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Property, Plant and Equipment - Components of Property, Plant and Equipment in Consolidated Balance Sheets (Details) - USD ($)
$ in Millions
Sep. 30, 2019
Sep. 30, 2018
Property Plant And Equipment [Line Items]    
Property, Plant and Equipment, Gross $ 3,165 $ 3,172
Accumulated depreciation (1,588) (1,526)
Net property, plant and equipment 1,577 1,646
Land [Member]    
Property Plant And Equipment [Line Items]    
Property, Plant and Equipment, Gross 148 150
Buildings [Member]    
Property Plant And Equipment [Line Items]    
Property, Plant and Equipment, Gross 461 496
Machinery and Equipment [Member]    
Property Plant And Equipment [Line Items]    
Property, Plant and Equipment, Gross 2,361 2,353
Construction in Progress [Member]    
Property Plant And Equipment [Line Items]    
Property, Plant and Equipment, Gross $ 195 $ 173