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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, 2022
May 31, 2021
U.S. Plans [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets $ 25,970 $ 29,785
PBO (28,702) (31,423)
Net funded status (2,732) (1,638)
ABO (27,916) [1] (29,083)
Fair value of plan assets 25,970 28,383
PBO (28,702) (29,888)
Net funded status (2,732) (1,505)
International Pension Plans [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 199 241
PBO (758) (950)
Net funded status (559) (709)
ABO (604) [1] (722)
Fair value of plan assets 196 206
PBO (754) (908)
Net funded status $ (558) $ (702)
[1] ABO not used in determination of funded status.