Retirement Plans - Schedule of Components of Pension Plans (Details) - Pension Plans [Member] - USD ($) $ in Millions	May 31, 2023	May 31, 2022	May 31, 2021
Defined Benefit Plan Disclosure [Line Items]
Projected Benefit Obligation ("PBO")	$ 27,416	$ 29,798
Fair Value of Plan Assets	25,405	26,633
Funded Status	(2,011)	(3,165)
Qualified [Member]
Defined Benefit Plan Disclosure [Line Items]
Projected Benefit Obligation ("PBO")	26,269	28,524
Fair Value of Plan Assets	24,826	25,970
Funded Status	(1,443)	(2,554)
Nonqualified [Member]
Defined Benefit Plan Disclosure [Line Items]
Projected Benefit Obligation ("PBO")	157	178
Funded Status	(157)	(178)
International Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Projected Benefit Obligation ("PBO")	990	1,096	$ 2,611
Fair Value of Plan Assets	579	663	$ 2,133
Funded Status	$ (411)	$ (433)