COMMITMENTS AND CERTAIN CONTINGENCIES Narrative (Details) - USD ($) $ in Millions	12 Months Ended
	May 31, 2019	May 31, 2018	May 31, 2017
Lease Commitments [Abstract]
Facility obligations, net of estimated sub-lease income and other costs, in accrued restructuring	$ 58
Rent expense, net of sublease income	665	$ 618	$ 501
Sublease income	16	20	$ 24
Unconditional Obligations [Abstract]
Notes payable and other borrowings	$ 56,342	$ 60,927
Guarantees [Abstract]
Financial impact of guarantees	Such agreements have not had a material effect on our results of operations, financial position or cash flows.