FAIR VALUE MEASUREMENTS (Details) - USD ($) $ in Millions	Feb. 29, 2020	May 31, 2019
Assets [Abstract]
Derivative financial instruments	$ 22	$ 5
Total assets	14,376	27,947
Liabilities [Abstract]
Derivative financial instruments	274	230
Corporate Debt Securities and Other [Member]
Assets [Abstract]
Investments and cash and cash equivalents	2,514	22,242
Commercial Paper Debt Securities [Member]
Assets [Abstract]
Investments and cash and cash equivalents	11,840	0
Money Market Funds [Member]
Assets [Abstract]
Investments and cash and cash equivalents	0	5,700
Fair Value Measurements Using Input Types Level 1 [Member]
Assets [Abstract]
Derivative financial instruments	0	0
Total assets	0	10,599
Liabilities [Abstract]
Derivative financial instruments	0	0
Fair Value Measurements Using Input Types Level 1 [Member] \| Corporate Debt Securities and Other [Member]
Assets [Abstract]
Investments and cash and cash equivalents	0	4,899
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	0	5,700
Fair Value Measurements Using Input Types Level 2 [Member]
Assets [Abstract]
Derivative financial instruments	22	5
Total assets	14,376	17,348
Liabilities [Abstract]
Derivative financial instruments	274	230
Fair Value Measurements Using Input Types Level 2 [Member] \| Corporate Debt Securities and Other [Member]
Assets [Abstract]
Investments and cash and cash equivalents	2,514	17,343
Fair Value Measurements Using Input Types Level 2 [Member] \| Commercial Paper Debt Securities [Member]
Assets [Abstract]
Investments and cash and cash equivalents	11,840	0
Fair Value Measurements Using Input Types Level 2 [Member] \| Money Market Funds [Member]
Assets [Abstract]
Investments and cash and cash equivalents	$ 0	$ 0

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Fair value portion of investment securities, including, but not limited to, marketable securities, derivative financial instruments, and investments accounted for under the equity method.

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