LEASES, OTHER COMMITMENTS AND CERTAIN CONTINGENCIES - Schedule of Maturities of Operating Lease Liabilities (Details) $ in Millions	May 31, 2020 USD ($)
Leases Other Commitments And Certain Contingencies Disclosure [Abstract]
Fiscal 2021	$ 616
Fiscal 2022	519
Fiscal 2023	350
Fiscal 2024	252
Fiscal 2025	192
Thereafter	386
Total operating lease payments	2,315
Less: imputed interest	(217)
Total operating lease liability	$ 2,098
Operating Lease, Liability, Current, Statement of Financial Position [Extensible List]	us-gaap:OtherLiabilitiesCurrent
Operating Lease, Liability, Noncurrent, Statement of Financial Position [Extensible List]	us-gaap:OtherLiabilitiesNoncurrent