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FINANCIAL INSTRUMENTS AND FAIR VALUE MEASUREMENTS (Narrative) (Details) | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | ---
Jun. 30, 2020 USD ($) | May 31, 2020 USD ($) | Jun. 30, 2019 USD ($) instrument | May 31, 2018 USD ($) | Sep. 30, 2017 USD ($)
Derivative [Line Items] |  |  |  |  |
Maximum contract duration | 2 years |  |  |  |
Maximum duration, interest rate contracts | 3 years |  |  |  |
Settlement of interest rate forward contracts | instrument |  |  | 0 |  |
Cash flow hedge gain (loss) to be reclassified within twelve months | $ (11,000,000) |  |  |  |
Derivative Instruments Subject To Contractually Defined Counterparty Liability Position Limits | 3,000,000 |  | $ 1,000,000 |  |
Interest Rate Forward Contract [Member] |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Derivative, notional amount | $ 225,000,000 |  |  |  |
Amortization period of settlement payment | 10 years |  |  |  |
Total Commodity Purchase Derivative Contracts [Member] |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Maximum duration, commodity contracts | 2 years |  |  |  |
Derivative, notional amount | $ 27,000,000 |  | 24,000,000 |  |
Jet Fuel Swaps [Member] |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Derivative, notional amount | 13,000,000 |  | 11,000,000 |  |
Soybean Oil Futures [Member] |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Derivative, notional amount | 14,000,000 |  | 13,000,000 |  |
Soybean Oil Futures [Member] | Commodity Contract [Member] |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Cash margin balances amount | 2,000,000 |  | 1,000,000 |  |
Purchases of Inventory [Member] | Foreign Exchange Contract [Member] |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Derivative, notional amount | 70,000,000 |  | $ 61,000,000 |  |
Other Assets [Member] | Reported Value Measurement [Member] | Fair Value, Inputs, Level 1 [Member] | Trust Assets for nonqualified deferred compensation plans [Member] |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Increase in deferred compensation plan | 4,000,000 |  |  |  |
Senior Long-Term Notes And Debentures; 1.80%, $500 Due May 2030 |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Face value | 500,000,000 | $ 500,000,000 |  |  |
Senior Long-Term Notes And Debentures; 3.10%, $400 Due October 2027 [Member] |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Face value | 400,000,000 |  |  |  | $ 400,000,000
Senior Long-Term Notes And Debentures; 3.90%, $500 Due May 2028 [Member] |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Face value | $ 500,000,000 |  |  | $ 500,000,000 |

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