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Financial Instruments - Fair Value of Financial Instruments (Details) - USD ($)
$ in Millions
Mar. 31, 2020
Sep. 30, 2019
Carrying Value    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Cash and cash equivalents $ 508 $ 108
Short-term debt 138 41
Long-term debt 1,203 902
Carrying Value | Foreign exchange forward contracts    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Foreign currency contract assets 1 0
Foreign currency contract liabilities 3 0
Carrying Value | Cross-currency swaps    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Foreign currency contract assets 0 10
Foreign currency contract liabilities 0 5
Fair Value    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Cash and cash equivalents 508 108
Short-term debt 144 60
Long-term debt 1,179 953
Fair Value | Foreign exchange forward contracts    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Foreign currency contract assets 1 0
Foreign currency contract liabilities 3 0
Fair Value | Cross-currency swaps    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Foreign currency contract assets 0 10
Foreign currency contract liabilities $ 0 $ 5