BASIS OF PRESENTATION, RECENT ACCOUNTING PRONOUNCEMENTS AND OTHER Narrative (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Nov. 30, 2021	Nov. 30, 2020	Nov. 30, 2021	Nov. 30, 2020
Contract with Customer, Asset and Liability [Abstract]
Revenues recognized included in opening deferred revenues balances			$ 6,500	$ 5,900
Revenue, Performance Obligation [Abstract]
Remaining performance obligation, amount	$ 37,200		37,200
Sales of Financing Receivables [Abstract]
Sales of financing receivables	$ 351	$ 300	$ 1,000	$ 977