Income Taxes - Schedule of Significant Components of Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Millions	May 31, 2024	May 31, 2023
Components of Deferred Tax Assets and Liabilities [Abstract]
Property, equipment, leases and intangibles	$ 4,597	$ 4,608
Employee benefits	744	876
Self-insurance accruals	1,183	1,085
Other	561	454
Net operating loss/credit carryforwards	1,306	1,149
Valuation allowances	(537)	(471)
Deferred Tax Assets, Net	7,854	7,701
Property, equipment, leases and intangibles	10,815	10,965
Employee benefits	68
Other	140	62
Deferred Tax Liabilities	$ 11,023	$ 11,027