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Retirement Plans (Details 3) (USD $)
In Millions, unless otherwise specified
 6 Months Ended
Nov. 30, 2014
Nov. 30, 2013
Pension Plans Contributions [Abstract]    
Required U.S. pension plan contributions $ 247fdx_RequiredRetirementPlanContributionsByEmployer $ 315fdx_RequiredRetirementPlanContributionsByEmployer
Voluntary U.S. pension plan contributions 83fdx_VoluntaryRetirementPlanContributionsByEmployer 15fdx_VoluntaryRetirementPlanContributionsByEmployer
U.S. domestic pension contributions 330us-gaap_DefinedBenefitPlanContributionsByEmployer 330us-gaap_DefinedBenefitPlanContributionsByEmployer
December 2014 U.S. Pension Plans contribution 165fdx_DefinedBenefitPlanDecemberEmployerContributionsInCurrentFiscalYear  
Subsequent voluntary contribution remainder 2015 $ 160fdx_Subsequentvoluntarycontributionremainder2015