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FINANCIAL INSTRUMENTS - Fair Value of Financial Instruments (Details) - USD ($)
$ in Millions
Sep. 30, 2017
Sep. 30, 2016
Carrying Value    
Fair Value    
Cash and cash equivalents $ 88 $ 160
Short-term debt 288 14
Long-term debt 750 982
Fair Value    
Fair Value    
Cash and cash equivalents 88 160
Short-term debt 329 14
Long-term debt 859 1,051
Foreign Exchange Forward | Carrying Value    
Fair Value    
Foreign exchange forward contracts (other assets) 0 1
Foreign exchange forward contracts (other liabilities) 3 2
Foreign Exchange Forward | Fair Value    
Fair Value    
Foreign exchange forward contracts (other assets) 0 1
Foreign exchange forward contracts (other liabilities) 3 2
Foreign Currency Option Contracts | Carrying Value    
Fair Value    
Short-term foreign currency option contracts (other assets) 2 0
Long-term foreign currency option contracts (other assets) 1 2
Foreign Currency Option Contracts | Fair Value    
Fair Value    
Short-term foreign currency option contracts (other assets) 2 0
Long-term foreign currency option contracts (other assets) $ 1 $ 2