VALUATION AND QUALIFYING ACCOUNTS (Details) - USD ($) $ in Millions	12 Months Ended
	May 31, 2021	May 31, 2020	May 31, 2019
Allowances for Doubtful Trade Receivables [Abstract]
Beginning Balance	$ 409	$ 371	$ 370
Additions Charged to Operations or Other Accounts	192	245	190
Write-offs	(243)	(195)	(188)
Translation Adjustments and Other	15	(12)	(1)
Ending Balance	$ 373	$ 409	$ 371