FAIR VALUE MEASUREMENTS (Details) - USD ($) $ in Millions	Aug. 31, 2020	May 31, 2020
Assets [Abstract]
Derivative financial instruments	$ 79	$ 29
Total assets	28,347	30,881
Liabilities [Abstract]
Derivative financial instruments	143	268
Commercial Paper Debt Securities [Member]
Assets [Abstract]
Investments and cash and cash equivalents	9,029	5,640
Money Market Funds [Member]
Assets [Abstract]
Investments and cash and cash equivalents	8,378	18,587
Corporate Debt Securities and Other [Member]
Assets [Abstract]
Investments and cash and cash equivalents	10,861	6,625
Fair Value Measurements Using Input Types Level 1 [Member]
Assets [Abstract]
Derivative financial instruments	0	0
Total assets	12,039	22,623
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	8,378	18,587
Fair Value Measurements Using Input Types Level 1 [Member] \| Corporate Debt Securities and Other [Member]
Assets [Abstract]
Investments and cash and cash equivalents	3,661	4,036
Fair Value Measurements Using Input Types Level 2 [Member]
Assets [Abstract]
Derivative financial instruments	79	29
Total assets	16,308	8,258
Liabilities [Abstract]
Derivative financial instruments	143	268
Fair Value Measurements Using Input Types Level 2 [Member] \| Commercial Paper Debt Securities [Member]
Assets [Abstract]
Investments and cash and cash equivalents	9,029	5,640
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	$ 7,200	$ 2,589

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