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