DERIVATIVE FINANCIAL INSTRUMENTS Narrative Continued (Details) (Foreign Currency Forward Contracts Not Designated as Hedges [Member], USD $) In Millions, unless otherwise specified	3 Months Ended
	Aug. 31, 2013	Aug. 31, 2012	Aug. 31, 2013 Forward contracts held to purchase U.S. dollars [Member]	May 31, 2013 Forward contracts held to purchase U.S. dollars [Member]	Aug. 31, 2013 Forward contracts held to sell U.S. dollars [Member]	May 31, 2013 Forward contracts held to sell U.S. dollars [Member]
Foreign Currency Forward Contracts Not Designated as Hedges (Narrative) [Abstract]
Notional amounts of forward contracts			$ 2,800	$ 3,000	$ 768	$ 1,100
Net gains (losses) related to forward contracts	$ 68	$ (33)