Retirement Plans - Schedule of Components of Pension Plans (Details) - Pension Plans [Member] - USD ($) $ in Millions	May 31, 2024	May 31, 2023	May 31, 2022
Defined Benefit Plan Disclosure [Line Items]
Projected Benefit Obligation ("PBO")	$ 27,302	$ 27,416
Fair Value of Plan Assets	26,399	25,405
Funded Status	(903)	(2,011)
Qualified [Member]
Defined Benefit Plan Disclosure [Line Items]
Projected Benefit Obligation ("PBO")	26,152	26,269
Fair Value of Plan Assets	25,797	24,826
Funded Status	(355)	(1,443)
Nonqualified [Member]
Defined Benefit Plan Disclosure [Line Items]
Projected Benefit Obligation ("PBO")	132	157
Funded Status	(132)	(157)
International Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Projected Benefit Obligation ("PBO")	1,018	990	$ 1,096
Fair Value of Plan Assets	602	579	$ 663
Funded Status	$ (416)	$ (411)