NOTES PAYABLE AND OTHER BORROWINGS Narrative (Details)	12 Months Ended
	May. 31, 2015
Notes Payable and Other Borrowings (Narrative) [Abstract]
Debt-related covenants	We were in compliance with all debt-related covenants at May 31, 2015.
Debt instrument redemption description	We may redeem some or all of the Senior Notes of each series prior to their maturity, subject to certain restrictions, and the payment of an applicable make-whole premium in certain instances. The 2017 Floating Rate Notes, January 2019 Floating Rate Notes and 2019 Floating Rate Notes (collectively the Floating Rate Notes) may not be redeemed prior to their maturity.
Revolving Credit Agreement	In April 2013, we entered into a $3.0 billion Revolving Credit Agreement with Wells Fargo Bank, N.A., Bank of America, N.A., BNP Paribas, JPMorgan Chase Bank, N.A. and certain other lenders (the 2013 Credit Agreement). The 2013 Credit Agreement provides for an unsecured 5-year revolving credit facility to be used for general corporate purposes including back-stopping any commercial paper notes that we may issue. Subject to certain conditions stated in the 2013 Credit Agreement, we may borrow, prepay and re-borrow amounts under the 2013 Credit Agreement at any time during the term of the 2013 Credit Agreement. Interest under the 2013 Credit Agreement is based on either (a) a LIBOR-based formula or (b) the Base Rate formula, each as set forth in the 2013 Credit Agreement. Any amounts drawn pursuant to the 2013 Credit Agreement are due on April 20, 2018. The 2013 Credit Agreement contains certain customary representations and warranties, covenants and events of default, including the requirement that our total net debt to total capitalization ratio not exceed 45% on a consolidated basis. If any of the events of default occur and are not cured within applicable grace periods or waived, any unpaid amounts under the 2013 Credit Agreement may be declared immediately due and payable and the 2013 Credit Agreement may be terminated.