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DERIVATIVE FINANCIAL INSTRUMENTS (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Feb. 28, 2013	Feb. 29, 2012	Feb. 28, 2013	Feb. 29, 2012	May 31, 2012
Foreign Currency Forward Contracts Not Designated as Hedges (Narrative) [Abstract]
Notional amounts of foreign currency forward contracts to purchase US Dollars	$ 3,200		$ 3,200		$ 3,000
Notional amounts of foreign currency forward contracts to sell US Dollars	1,200		1,200		873
Net losses related to forward contracts	22	128	73	30
Interest Rate Swap Agreements [Line Items]
Fair value of interest rate swap agreements recorded as other assets	$ 50		$ 50		$ 69
3.75% July 2014 Notes [Member]
Interest Rate Swap Agreements [Line Items]
Stated interest rate percentage	3.75%		3.75%
Debt maturity date			Jul. 08, 2014