BASIS OF PRESENTATION AND RECENT ACCOUNTING PRONOUNCEMENTS (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Nov. 30, 2015	Nov. 30, 2014	Nov. 30, 2015	Nov. 30, 2014	May. 31, 2015
Acquisition Related and Other Expenses [Abstract]
Transitional and other employee related costs	$ 8	$ 23	$ 33	$ 32
Stock-based compensation		1	3	4
Professional fees and other, net	4	(44)	9	(32)
Business combination adjustments, net	(19)		(20)
Total acquisition related and other expenses	(7)	(20)	25	4
Benefit related to certain litigation		53		53
Acquisiiton related benefit	19		19
Non-Operating Income, net [Abstract]
Interest income	123	79	240	168
Foreign currency losses, net	(28)	(32)	(53)	(73)
Noncontrolling interests in income	(29)	(37)	(59)	(83)
Other income (loss), net	18	(1)	(14)	13
Total non-operating income, net	84	9	114	25
Sales of Financing Receivables [Narrative] [Abstract]
Sales of financing receivables	$ 228	$ 197	$ 1,200	$ 921
ASU 2015-17 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Current deferred tax assets					$ 663
Current deferred tax liabilities					$ 85