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Retirement Plans - Schedule of Retirement Plan Costs (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
May 31, 2019
May 31, 2018
May 31, 2019
May 31, 2018
May 31, 2017
Pension And Other Postretirement Benefit Expense [Abstract]          
Defined benefit pension plans     $ 111 $ 150 $ 234
Defined contribution plans     561 527 480
Postretirement healthcare plans     75 74 76
Retirement plans mark-to-market loss (gain) $ 3,900 $ (10) 3,882 (10) (24)
Retirement plans costs     $ 4,629 $ 741 $ 766