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Financial Instruments - Fair Value of Financial Instruments (Details) - USD ($)
$ in Millions
Dec. 31, 2018
Sep. 30, 2018
Carrying Value    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Cash and cash equivalents $ 127 $ 115
Short-term debt 172 94
Long-term debt 731 730
Carrying Value | Foreign exchange forward contracts    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Foreign exchange forward contracts (other assets) 3 2
Foreign exchange forward contracts (other liabilities) 0 0
Carrying Value | Foreign currency option contracts    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Foreign exchange forward contracts (other assets) 0 0
Carrying Value | Cross-currency swap    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Foreign exchange forward contracts (other assets) 11 6
Fair Value    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Cash and cash equivalents 127 115
Short-term debt 189 116
Long-term debt 725 776
Fair Value | Foreign exchange forward contracts    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Foreign exchange forward contracts (other assets) 3 2
Foreign exchange forward contracts (other liabilities) 0 0
Fair Value | Foreign currency option contracts    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Foreign exchange forward contracts (other assets) 0 0
Fair Value | Cross-currency swap    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Foreign exchange forward contracts (other assets) $ 11 $ 6