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INCOME TAXES (Details) - USD ($) $ in Billions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Nov. 30, 2020 | Nov. 30, 2019 | Nov. 30, 2020 | Nov. 30, 2019 | May 31, 2020
Income Tax Disclosure [Abstract] |  |  |  |  |
Effective income tax rate | 17.80% | 17.70% | 15.70% | 16.00% |
Deferred Tax Assets, Net [Abstract] |  |  |  |  |
Net deferred tax assets | $ 3.4 |  | $ 3.4 |  | $ 3.2

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