FAIR VALUE MEASUREMENTS (Tables)

3 Months Ended

Aug. 31, 2019

Fair Value Disclosures [Abstract]

Assets and Liabilities Measured at Fair Value on a Recurring Basis

	August 31, 2019						May 31, 2019
	Fair Value Measurements Using Input Types						Fair Value Measurements Using Input Types
(in millions)	Level 1		Level 2		Total		Level 1		Level 2		Total
Assets:
Corporate debt securities and other	$	6,081	$	6,995	$	13,076	$	4,899	$	17,343	$	22,242
Commercial paper debt securities		—		11,406		11,406		—		—		—
Money market funds		1,350		—		1,350		5,700		—		5,700
Derivative financial instruments		—		17		17		—		5		5
Total assets	$	7,431	$	18,418	$	25,849	$	10,599	$	17,348	$	27,947
Liabilities:
Derivative financial instruments	$	—	$	249	$	249	$	—	$	230	$	230