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BASIS OF PRESENTATION, RECENT ACCOUNTING PRONOUNCEMENTS AND OTHER Narrative (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Nov. 30, 2020 | Nov. 30, 2019 | Nov. 30, 2020 | Nov. 30, 2019
Contract with Customer, Asset and Liability [Abstract] |  |  |  |
Revenues recognized included in opening deferred revenues balances |  |  | $ 5,900 | $ 6,200
Revenue, Performance Obligation [Abstract] |  |  |  |
Remaining Performance Obligation, Amount, Total | $ 34,400 |  | $ 34,400 |
Remaining Performance Obligation, Percentage, to be recognized in the next twelve months | 60.00% |  | 60.00% |
Sales of Financing Receivables [Abstract] |  |  |  |
Sales of financing receivables | $ 300 | $ 196 | $ 977 | $ 876

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