DERIVATIVE FINANCIAL INSTRUMENTS (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Nov. 30, 2015	Nov. 30, 2014	Nov. 30, 2015	Nov. 30, 2014	May. 31, 2015
Foreign Currency Forward Contracts Not Designated as Hedges (Narrative) [Abstract]
Net gains (losses) related to forward contracts	$ (27)	$ 66	$ 70	$ 35
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	2,400		2,400		$ 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	$ 1,100		$ 1,100		$ 1,200