FAIR VALUE MEASUREMENTS (Tables)

6 Months Ended

Nov. 30, 2019

Fair Value Disclosures [Abstract]

Assets and Liabilities Measured at Fair Value on a Recurring Basis

	November 30, 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	$	50	$	2,910	$	2,960	$	4,899	$	17,343	$	22,242
Commercial paper debt securities		—		13,787		13,787		—		—		—
Money market funds		—		—	—			5,700		—		5,700
Derivative financial instruments		—		12		12		—		5		5
Total assets	$	50	$	16,709	$	16,759	$	10,599	$	17,348	$	27,947
Liabilities:
Derivative financial instruments	$	—	$	269	$	269	$	—	$	230	$	230