plant and Equipment [Line Items]    
Total property, plant and equipment $ 6,049 $ 6,192
Less: accumulated depreciation (4,468) (4,521)
Property, plant and equipment - net 1,581 1,671
Buildings and improvements    
Property, Plant and Equipment [Line Items]    
Total property, plant and equipment 1,224 1,183
Machinery and equipment    
Property, Plant and Equipment [Line Items]    
Total property, plant and equipment 4,462 4,612
Construction in progress    
Property, Plant and Equipment [Line Items]    
Total property, plant and equipment 256 262
Land    
Property, Plant and Equipment [Line Items]    
Total property, plant and equipment $ 107 $ 135