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Retirement Plans - Schedule of Retirement Plan Costs (Details) - USD ($)
$ in Millions
12 Months Ended
May 31, 2021
May 31, 2020
May 31, 2019
Pension And Other Postretirement Benefit Expense [Abstract]      
Defined benefit pension plans $ 88 $ 148 $ 112
Defined contribution plans 685 574 561
Postretirement healthcare plans 83 86 75
Retirement plans MTM (gain) loss (1,176) 794 3,882
Retirement plans costs $ (320) $ 1,602 $ 4,630