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Financial Instruments - Fair Value of Financial Instruments (Details) - USD ($)
$ in Millions
Jun. 30, 2017
Sep. 30, 2016
Carrying Value    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Cash and cash equivalents $ 231 $ 160
Short-term debt 132 14
Long-term debt 858 982
Carrying Value | Foreign exchange forward contracts    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Foreign exchange forward contracts (other assets) 0 1
Foreign exchange forward contracts (other liabilities) 0 2
Carrying Value | Foreign currency option contracts    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Short-term foreign currency option contracts (other assets) 1 0
Long-term foreign currency option contracts (other assets) 1 2
Fair Value    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Cash and cash equivalents 231 160
Short-term debt 245 14
Long-term debt 912 1,051
Fair Value | Foreign exchange forward contracts    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Foreign exchange forward contracts (other assets) 0 1
Foreign exchange forward contracts (other liabilities) 0 2
Fair Value | Foreign currency option contracts    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Short-term foreign currency option contracts (other assets) 1 0
Long-term foreign currency option contracts (other assets) $ 1 $ 2