Retirement Plans - Schedule of Components of Pension Plans (Details) - Pension Plans [Member] - USD ($) $ in Millions	May 31, 2022	May 31, 2021	May 31, 2020
Defined Benefit Plan Disclosure [Line Items]
Projected Benefit Obligation ("PBO")	$ 29,798	$ 34,034
Fair Value of Plan Assets	26,633	31,918
Funded Status	(3,165)	(2,116)
Qualified [Member]
Defined Benefit Plan Disclosure [Line Items]
Projected Benefit Obligation ("PBO")	28,524	31,225
Fair Value of Plan Assets	25,970	29,785
Funded Status	(2,554)	(1,440)
Nonqualified [Member]
Defined Benefit Plan Disclosure [Line Items]
Projected Benefit Obligation ("PBO")	178	198
Funded Status	(178)	(198)
International Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Projected Benefit Obligation ("PBO")	1,096	2,611	$ 2,242
Fair Value of Plan Assets	663	2,133	$ 1,713
Funded Status	$ (433)	$ (478)