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Retirement Plans - Schedule of Retirement Plan Costs (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Feb. 28, 2017
Feb. 29, 2016
Feb. 28, 2017
Feb. 29, 2016
Pension And Other Postretirement Benefit Expense [Abstract]        
Defined benefit pension plans $ 57 $ 53 $ 173 $ 160
Defined contribution plans 117 104 348 304
Postretirement healthcare plans 19 20 57 61
Retirement plans costs $ 193 $ 177 $ 578 $ 525