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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) - USD ($)
$ in Millions
May 31, 2017
May 31, 2016
U.S. Pension Plans [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets $ 24,933 $ 23,017
PBO (27,870) (27,804)
Net funded status (2,937) (4,787)
ABO [1] (27,244) (27,236)
Fair value of plan assets 24,933 23,017
PBO (27,870) (27,804)
Net funded status (2,937) (4,787)
International Pension Plans [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 952 850
PBO (1,656) (1,447)
Net funded status (704) (597)
ABO [1] (1,433) (1,257)
Fair value of plan assets 928 848
PBO (1,626) (1,445)
Net funded status $ (698) $ (597)
[1] ABO not used in determination of funded status.