DERIVATIVE FINANCIAL INSTRUMENTS (Details) - USD ($) $ in Millions	12 Months Ended
	May 31, 2016	May 31, 2015	May 31, 2014
Foreign Currency Forward Contracts Not Designated as Hedges (Narrative) [Abstract]
Net gains (losses) related to forward contracts	$ 97	$ 60	$ (69)
Foreign Currency Forward Contracts Not Designated as Hedges [Member] | Forward contracts held to purchase U.S. Dollars [Member]
Foreign Currency Forward Contracts Not Designated as Hedges (Narrative) [Abstract]
Notional amounts of forward contracts	2,700	2,200
Foreign Currency Forward Contracts Not Designated as Hedges [Member] | Forward contracts held to sell U.S. Dollars [Member]
Foreign Currency Forward Contracts Not Designated as Hedges (Narrative) [Abstract]
Notional amounts of forward contracts	$ 2,000	$ 1,200