LEASES - Supplemental Balance Sheet Information Related to Leases (Details) - USD ($) $ in Millions	Aug. 31, 2025	May 31, 2025
Operating leases:
Operating lease ROU assets	$ 15,979	$ 13,145
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration]	Other Assets, Noncurrent	Other Assets, Noncurrent
Operating lease liabilities:
Operating lease liabilities, current	$ 2,196	$ 1,914
Operating Lease, Liability, Current, Statement of Financial Position [Extensible Enumeration]	Other Liabilities, Current	Other Liabilities, Current
Operating lease liabilities, non-current	$ 14,094	$ 11,536
Operating Lease, Liability, Noncurrent, Statement of Financial Position [Extensible Enumeration]	Operating lease liabilities, non-current	Operating lease liabilities, non-current
Total operating lease liabilities	$ 16,290	$ 13,450
Finance leases:
Finance lease ROU assets	3,937	2,874
Finance leases:
Finance lease liabilities, current	337	257
Finance lease liabilities, non-current	3,680	2,677
Total finance lease liabilities	$ 4,017	$ 2,934