FAIR VALUE MEASUREMENTS (Details) - USD ($) $ in Millions	May 31, 2020	May 31, 2019
Assets [Abstract]
Derivative financial instruments	$ 29	$ 5
Total assets	30,881	27,947
Liabilities [Abstract]
Derivative financial instruments	268	230
Commercial Paper Debt Securities [Member]
Assets [Abstract]
Investments and cash and cash equivalents	5,640	0
Money Market Funds [Member]
Assets [Abstract]
Investments and cash and cash equivalents	18,587	5,700
Corporate Debt Securities and Other [Member]
Assets [Abstract]
Investments and cash and cash equivalents	6,625	22,242
Fair Value Measurements Using Input Types Level 1 [Member]
Assets [Abstract]
Derivative financial instruments	0	0
Total assets	22,623	10,599
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	18,587	5,700
Fair Value Measurements Using Input Types Level 1 [Member] \| Corporate Debt Securities and Other [Member]
Assets [Abstract]
Investments and cash and cash equivalents	4,036	4,899
Fair Value Measurements Using Input Types Level 2 [Member]
Assets [Abstract]
Derivative financial instruments	29	5
Total assets	8,258	17,348
Liabilities [Abstract]
Derivative financial instruments	268	230
Fair Value Measurements Using Input Types Level 2 [Member] \| Commercial Paper Debt Securities [Member]
Assets [Abstract]
Investments and cash and cash equivalents	5,640	0
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	$ 2,589	$ 17,343

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