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Retirement Plans - Schedule of Retirement Plan Costs (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Nov. 30, 2021
Nov. 30, 2020
Nov. 30, 2021
Nov. 30, 2020
Pension And Other Postretirement Benefit Expense [Abstract]        
Defined benefit pension plans, net $ (2) $ 27 $ (5) $ 52
Defined contribution plans 171 153 351 311
Postretirement healthcare plans 23 20 45 41
Retirement plans MTM net loss 260 52 260 52
Retirement plans costs $ 452 $ 252 $ 651 $ 456