DERIVATIVE FINANCIAL INSTRUMENTS Narrative (Details) - USD ($) $ in Billions	May 31, 2020	May 31, 2019
Forward contracts held to purchase U.S. Dollars [Member] | Foreign Currency Forward Contracts Not Designated as Hedges [Member]
Foreign Currency Forward Contracts Not Designated as Hedges (Narrative) [Abstract]
Notional amounts of forward contracts	$ 4.2	$ 3.8
Forward contracts held to sell U.S. Dollars [Member] | Foreign Currency Forward Contracts Not Designated as Hedges [Member]
Foreign Currency Forward Contracts Not Designated as Hedges (Narrative) [Abstract]
Notional amounts of forward contracts	3.9	$ 3.3
Cash flow hedges [Member] | Cross-Currency Swap Agreements [Member]
Debt Instruments [Abstract]
Senior notes fixed principal amount	$ 1.6
Senior notes fixed annual interest rate	3.53%