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Retirement Plans - Schedule of Retirement Plan Costs (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Feb. 28, 2022
Feb. 28, 2021
Feb. 28, 2022
Feb. 28, 2021
Pension And Other Postretirement Benefit Expense [Abstract]        
Defined benefit pension plans, net $ 2 $ 20 $ (3) $ 72
Defined contribution plans 226 182 577 493
Postretirement healthcare plans 22 21 67 62
Retirement plans MTM net loss     260 52
Retirement plans costs $ 250 $ 223 $ 901 $ 679