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Retirement Plans - Schedule of Fair Value of Plan Assets for Pension Plans with a PBO or ABO in Excess of Plan Assets (Details) - Pension Plans [Member] - USD ($)
$ in Millions
May 31, 2023
May 31, 2022
U.S. Plans [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets $ 24,826 $ 25,970
PBO (26,426) (28,702)
Net funded status (1,600) (2,732)
ABO [1] (25,825) (27,916)
Fair value of plan assets 24,826 25,970
PBO (26,426) (28,702)
Net funded status (1,600) (2,732)
International Pension Plans [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 223 199
PBO (722) (758)
Net funded status (499) (559)
ABO [1] (562) (604)
Fair value of plan assets 201 196
PBO (700) (754)
Net funded status $ (499) $ (558)
[1] ABO not used in determination of funded status.