XML 112 R82.htm IDEA: XBRL DOCUMENT v3.20.2
Retirement Plans - Schedule of Retirement Plan Costs (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
May 31, 2020
May 31, 2019
May 31, 2020
May 31, 2019
May 31, 2018
Pension And Other Postretirement Benefit Expense [Abstract]          
Defined benefit pension plans     $ 148 $ 111 $ 150
Defined contribution plans     574 561 527
Postretirement healthcare plans     85 75 74
Retirement plans MTM loss (gain) $ 794 $ 3,900 794 3,882 (10)
Retirement plans costs     $ 1,601 $ 4,629 $ 741