FAIR VALUE MEASUREMENTS (Tables)

9 Months Ended

Feb. 28, 2019

Fair Value Disclosures [Abstract]

Assets and Liabilities Measured at Fair Value on a Recurring Basis

	February 28, 2019						May 31, 2018
	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	$	—	$	25,361	$	25,361	$	223	$	44,079	$	44,302
Commercial paper debt securities		—		348		348		—		1,647		1,647
Money market funds		6,050		—		6,050		6,500		—		6,500
Derivative financial instruments		—		—		—		—		29		29
Total assets	$	6,050	$	25,709	$	31,759	$	6,723	$	45,755	$	52,478
Liabilities:
Derivative financial instruments	$	—	$	206	$	206	$	—	$	158	$	158