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Business Combinations (Details) (USD $)
In Millions, unless otherwise specified
May 31, 2012
May 31, 2013
May 31, 2014
Mexico acquisition [Member]      
Business Acquisition Cost Of Acquired Entity [Abstract]      
Acquisition price $ 128us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet
/ fdx_ScheduleOfAcquisitionsAxis
= fdx_MexicoAcquisitionMember
   
Poland acquisition [Member]      
Business Acquisition Cost Of Acquired Entity [Abstract]      
Acquisition price   54us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet
/ fdx_ScheduleOfAcquisitionsAxis
= fdx_PolandAcquisitionMember
 
Brazil acquisition [Member]      
Business Acquisition Cost Of Acquired Entity [Abstract]      
Acquisition price   398us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet
/ fdx_ScheduleOfAcquisitionsAxis
= fdx_BrazilAcquisitionMember
 
France acquisition [Member]      
Business Acquisition Cost Of Acquired Entity [Abstract]      
Acquisition price   55us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet
/ fdx_ScheduleOfAcquisitionsAxis
= fdx_FranceAcquisitionMember
 
Southern Africa acquisition [Member]      
Business Acquisition Cost Of Acquired Entity [Abstract]      
Acquisition price     $ 36us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet
/ fdx_ScheduleOfAcquisitionsAxis
= fdx_SouthernAfricaAcquisitionMember