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FAIR VALUE MEASUREMENTS (Details) - USD ($) $ in Millions | May 31, 2019 | May 31, 2018
--- | --- | ---
Assets [Abstract] |  |
Derivative financial instruments | $ 5 | $ 29
Total assets | 27,947 | 52,478
Liabilities [Abstract] |  |
Derivative financial instruments | 230 | 158
Commercial Paper Debt Securities [Member] |  |
Assets [Abstract] |  |
Investments and cash and cash equivalents | 0 | 1,647
Money Market Funds [Member] |  |
Assets [Abstract] |  |
Investments and cash and cash equivalents | 5,700 | 6,500
Corporate Debt Securities and Other [Member] |  |
Assets [Abstract] |  |
Investments and cash and cash equivalents | 22,242 | 44,302
Fair Value Measurements Using Input Types Level 1 [Member] |  |
Assets [Abstract] |  |
Derivative financial instruments | 0 | 0
Total assets | 10,599 | 6,723
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 | 5,700 | 6,500
Fair Value Measurements Using Input Types Level 1 [Member] | Corporate Debt Securities and Other [Member] |  |
Assets [Abstract] |  |
Investments and cash and cash equivalents | 4,899 | 223
Fair Value Measurements Using Input Types Level 2 [Member] |  |
Assets [Abstract] |  |
Derivative financial instruments | 5 | 29
Total assets | 17,348 | 45,755
Liabilities [Abstract] |  |
Derivative financial instruments | 230 | 158
Fair Value Measurements Using Input Types Level 2 [Member] | Commercial Paper Debt Securities [Member] |  |
Assets [Abstract] |  |
Investments and cash and cash equivalents | 0 | 1,647
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 | $ 17,343 | $ 44,079

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