BASIS OF PRESENTATION AND RECENT ACCOUNTING PRONOUNCEMENTS (Details) - USD ($) $ in Millions	3 Months Ended
	Aug. 31, 2015	Aug. 31, 2014
Acquisition Related and Other Expenses [Abstract]
Transitional and other employee related costs	$ 24	$ 9
Stock-based compensation	3	3
Professional fees and other, net	4	13
Total acquisition related and other expenses	31	25
Non-Operating Income, net [Abstract]
Interest income	117	89
Foreign currency losses, net	(25)	(41)
Noncontrolling interests in income	(30)	(46)
Other (loss) income, net	(32)	14
Total non-operating income, net	30	16
Sales of Financing Receivables [Narrative] [Abstract]
Sales of financing receivables	$ 972	$ 724