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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, 2024
May 31, 2023
U.S. Plans [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets $ 25,797 $ 24,826
PBO (26,284) (26,426)
Net funded status (487) (1,600)
ABO [1] (124) (25,825)
Fair value of plan assets   24,826
PBO (132) (26,426)
Net funded status (132) (1,600)
International Pension Plans [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 239 223
PBO (728) (722)
Net funded status (489) (499)
ABO [1] (575) (562)
Fair value of plan assets 216 201
PBO (703) (700)
Net funded status $ (487) $ (499)
[1] ABO not used in determination of funded status.