BASIS OF PRESENTATION, RECENT ACCOUNTING PRONOUNCEMENTS AND OTHER Narrative (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Feb. 28, 2022	Feb. 28, 2021	Feb. 28, 2022	Feb. 28, 2021	May 31, 2021
Organization Consolidation And Presentation Of Financial Statements [Abstract]
Litigation related charges			$ 4,700
Total net tax benefit		$ 2,300		$ 2,300
Contract with Customer, Asset and Liability [Abstract]
Revenues recognized included in opening deferred revenues balances			8,100	7,400
Revenue, Performance Obligation [Abstract]
Remaining performance obligation, amount	$ 38,500		38,500
Sales of Financing Receivables [Abstract]
Sales of financing receivables	352	$ 338	1,400	$ 1,300
Equity Securities, FV-NI and without Readily Determinable Fair Value [Abstract]
Non-marketable debt investments and equity securities and related instruments	$ 1,300		$ 1,300		$ 971