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DERIVATIVES FINANCIAL INSTRUMENTS (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended
Nov. 30, 2013
May 31, 2013
Nov. 30, 2013
2.25% senior notes due January 2021 [Member]
Nov. 30, 2013
Interest rate swap agreements [Member]
Interest expense [Member]
Nov. 30, 2012
Interest rate swap agreements [Member]
Interest expense [Member]
Nov. 30, 2013
Interest rate swap agreements [Member]
Interest expense [Member]
Nov. 30, 2012
Interest rate swap agreements [Member]
Interest expense [Member]
Nov. 30, 2013
Cash flow hedges [Member]
Cross-currency swap agreements [Member]
Nov. 30, 2013
Cash flow hedges [Member]
Cross-currency swap agreements [Member]
Nov. 30, 2013
Cash flow hedges [Member]
Cross-currency swap agreements [Member]
2.25% senior notes due January 2021 [Member]
Nov. 30, 2013
Cash flow hedges [Member]
Cross-currency swap agreements [Member]
Non-operating income, net [Member]
Nov. 30, 2013
Cash flow hedges [Member]
Cross-currency swap agreements [Member]
Non-operating income, net [Member]
Nov. 30, 2013
Cash flow hedges [Member]
Cross-currency swap agreements [Member]
Other assets [Member]
Nov. 30, 2013
Net investment hedge [Member]
Foreign currency borrowings [Member]
Nov. 30, 2013
Net investment hedge [Member]
Foreign currency borrowings [Member]
Nov. 30, 2013
Net investment hedge [Member]
Foreign currency borrowings [Member]
Notes payable and other non-current borrowings [Member]
Nov. 30, 2013
Fair value hedges [Member]
Interest rate swap agreements [Member]
Other assets [Member]
May 31, 2013
Fair value hedges [Member]
Interest rate swap agreements [Member]
Other assets [Member]
Nov. 30, 2013
Fair value hedges [Member]
Interest rate swap agreements [Member]
Prepaid expenses and other current assets [Member]
Fair Values of Derivative and Non-Derivative Instruments Designated as Hedges in Condensed Consolidated Balance Sheets [Abstract]                                      
Fair value, assets $ 88 $ 41                     $ 48       $ 15 $ 41 $ 25
Fair value, debt                               (1,040)      
Effects of Derivative and Non-Derivative Instruments Designated as Hedges on Income and Other Comprehensive Loss (OCL) [Abstract]                                      
Amount of Gain (Loss) Recognized in Accumulated OCL (Effective Portion)               46 48         (14) (27)        
Amount of Gain Reclassified from Accumulated OCL into Income (Effective Portion)                     22 56              
Amount of Gain (Loss) Recognized in Income on Derivative       22 (8) (1) (12)                        
Amount of (Loss) Gain on Hedged Item Recognized in Income Attributable to Risk Being Hedged       (22) 8 1 12                        
Cross Currency Swap Agreements [Abstract]                                      
Senior notes fixed principal amount     $ 1,600             $ 1,600                  
Annual interest rate for the 2.25% notes due January 2021 after the economic effect of the cross-currency swaps     3.53%             3.53%