VALUATION AND QUALIFYING ACCOUNTS (Details) - USD ($) $ in Millions	12 Months Ended
	May. 31, 2015	May. 31, 2014	May. 31, 2013
Allowances for Doubtful Trade Receivables [Abstract]
Beginning Balance	$ 306	$ 296	$ 323
Additions Charged to Operations or Other Accounts	56	122	118
Write-offs	(86)	(120)	(167)
Translation Adjustments and Other	9	8	22
Ending Balance	$ 285	$ 306	$ 296