FAIR VALUE MEASUREMENTS (Tables)

12 Months Ended

May 31, 2016

Fair Value Measurements [Abstract]

Assets and Liabilities Measured at Fair Value on a Recurring Basis

	May 31, 2016						May 31, 2015
	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:
Money market funds	$	3,750	$	—	$	3,750	$	—	$	—	$	—
U.S. Treasury securities		214		—		214		668		—		668
Commercial paper debt securities		—		2,155		2,155		—		9,203		9,203
Corporate debt securities and other		179		35,095		35,274		190		28,654		28,844
Derivative financial instruments		—		122		122		—		74		74
Total assets	$	4,143	$	37,372	$	41,515	$	858	$	37,931	$	38,789
Liabilities:
Derivative financial instruments	$	—	$	218	$	218	$	—	$	244	$	244