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FAIR VALUE MEASUREMENTS (Details) - USD ($) $ in Millions | Nov. 30, 2020 | May 31, 2020
--- | --- | ---
Assets [Abstract] |  |
Derivative financial instruments | $ 72 | $ 29
Total assets | 23,899 | 30,881
Liabilities [Abstract] |  |
Derivative financial instruments | 137 | 268
Commercial Paper Debt Securities [Member] |  |
Assets [Abstract] |  |
Investments and cash and cash equivalents | 4,356 | 5,640
Money Market Funds [Member] |  |
Assets [Abstract] |  |
Investments and cash and cash equivalents | 11,246 | 18,587
Corporate Debt Securities and Other [Member] |  |
Assets [Abstract] |  |
Investments and cash and cash equivalents | 8,225 | 6,625
Fair Value Measurements Using Input Types Level 1 [Member] |  |
Assets [Abstract] |  |
Derivative financial instruments | 0 | 0
Total assets | 12,983 | 22,623
Liabilities [Abstract] |  |
Derivative financial instruments | 0 | 0
Fair Value Measurements Using Input Types Level 1 [Member] | Commercial Paper Debt Securities [Member] |  |
Assets [Abstract] |  |
Investments and cash and cash equivalents | 0 | 0
Fair Value Measurements Using Input Types Level 1 [Member] | Money Market Funds [Member] |  |
Assets [Abstract] |  |
Investments and cash and cash equivalents | 11,246 | 18,587
Fair Value Measurements Using Input Types Level 1 [Member] | Corporate Debt Securities and Other [Member] |  |
Assets [Abstract] |  |
Investments and cash and cash equivalents | 1,737 | 4,036
Fair Value Measurements Using Input Types Level 2 [Member] |  |
Assets [Abstract] |  |
Derivative financial instruments | 72 | 29
Total assets | 10,916 | 8,258
Liabilities [Abstract] |  |
Derivative financial instruments | 137 | 268
Fair Value Measurements Using Input Types Level 2 [Member] | Commercial Paper Debt Securities [Member] |  |
Assets [Abstract] |  |
Investments and cash and cash equivalents | 4,356 | 5,640
Fair Value Measurements Using Input Types Level 2 [Member] | Money Market Funds [Member] |  |
Assets [Abstract] |  |
Investments and cash and cash equivalents | 0 | 0
Fair Value Measurements Using Input Types Level 2 [Member] | Corporate Debt Securities and Other [Member] |  |
Assets [Abstract] |  |
Investments and cash and cash equivalents | $ 6,488 | $ 2,589

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