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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

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