FAIR VALUE MEASUREMENTS (Tables)

12 Months Ended

May 31, 2017

Fair Value Disclosures [Abstract]

Assets and Liabilities Measured at Fair Value on a Recurring Basis

	May 31, 2017						May 31, 2016
	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	$	580	$	41,038	$	41,618	$	393	$	35,095	$	35,488
Commercial paper debt securities		—		5,053		5,053		—		2,155		2,155
Money market funds		3,302		—		3,302		3,750		—		3,750
Derivative financial instruments		—		40		40		—		122		122
Total assets	$	3,882	$	46,131	$	50,013	$	4,143	$	37,372	$	41,515
Liabilities:
Derivative financial instruments	$	—	$	191	$	191	$	—	$	218	$	218