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Description of Business and Summary of Significant Accounting Policies (Details) (USD $) In Millions, except Share data, unless otherwise specified | 3 Months Ended | 12 Months Ended
--- | --- | ---
May 31, 2014 | Feb. 28, 2014 | May 31, 2013 | Feb. 28, 2013 | Nov. 30, 2012 | May 31, 2014 | May 31, 2013 | May 31, 2012
Advertising [Abstract] |  |  |  |  |  |  |  |
Advertising and promotion expenses |  |  |  |  |  | $ 407 us-gaap_MarketingAndAdvertisingExpense | $ 424 us-gaap_MarketingAndAdvertisingExpense | $ 421 us-gaap_MarketingAndAdvertisingExpense
Business Realignment Costs [Abstract] |  |  |  |  |  |  |  |
Business Realignment Costs |  |  | 496 fdx_BusinessRealignmentCosts | 47 fdx_BusinessRealignmentCosts | 13 fdx_BusinessRealignmentCosts |  | 560 fdx_BusinessRealignmentCosts |
Business Realignment Costs, Net Of Tax |  |  |  |  |  |  | 353 fdx_BusinessRealignmentCostsNetOfTax |
Business Realignment Costs, Diluted EPS Impact |  |  |  |  |  |  | $ 1.11 fdx_BusinessRealignmentCostsDilutedEpsImpact |
Business Realignment Costs Paid |  |  |  |  |  | 300 fdx_BusinessRealignmentCostsPaid | 180 fdx_BusinessRealignmentCostsPaid |
Number of Employees Accepted Voluntary Buyout |  |  |  |  |  | 3,600 fdx_VoluntaryBuyoutEmployeesAccepted |  |
Percent Employees Departed May 31, 2013 |  |  |  |  |  |  | 40.00%fdx_PercentEmployeesDepartedPriorPeriod |
Percent Employees Departed Throughout 2014 |  |  |  |  |  | 35.00%fdx_PercentEmployeesToDepartThroughoutCurrentPeriod |  |
Percent Employees Departed on May 31, 2014 |  |  |  |  |  | 25.00%fdx_PercentEmployeesToDepartEndOfCurrentPeriod |  |
Capitalized Interest [Abstract] |  |  |  |  |  |  |  |
Interest Costs Capitalized |  |  |  |  |  | 29 us-gaap_InterestCostsCapitalized | 45 us-gaap_InterestCostsCapitalized | 85 us-gaap_InterestCostsCapitalized
Dividends Declared [Abstract] |  |  |  |  |  |  |  |
Dividends Payable, Date Declared |  |  |  |  |  | Jun. 09, 2014 |  |
Dividends Payable Amount Per Share | $ 0.2 us-gaap_DividendsPayableAmountPerShare |  |  |  |  | $ 0.2 us-gaap_DividendsPayableAmountPerShare |  |
Dividends Payable, Date Paid |  |  |  |  |  | Jul. 03, 2014 |  |
Dividends Payable, Date Of Record |  |  |  |  |  | Jun. 19, 2014 |  |
Quarterly Dividend Increase Per Common Share | $ 0.05 fdx_Quarterlydividendincreasepercommonshare |  |  |  |  | $ 0.05 fdx_Quarterlydividendincreasepercommonshare |  |
Impairment of Long Lived Assets [Abstract] |  |  |  |  |  |  |  |
Asset impairments Diluted EPS impact |  |  |  |  |  |  | $ 0.20 fdx_AssetImpairmentsDilutedEpsImpact | $ 0.26 fdx_AssetImpairmentsDilutedEpsImpact
Asset impairments, net of tax |  |  |  |  |  |  | 63 fdx_AssetImpairmentsNetOfTax | 84 fdx_AssetImpairmentsNetOfTax
Number of Impaired Airbus A310-200 Aircraft |  |  | 2 fdx_NumberOfImpairedAirbus310200Aircraft |  |  |  | 2 fdx_NumberOfImpairedAirbus310200Aircraft | 18 fdx_NumberOfImpairedAirbus310200Aircraft
Number of Impaired Boeing MD10-10 Aircraft |  |  | 5 fdx_NumberOfImpairedBoeingAircraft |  |  |  | 5 fdx_NumberOfImpairedBoeingAircraft | 6 fdx_NumberOfImpairedBoeingAircraft
Number of Impaired Airbus A310-200 Aircraft Engines |  |  | 4 fdx_NumberOfImpairedAirbus310200AircraftEngines |  |  |  | 4 fdx_NumberOfImpairedAirbus310200AircraftEngines | 26 fdx_NumberOfImpairedAirbus310200AircraftEngines
Number of Impaired Boeing MD10-10 Aircraft Engines |  |  | 15 fdx_NumberOfImpairedBoeingAircraftEngines |  |  |  | 15 fdx_NumberOfImpairedBoeingAircraftEngines | 17 fdx_NumberOfImpairedBoeingAircraftEngines
