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Retirement Plans (Details 1) - USD ($)
$ in Millions
3 Months Ended
Aug. 31, 2015
Aug. 31, 2014
Pension and Other Postretirement Benefit Expense [Abstract]    
Pension plans sponsored by FedEx $ 16 $ 19
Defined pension plans 11 11
Defined contribution plans 64 61
Postretirement healthcare plans 16 16
Retirement plans costs $ 107 $ 107