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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, 2020
May 31, 2019
U.S. Plans [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets $ 26,978 $ 23,320
PBO (30,199) (26,554)
Net funded status (3,221) (3,234)
ABO [1] (29,272) (25,915)
Fair value of plan assets 26,978 23,320
PBO (30,199) (26,554)
Net funded status (3,221) (3,234)
International Pension Plans [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 205 1,125
PBO (876) (1,929)
Net funded status (671) (804)
ABO [1] (637) (1,709)
Fair value of plan assets 175 1,120
PBO (840) (1,925)
Net funded status $ (665) $ (805)
[1] ABO not used in determination of funded status.