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DERIVATIVE FINANCIAL INSTRUMENTS (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
May 31, 2013
May 31, 2012
May 31, 2011
Foreign Currency Forward Contracts Not Designated as Hedges (Narrative) [Abstract]      
Notional amount of foreign currency forward contracts to purchase US Dollars $ 3,000 $ 3,000  
Notional amount of foreign currency forward contracts to sell US Dollars 1,100 873  
Net (losses) gains related to forward contracts (64) 43 (39)
Interest Rate Swap Agreements (Narrative) [Abstract]      
Fair value of interest rate swap agreements recorded as other assets $ 41 $ 69