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Financial Instruments - Fair Value of Financial Instruments by Valuation Hierarchy (Details) - USD ($)
$ in Millions
Jun. 30, 2019
Sep. 30, 2018
Level 1    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Cash and cash equivalents $ 111 $ 115
Short-term debt 0 0
Long-term debt 0 0
Level 1 | Foreign exchange forward contracts    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Foreign contracts and cross-currency swaps (other assets) 0 0
Foreign contracts and cross-currency swaps (other liabilities) 0 0
Level 1 | Foreign currency option contracts | Short-term    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Foreign contracts and cross-currency swaps (other assets) 0 0
Level 1 | Cross-currency swaps    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Foreign contracts and cross-currency swaps (other liabilities) 0  
Level 1 | Cross-currency swaps | Short-term    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Foreign contracts and cross-currency swaps (other assets) 0 0
Level 2    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Cash and cash equivalents 0 0
Short-term debt 49 114
Long-term debt 801 771
Level 2 | Foreign exchange forward contracts    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Foreign contracts and cross-currency swaps (other assets) 1 2
Foreign contracts and cross-currency swaps (other liabilities) 0 0
Level 2 | Foreign currency option contracts | Short-term    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Foreign contracts and cross-currency swaps (other assets) 0 0
Level 2 | Cross-currency swaps    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Foreign contracts and cross-currency swaps (other liabilities) 5  
Level 2 | Cross-currency swaps | Short-term    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Foreign contracts and cross-currency swaps (other assets) 0 6
Level 3    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Cash and cash equivalents 0 0
Short-term debt 2 2
Long-term debt 5 5
Level 3 | Foreign exchange forward contracts    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Foreign contracts and cross-currency swaps (other assets) 0 0
Foreign contracts and cross-currency swaps (other liabilities) 1 0
Level 3 | Foreign currency option contracts | Short-term    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Foreign contracts and cross-currency swaps (other assets) 0 0
Level 3 | Cross-currency swaps    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Foreign contracts and cross-currency swaps (other liabilities) 0  
Level 3 | Cross-currency swaps | Short-term    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Foreign contracts and cross-currency swaps (other assets) $ 0 $ 0