FAIR VALUE MEASUREMENTS (Details) - USD ($) $ in Millions	Aug. 31, 2019	May 31, 2019
Assets [Abstract]
Derivative financial instruments	$ 17	$ 5
Total assets	25,849	27,947
Liabilities [Abstract]
Derivative financial instruments	249	230
Commercial Paper Debt Securities [Member]
Assets [Abstract]
Investments and cash and cash equivalents	11,406	0
Money Market Funds [Member]
Assets [Abstract]
Investments and cash and cash equivalents	1,350	5,700
Corporate Debt Securities and Other [Member]
Assets [Abstract]
Investments and cash and cash equivalents	13,076	22,242
Fair Value Measurements Using Input Types Level 1 [Member]
Assets [Abstract]
Derivative financial instruments	0	0
Total assets	7,431	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	1,350	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	6,081	4,899
Fair Value Measurements Using Input Types Level 2 [Member]
Assets [Abstract]
Derivative financial instruments	17	5
Total assets	18,418	17,348
Liabilities [Abstract]
Derivative financial instruments	249	230
Fair Value Measurements Using Input Types Level 2 [Member] \| Commercial Paper Debt Securities [Member]
Assets [Abstract]
Investments and cash and cash equivalents	11,406	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	$ 6,995	$ 17,343

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