FAIR VALUE MEASUREMENTS (Tables)

3 Months Ended

Aug. 31, 2014

Fair Value Measurements [Abstract]

Assets and Liabilities Measured at Fair Value on a Recurring Basis

		August 31, 2014						May 31, 2014
	Fair Value Measurements							Fair Value Measurements
	Using Input Types							Using Input Types
(in millions)	Level 1			Level 2		Total		Level 1		Level 2		Total
Assets:
U.S. Treasury securities	$		476	$	—	$	476	$	—	$	—	$	—
Commercial paper debt securities			—		12,164		12,164		—		7,969		7,969
Corporate debt securities and other			158		20,032		20,190		119		16,538		16,657
Derivative financial instruments			—		67		67		—		97		97
Total assets	$		634	$	32,263	$	32,897	$	119	$	24,604	$	24,723
Liabilities:
Derivative financial instruments	$		—	$	3	$	3	$	—	$	—	$	—