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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]        
Pension plans sponsored by FedEx $ 16 $ 19 $ 47 $ 58
Defined benefit pension plans 11 11 34 32
Defined contribution plans 64 62 187 183
Postretirement healthcare plans 16 16 47 47
Retirement plans costs $ 107 $ 108 $ 315 $ 320