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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, 2021
May 31, 2020
U.S. Plans [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets $ 29,785 $ 26,978
PBO (31,423) (30,199)
Net funded status (1,638) (3,221)
ABO [1] (29,083) (29,272)
Fair value of plan assets 28,383 26,978
PBO (29,888) (30,199)
Net funded status (1,505) (3,221)
International Pension Plans [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 241 205
PBO (950) (876)
Net funded status (709) (671)
ABO [1] (722) (637)
Fair value of plan assets 206 175
PBO (908) (840)
Net funded status $ (702) $ (665)
[1] ABO not used in determination of funded status.