FAIR VALUE MEASUREMENTS (Tables)

12 Months Ended

May. 31, 2015

Fair Value Measurements [Abstract]

Assets and Liabilities Measured at Fair Value on a Recurring Basis

	May 31, 2015						May 31, 2014
	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:
U.S. Treasury securities	$	668	$	—	$	668	$	—	$	—	$	—
Commercial paper debt securities		—		9,203		9,203		—		7,969		7,969
Corporate debt securities and other		190		28,654		28,844		119		16,538		16,657
Derivative financial instruments		—		74		74		—		97		97
Total assets	$	858	$	37,931	$	38,789	$	119	$	24,604	$	24,723
Liabilities:
Derivative financial instruments	$	—	$	244	$	244	$	—	$	—	$	—