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Retirement Plans (Tables)
9 Months Ended
Feb. 29, 2016
Retirement Plan (Tables) [Abstract]  
Schedule of Retirement Plan Costs
Our retirement plans costs for the periods ended February 29, 2016 and February 28, 2015 were as follows (in millions):   
 
   Three Months Ended Nine Months Ended
   2016 2015 2016 2015
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
              
   $ 107 $ 108 $ 315 $ 320