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Retirement Plans - Schedule of Retirement Plan Costs (Details) - USD ($)
$ in Millions
3 Months Ended
Aug. 31, 2023
Aug. 31, 2022
Pension and Other Postretirement Benefits Cost (Reversal of Cost) [Abstract]    
Defined benefit pension plans, net $ 91 $ 59
Defined contribution plans 240 244
Postretirement healthcare plans 23 23
Retirement plans costs $ 354 $ 326