FINANCIAL INSTRUMENTS AND FAIR VALUE MEASUREMENTS (Narrative) (Details) $ in Millions	6 Months Ended
Dec. 31, 2018 USD ($) instrument	Jun. 30, 2018 USD ($) instrument
Derivative [Line Items]
Maximum duration, foreign exchange contracts	2 years
Maximum duration, interest rate contracts	12 months
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	$ (8)
Derivative instruments subject to contractually defined counterparty liability position limits	$ 1	$ 0
Total Commodity Purchase Derivative Contracts [Member]
Derivative [Line Items]
Maximum duration, commodity contracts	2 years
Notional amounts	$ 34	34
Cash margin balances amount	2	2
Jet Fuel Swaps [Member]
Derivative [Line Items]
Notional amounts	11	10
Soybean Oil Futures [Member]
Derivative [Line Items]
Notional amounts	23	24
Purchases of Inventory [Member] \| Foreign Exchange Contract [Member]
Derivative [Line Items]
Notional amounts	$ 43	$ 50

Derivative instruments subject to contractually defined counterparty liability position limits.

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Aggregate notional amount specified by the derivative(s). Expressed as an absolute value.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Article 12
-Section 13
-Sentence Column B

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The estimated net amount of existing gains or losses on cash flow hedges at the reporting date expected to be reclassified to earnings within the next 12 months.

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-Section 50
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The amount of cash or securities placed with a broker or counterparty as security for a trading or derivatives securities position which was partially obtained with funds provided by the broker dealer.

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Maximum period of time the entity is hedging its exposure to variability in future cash flows for forecasted transactions, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Excludes forecasted transactions related to payment of variable interest on existing financial instruments.

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Maximum length of time over which the entity is hedging its exposure to the variability in future cash flows for forecasted transactions, excluding those forecasted transactions related to the payment of variable interest on existing financial instruments, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Number of interest rate derivative instruments held by the entity at the reporting date.

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