COMMITMENTS AND CERTAIN CONTINGENCIES Narrative (Details) - USD ($) $ in Millions	12 Months Ended
	May 31, 2017	May 31, 2016	May 31, 2015
Lease Commitments [Abstract]
Facility obligations, net of estimated sub-lease income and other costs, in accrued restructuring	$ 53
Rent expense, net of sublease income	273	$ 283	$ 290
Sublease income	87	45	$ 45
Unconditional Obligations [Abstract]
Notes payable and other borrowings	$ 58,145	$ 43,980
Guarantees [Abstract]
Financial impact of guarantees	Such agreements have not had a material effect on our results of operations, financial position or cash flows.