FAIR VALUE MEASUREMENTS (Details) - USD ($) $ in Millions	Nov. 30, 2019	May 31, 2019
Assets [Abstract]
Derivative financial instruments	$ 12	$ 5
Total assets	16,759	27,947
Liabilities [Abstract]
Derivative financial instruments	269	230
Commercial Paper Debt Securities [Member]
Assets [Abstract]
Investments and cash and cash equivalents	13,787	0
Money Market Funds [Member]
Assets [Abstract]
Investments and cash and cash equivalents	0	5,700
Corporate Debt Securities and Other [Member]
Assets [Abstract]
Investments and cash and cash equivalents	2,960	22,242
Fair Value Measurements Using Input Types Level 1 [Member]
Assets [Abstract]
Derivative financial instruments	0	0
Total assets	50	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	0	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	50	4,899
Fair Value Measurements Using Input Types Level 2 [Member]
Assets [Abstract]
Derivative financial instruments	12	5
Total assets	16,709	17,348
Liabilities [Abstract]
Derivative financial instruments	269	230
Fair Value Measurements Using Input Types Level 2 [Member] \| Commercial Paper Debt Securities [Member]
Assets [Abstract]
Investments and cash and cash equivalents	13,787	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	$ 2,910	$ 17,343

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