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Retirement Plans (Details 1) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Feb. 29, 2016
Feb. 28, 2015
Feb. 29, 2016
Feb. 28, 2015
Pension and Other Postretirement Benefit Expense [Abstract]        
Defined benefit pension plans $ 53 $ (10) $ 160 $ (27)
Defined contribution plans 104 96 304 284
Postretirement healthcare plans 20 21 61 61
Retirement plans costs $ 177 $ 107 $ 525 $ 318