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FINANCIAL INSTRUMENTS - Changes in Fair Value of Level 3 Financial Assets and Liabilities (Details) - Level 3 - USD ($)
$ in Millions
12 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]    
Fair Value, beginning balance $ 0 $ 3
Purchases, issuances, sales and settlements:    
Purchases 0 0
Settlements (1) (2)
Transfer in and / or out of Level 3 0 0
Reclass between short-term and long-term 0 0
Fair Value, ending balance 0 0
Foreign Currency Option Contracts | Other Current Assets    
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]    
Fair Value, beginning balance 0 2
Purchases, issuances, sales and settlements:    
Purchases 0 0
Settlements (1) (2)
Transfer in and / or out of Level 3 0 0
Reclass between short-term and long-term 0 0
Fair Value, ending balance 0 0
Foreign Currency Option Contracts | Other Noncurrent Assets    
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]    
Fair Value, beginning balance 0 1
Purchases, issuances, sales and settlements:    
Purchases 0 0
Settlements 0 0
Transfer in and / or out of Level 3 0 0
Reclass between short-term and long-term 0 0
Fair Value, ending balance 0 0
Other Income    
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]    
Total unrealized gains (losses) (1) 0
Total realized gains (losses) 1 1
Other Income | Foreign Currency Option Contracts | Other Current Assets    
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]    
Total unrealized gains (losses) (1) 0
Total realized gains (losses) 1 1
Other Income | Foreign Currency Option Contracts | Other Noncurrent Assets    
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]    
Total unrealized gains (losses) 0 0
Total realized gains (losses) 0 0
Cost of Sales    
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]    
Total unrealized gains (losses) 1 (2)
Total realized gains (losses) 0 0
Cost of Sales | Foreign Currency Option Contracts | Other Current Assets    
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]    
Total unrealized gains (losses) 1 (1)
Total realized gains (losses) 0 0
Cost of Sales | Foreign Currency Option Contracts | Other Noncurrent Assets    
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]    
Total unrealized gains (losses) 0 (1)
Total realized gains (losses) $ 0 $ 0