VALUATION AND QUALIFYING ACCOUNTS (Details) - USD ($) $ in Millions	12 Months Ended
	May 31, 2020	May 31, 2019	May 31, 2018
Allowances for Doubtful Trade Receivables [Abstract]
Beginning Balance	$ 371	$ 370	$ 319
Additions Charged to Operations or Other Accounts	245	190	146
Write-offs	(195)	(188)	(98)
Translation Adjustments and Other	(12)	(1)	3
Ending Balance	$ 409	$ 371	$ 370