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Stock Based Compensation (Details 4) (USD $)
In Millions, except Share data, unless otherwise specified
12 Months Ended
May 31, 2014
May 31, 2013
May 31, 2012
Ratio Of Outstanding And Available To Grant Shares To Total Outstanding Common And Equity Compensation Shares And Equity Compensation Shares Available For Grant [Abstract]      
Ratio Of Outstanding And Available To Grant Shares To Total Outstanding Common And Equity Compensation Shares And Equity Compensation Shares Available For Grant 8.00%fdx_RatioOfOutstandingAndAvailableToGrantSharesToTotalOutstandingCommonAndEquityCompensationSharesAndEquityCompensationSharesAvailableForGrant    
Share Based Compensation Arrangement By Share Based Award Options Vesting During Years [Abstract]      
Vested during the year 2,408,179fdx_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedInPeriodWeightedAverageGrantDateNumberOfShares 2,824,757fdx_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedInPeriodWeightedAverageGrantDateNumberOfShares 2,807,809fdx_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedInPeriodWeightedAverageGrantDateNumberOfShares
Fair Value $ 65fdx_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedInPeriodWeightedAverageGrantDateFairValue $ 81fdx_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedInPeriodWeightedAverageGrantDateFairValue $ 70fdx_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedInPeriodWeightedAverageGrantDateFairValue
Unrecognized Compensation Cost Related To Unvested Share Based Compensation Arrangements [Abstract]      
Total unrecognized compensation cost, net of estimated forfeitures $ 159us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized    
Stock option remaining weighted average vesting period 2 years