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DERIVATIVE FINANCIAL INSTRUMENTS (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Aug. 31, 2012
Aug. 31, 2011
May 31, 2012
Foreign Currency Forward Contracts Not Designated as Hedges (Narrative) [Abstract]      
Notional amount of foreign currency forward contracts to purchase US Dollars $ 3,100   $ 3,000
Notional amount of foreign currency forward contracts to sell US Dollars 863   873
Net losses related to forward contracts included in our non-operating income (expense), net 33 17  
Interest Rate Swap Agreements (Narrative) [Abstract]      
Fair value of interest rate swap agreements recorded as other assets $ 65   $ 69