FAIR VALUE MEASUREMENTS (Tables)

6 Months Ended

Nov. 30, 2014

Fair Value Measurements [Abstract]

Assets and Liabilities Measured at Fair Value on a Recurring Basis

	November 30, 2014						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	$	726	$	—	$	726	$	—	$	—	$	—
Commercial paper debt securities		—		9,775		9,775		—		7,969		7,969
Corporate debt securities and other		168		21,911		22,079		119		16,538		16,657
Derivative financial instruments		—		45		45		—		97		97
Total assets	$	894	$	31,731	$	32,625	$	119	$	24,604	$	24,723
Liabilities:
Derivative financial instruments	$	—	$	39	$	39	$	—	$	—	$	—