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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, 2019
May 31, 2018
U.S. Plans [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets $ 23,320 $ 22,057
PBO (26,554) (22,653)
Net funded status (3,234) (596)
ABO [1] (25,915) (1,134)
Fair value of plan assets 23,320 859
PBO (26,554) (1,214)
Net funded status (3,234) (355)
International Pension Plans [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 1,125 1,060
PBO (1,929) (1,791)
Net funded status (804) (731)
ABO [1] (1,709) (1,581)
Fair value of plan assets 1,120 1,060
PBO (1,925) (1,791)
Net funded status $ (805) $ (731)
[1] ABO not used in determination of funded status.