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Financial Instruments - Fair Value of Financial Instruments by Valuation Hierarchy (Details) - USD ($)
$ in Millions
Dec. 31, 2017
Sep. 30, 2017
Level 1    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Cash and cash equivalents $ 116 $ 88
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 assets) 0 0
Foreign exchange forward contracts (liability) 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 | Foreign currency option contracts | Long-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 88 325
Long-term debt 843 851
Level 2 | Foreign exchange forward contracts    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Foreign exchange forward contracts (other assets) 0 0
Foreign exchange forward contracts (liability) 3 3
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 | Foreign currency option contracts | Long-term    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Foreign currency option contracts (asset) 0 0
Level 3    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Cash and cash equivalents 0 0
Short-term debt 4 4
Long-term debt 8 8
Level 3 | Foreign exchange forward contracts    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Foreign exchange forward contracts (other assets) 0 0
Foreign exchange forward contracts (liability) 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) 2 2
Level 3 | Foreign currency option contracts | Long-term    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Foreign currency option contracts (asset) $ 1 $ 1