FAIR VALUE MEASUREMENTS (Tables)

3 Months Ended

Aug. 31, 2015

Fair Value Measurements [Abstract]

Assets and Liabilities Measured at Fair Value on a Recurring Basis

		August 31, 2015						May 31, 2015
	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	$		615	$	—	$	615	$	668	$	—	$	668
Commercial paper debt securities			—		10,170		10,170		—		9,203		9,203
Corporate debt securities and other			153		31,196		31,349		190		28,654		28,844
Derivative financial instruments			—		75		75		—		74		74
Total assets	$		768	$	41,441	$	42,409	$	858	$	37,931	$	38,789
Liabilities:
Derivative financial instruments	$		—	$	222	$	222	$	—	$	244	$	244