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FAIR VALUE MEASUREMENTS Narrative (Details) - USD ($) $ in Millions | May 31, 2019 | May 31, 2018
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Marketable security investments maturity information [Abstract] |  |
Total debt, carrying value | $ 56,342 | $ 60,927
Senior notes [Member] |  |
Marketable security investments maturity information [Abstract] |  |
Total debt, carrying value | 56,100 | 58,000
Fair Value Measurements Using Input Types Level 2 [Member] | Senior notes [Member] |  |
Marketable security investments maturity information [Abstract] |  |
Total debt, fair value | $ 58,400 | $ 59,000

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