COMMITMENTS AND CERTAIN CONTINGENCIES Narrative (Details) - USD ($) $ in Millions	12 Months Ended
	May 31, 2018	May 31, 2017	May 31, 2016
Lease Commitments [Abstract]
Facility obligations, net of estimated sub-lease income and other costs, in accrued restructuring	$ 61
Rent expense, net of sublease income	292	$ 273	$ 283
Sublease income	104	87	$ 45
Unconditional Obligations [Abstract]
Notes payable and other borrowings	$ 60,927	$ 58,145
Guarantees [Abstract]
Financial impact of guarantees	Such agreements have not had a material effect on our results of operations, financial position or cash flows.