Leases - Schedule of Supplemental Balance Sheet Information Related to Leases (Details) - USD ($) $ in Millions	May 31, 2022	May 31, 2021
Operating leases:
Operating lease right-of-use assets, net	$ 16,613	$ 15,383
Current portion of operating lease liabilities	2,443	2,208
Operating lease liabilities	14,487	13,375
Total operating lease liabilities	16,930	15,583
Finance leases:
Net property and equipment	$ 455	$ 504
Finance Lease, Right of Use Asset, Statement of Financial Position [Extensible List]	Net Book Value at May 31,	Net Book Value at May 31,
Current portion of long-term debt	$ 32	$ 96
Finance Lease, Liability, Current Statement of Financial Position [Extensible List]	LONG-TERM DEBT, LESS CURRENT PORTION	LONG-TERM DEBT, LESS CURRENT PORTION
Long-term debt, less current portion	$ 436	$ 429
Finance Lease, Liability, Noncurrent, Statement of Financial Position [Extensible List]	LONG-TERM DEBT, LESS CURRENT PORTION	LONG-TERM DEBT, LESS CURRENT PORTION
Total finance lease liabilities	$ 468	$ 525
Weighted-average remaining lease term
Operating leases	9 years 9 months 18 days	9 years 10 months 24 days
Finance leases	30 years 9 months 18 days	30 years 1 month 6 days
Weighted-average discount rate
Operating leases	2.85%	2.94%
Finance leases	3.45%	3.43%