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Financial Instruments - Fair Value of Financial Instruments (Details) - USD ($)
$ in Millions
Dec. 31, 2017
Sep. 30, 2017
Carrying Value    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Cash and cash equivalents $ 116 $ 88
Short-term debt 63 288
Long-term debt 751 750
Carrying Value | 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 (other liabilities) 3 3
Carrying Value | Foreign currency option contracts    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Short-term foreign currency option contracts (other assets) 2 2
Long-term foreign currency option contracts (other assets) 1 1
Fair Value    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Cash and cash equivalents 116 88
Short-term debt 92 329
Long-term debt 851 859
Fair Value | 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 (other liabilities) 3 3
Fair Value | Foreign currency option contracts    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Short-term foreign currency option contracts (other assets) 2 2
Long-term foreign currency option contracts (other assets) $ 1 $ 1