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Retirement Plans - Schedule of Retirement Plan Costs (Details) - USD ($)
$ in Millions
12 Months Ended
May 31, 2022
May 31, 2021
May 31, 2020
Pension and Other Postretirement Benefits Cost (Reversal of Cost) [Abstract]      
Defined benefit pension plans $ (2) $ 88 $ 148
Defined contribution plans 824 685 574
Postretirement healthcare plans 89 83 86
Retirement plans MTM loss (gain) 1,578 (1,176) 794
Retirement plans costs $ 2,489 $ (320) $ 1,602