FAIR VALUE MEASUREMENTS (Tables)

3 Months Ended

Aug. 31, 2018

Fair Value Disclosures [Abstract]

Assets and Liabilities Measured at Fair Value on a Recurring Basis

	August 31, 2018						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	$	148	$	41,419	$	41,567	$	223	$	44,079	$	44,302
Commercial paper debt securities		—		1,538		1,538		—		1,647		1,647
Money market funds		3,400		—		3,400		6,500		—		6,500
Derivative financial instruments		—		16		16		—		29		29
Total assets	$	3,548	$	42,973	$	46,521	$	6,723	$	45,755	$	52,478
Liabilities:
Derivative financial instruments	$	—	$	170	$	170	$	—	$	158	$	158