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FINANCIAL INSTRUMENTS AND FAIR VALUE MEASUREMENTS (Narrative) (Details)
$ in Millions
6 Months Ended
Dec. 31, 2017
USD ($)
instrument
Sep. 30, 2017
USD ($)
Jun. 30, 2017
USD ($)
instrument
Derivative [Line Items]      
Maximum duration, foreign exchange contracts 2 years    
Number of interest rate derivatives held | instrument 0   0
Estimated amount of the existing net gain (loss) to be reclassified into earnings in the next 12 months $ (4)    
Derivative instruments subject to contractually defined counterparty liability position limits $ 0   $ 1
Interest Rate Contract [Member]      
Derivative [Line Items]      
Notional amounts   $ 200  
Total Commodity Purchase Derivative Contracts [Member]      
Derivative [Line Items]      
Maximum duration, commodity contracts 2 years    
Notional amounts $ 21   26
Cash margin balances amount 0   1
Jet Fuel Swaps [Member]      
Derivative [Line Items]      
Notional amounts 11   14
Soybean Oil Futures [Member]      
Derivative [Line Items]      
Notional amounts 10   12
Purchases of Inventory [Member] | Foreign Exchange Contract [Member]      
Derivative [Line Items]      
Notional amounts $ 35   $ 49