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Financial Instruments - Fair Value of Financial Instruments by Valuation Hierarchy (Details) - USD ($)
$ in Millions
Dec. 31, 2018
Sep. 30, 2018
Level 1    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Cash and cash equivalents $ 127 $ 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 exchange forward contracts (other liabilities) 0 0
Foreign currency option contracts (asset) 0 0
Level 1 | Foreign currency option contracts | Short-term    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Foreign currency option contracts (asset) 0 0
Level 1 | Cross-currency swap | Short-term    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Foreign currency option contracts (asset) 0 0
Level 2    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Cash and cash equivalents 0 0
Short-term debt 187 114
Long-term debt 720 771
Level 2 | Foreign exchange forward contracts    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Foreign exchange forward contracts (other liabilities) 0 0
Foreign currency option contracts (asset) 3 2
Level 2 | Foreign currency option contracts | Short-term    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Foreign currency option contracts (asset) 0 0
Level 2 | Cross-currency swap | Short-term    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Foreign currency option contracts (asset) 11 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 exchange forward contracts (other liabilities) 0 0
Foreign currency option contracts (asset) 0 0
Level 3 | Foreign currency option contracts | Short-term    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Foreign currency option contracts (asset) 0 0
Level 3 | Cross-currency swap | Short-term    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Foreign currency option contracts (asset) $ 0 $ 0