LEASES, OTHER COMMITMENTS AND CERTAIN CONTINGENCIES Narrative (Details) - USD ($) $ in Millions	12 Months Ended
	May 31, 2021	May 31, 2020
Leases Other Commitments And Certain Contingencies Disclosure [Line Items]
Operating lease expenses	$ 654	$ 599
Sublease income	$ 13	$ 16
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List]	Other non-current assets
Right of use assets operating leases	$ 2,600
Operating Lease, Liability, Current, Statement of Financial Position [Extensible List]	Other current liabilities
Operating lease liabilities, current	$ 664
Operating Lease, Liability, Noncurrent, Statement of Financial Position [Extensible List]	Other non-current liabilities
Operating lease liabilities, non-current	$ 2,100
Right of use asset in exchange for operating lease obligation	1,700
Cash paid for operating lease liabilities	$ 696
Operating leases weighted average remaining lease term	7 years
Operating lease obligations, weighted average discount rate	2.80%
Additional operating lease commitments	$ 653
Minimum [Member]
Leases Other Commitments And Certain Contingencies Disclosure [Line Items]
Operating leases remaining terms	1 year
Operating leases not yet commenced, terms	1 year
Maximum [Member]
Leases Other Commitments And Certain Contingencies Disclosure [Line Items]
Operating leases remaining terms	11 years
Operating leases not yet commenced, terms	11 years