DERIVATIVES FINANCIAL INSTRUMENTS (Details) 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						6 Months Ended
	Nov. 30, 2014 USD ($)	Jul. 08, 2014 USD ($)	May 31, 2014 USD ($)	Nov. 30, 2014 Interest rate swap agreements [Member] Interest expense [Member] USD ($)	Nov. 30, 2013 Interest rate swap agreements [Member] Interest expense [Member] USD ($)	Nov. 30, 2014 Interest rate swap agreements [Member] Interest expense [Member] USD ($)	Nov. 30, 2013 Interest rate swap agreements [Member] Interest expense [Member] USD ($)	Nov. 30, 2014 Cash flow hedges [Member] Cross-currency swap agreements [Member] USD ($)	Nov. 30, 2013 Cash flow hedges [Member] Cross-currency swap agreements [Member] USD ($)	Nov. 30, 2014 Cash flow hedges [Member] Cross-currency swap agreements [Member] USD ($)	Nov. 30, 2013 Cash flow hedges [Member] Cross-currency swap agreements [Member] USD ($)	Nov. 30, 2014 Cash flow hedges [Member] Cross-currency swap agreements [Member] 2.25% senior notes due January 2021 [Member] USD ($)	Jul. 10, 2013 Cash flow hedges [Member] Cross-currency swap agreements [Member] 2.25% senior notes due January 2021 [Member] EUR (€)	Nov. 30, 2014 Cash flow hedges [Member] Cross-currency swap agreements [Member] Non-operating income, net [Member] USD ($)	Nov. 30, 2013 Cash flow hedges [Member] Cross-currency swap agreements [Member] Non-operating income, net [Member] USD ($)	Nov. 30, 2014 Cash flow hedges [Member] Cross-currency swap agreements [Member] Non-operating income, net [Member] USD ($)	Nov. 30, 2013 Cash flow hedges [Member] Cross-currency swap agreements [Member] Non-operating income, net [Member] USD ($)	May 31, 2014 Cash flow hedges [Member] Cross-currency swap agreements [Member] Other assets [Member] USD ($)	Nov. 30, 2014 Cash flow hedges [Member] Cross-currency swap agreements [Member] Other non-current liabilities [Member] USD ($)	Nov. 30, 2014 Net investment hedge [Member] Foreign currency borrowings [Member] USD ($)	Nov. 30, 2013 Net investment hedge [Member] Foreign currency borrowings [Member] USD ($)	Nov. 30, 2014 Net investment hedge [Member] Foreign currency borrowings [Member] USD ($)	Nov. 30, 2013 Net investment hedge [Member] Foreign currency borrowings [Member] USD ($)	Nov. 30, 2014 Net investment hedge [Member] Foreign currency borrowings [Member] 3.125% senior notes due July 2025 [Member]	Jul. 10, 2013 Net investment hedge [Member] Foreign currency borrowings [Member] 3.125% senior notes due July 2025 [Member] EUR (€)	Nov. 30, 2014 Net investment hedge [Member] Foreign currency borrowings [Member] Notes payable and other non-current borrowings [Member] USD ($)	May 31, 2014 Net investment hedge [Member] Foreign currency borrowings [Member] Notes payable and other non-current borrowings [Member] USD ($)	Nov. 30, 2014 Fair value hedges [Member] Interest rate swap agreements [Member] 2.375% senior notes due January 2019 [Member]	Jul. 16, 2013 Fair value hedges [Member] Interest rate swap agreements [Member] 2.375% senior notes due January 2019 [Member] USD ($)	Nov. 30, 2014 Fair value hedges [Member] Interest rate swap agreements [Member] Other assets [Member] USD ($)	May 31, 2014 Fair value hedges [Member] Interest rate swap agreements [Member] Other assets [Member] USD ($)	May 31, 2014 Fair value hedges [Member] Interest rate swap agreements [Member] Prepaid expenses and other current assets [Member] USD ($)
Fair Values of Derivative and Non-Derivative Instruments Designated as Hedges in Condensed Consolidated Balance Sheets [Abstract]
Fair value, assets	$ 45		$ 97															$ 74												$ 45	$ 15	$ 8
Fair value, liabilities	(39)																		(39)
Fair value, debt																										(1,088)	(1,116)
Effects of Derivative and Non-Derivative Instruments Designated as Hedges on Income and Other Comprehensive Income (OCI) or Loss (OCL) [Abstract]
Amount of (Loss) Gain Recognized in Accumulated OCI or OCL (Effective Portion)								(96)	46	(113)	48									57	(14)	89	(27)
Amount of (Loss) Gain Reclassified from Accumulated OCI or OCL into Income (Effective Portion)														(96)	22	(149)	56
Amount of Gain (Loss) Recognized in Income on Derivative				38	22	22	(1)
Amount of (Loss) Gain on Hedged Item Recognized in Income Attributable to Risk Being Hedged				(38)	(22)	(22)	1
Debt Instruments [Abstract]
Total debt issued		10,000											1,250												750				1,500
Senior notes fixed principal amount												1,600
Annual interest rate for the 2.25% notes due January 2021 after the economic effect of the cross-currency swaps												3.53%
Stated interest rate percentage												2.25%												3.125%				2.375%
Maturity date												Jan. 10, 2021												Jul. 10, 2025				Jan. 15, 2019
Derivative Instrument Detail [Abstract]
Amount of ineffectiveness measured										$ 0												$ 0