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Reportable Segment Information - Schedule of Information About Domestic and International Operations (Details) - USD ($)
$ in Millions
12 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2017
Revenues from External Customers and Long-Lived Assets [Line Items]      
Sales to external customers $ 2,493 $ 2,589 $ 2,309
Net assets (liabilities) 3,571 3,406  
Property, plant and equipment, net 1,577 1,646  
United States [Member]      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Sales to external customers 959 997 880
Net assets (liabilities) 1,789 1,142  
Property, plant and equipment, net 1,231 1,250  
International [Member]      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Sales to external customers 1,534 1,592 $ 1,429
Net assets (liabilities) 1,782 2,264  
Property, plant and equipment, net $ 346 $ 396