Number of Impaired Airbus A310-300 Aircraft |  |  | 3 fdx_NumberOfImpairedAirbus310300Aircraft |  |  |  | 3 fdx_NumberOfImpairedAirbus310300Aircraft |
Number of Impaired Airbus A310-300 Aircraft Engines |  |  | 2 fdx_NumberOfImpairedAirbus310300AircraftEngines |  |  |  | 2 fdx_NumberOfImpairedAirbus310300AircraftEngines |
Number of Idle Aircraft | 10 fdx_NumberOfIdleAircraft |  |  |  |  | 10 fdx_NumberOfIdleAircraft |  |
Aircraft Idle Term |  |  |  |  |  | 3 months |  |
Asset impairments |  |  |  |  |  |  | 100 us-gaap_ImpairmentOfLongLivedAssetsToBeDisposedOf | 134 us-gaap_ImpairmentOfLongLivedAssetsToBeDisposedOf
Number of Idle Aircraft Fully Depreciated | 1 fdx_NumberOfIdleAircraftFullyDepreciated |  |  |  |  | 1 fdx_NumberOfIdleAircraftFullyDepreciated |  |
Pension And Postretirement Healthcare Plans Equity Impact [Abstract] |  |  |  |  |  |  |  |
Benefit plans adjustments at year-end measurement date, net of tax |  |  |  |  |  | 11 fdx_OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentNetOfTaxYearEnd | (861)fdx_OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentNetOfTaxYearEnd |
Property And Equipment [Line Items] |  |  |  |  |  |  |  |
Net property and equipment | 19,550 us-gaap_PropertyPlantAndEquipmentNet |  | 18,484 us-gaap_PropertyPlantAndEquipmentNet |  |  | 19,550 us-gaap_PropertyPlantAndEquipmentNet | 18,484 us-gaap_PropertyPlantAndEquipmentNet |
Depreciation expense, excluding gains and losses on sales of property and equipment |  |  |  |  |  | 2,600 us-gaap_Depreciation | 2,300 us-gaap_Depreciation | 2,100 us-gaap_Depreciation
Depreciable Life Range For Majority Of Aircraft Costs |  |  |  |  |  | 15 to 30 |  |
Number of Aircraft With Shortened Depreciable Lives |  |  | 76 fdx_AircraftWithShortenedDepreciableLives |  |  |  | 76 fdx_AircraftWithShortenedDepreciableLives | 54 fdx_AircraftWithShortenedDepreciableLives
Incremental Depreciation Expense |  |  |  |  |  | 74 fdx_IncrementalDepreciation | 69 fdx_IncrementalDepreciation |
Treasury Shares [Abstract] |  |  |  |  |  |  |  |
Treasury Stock Acquired, Average Cost Per Share |  |  |  |  |  | $ 132 us-gaap_TreasuryStockAcquiredAverageCostPerShare |  |
Purchase of treasury stock |  |  |  |  |  | 4,857 us-gaap_PaymentsForRepurchaseOfCommonStock | 246 us-gaap_PaymentsForRepurchaseOfCommonStock | 197 us-gaap_PaymentsForRepurchaseOfCommonStock
Stock Repurchase Program, Number Of Shares Authorized To Be Repurchased | 32,000,000 us-gaap_StockRepurchaseProgramNumberOfSharesAuthorizedToBeRepurchased |  |  |  |  | 32,000,000 us-gaap_StockRepurchaseProgramNumberOfSharesAuthorizedToBeRepurchased |  |
Stock Repurchase Program, Remaining Number of Shares Authorized to be Repurchased | 5,300,000 us-gaap_StockRepurchaseProgramRemainingNumberOfSharesAuthorizedToBeRepurchased |  |  |  |  | 5,300,000 us-gaap_StockRepurchaseProgramRemainingNumberOfSharesAuthorizedToBeRepurchased |  |
Treasury Stock Shares Acquired |  |  |  |  |  | 36,800,000 us-gaap_TreasuryStockSharesAcquired | 2,700,000 us-gaap_TreasuryStockSharesAcquired | 2,800,000 us-gaap_TreasuryStockSharesAcquired
Stock Repurchase Program Remaining Number Of Shares Authorized To Be Repurchased Under Previous Program | 10,200,000 fdx_Stockrepurchaseprogramremainingnumberofsharesauthorizedtoberepurchasedunderpreviousprogram |  |  |  |  | 10,200,000 fdx_Stockrepurchaseprogramremainingnumberofsharesauthorizedtoberepurchasedunderpreviousprogram |  |
Accelerated share repurchase aggregate payment |  |  |  |  |  | 2,000 fdx_Acceleratedsharerepurchaseaggregatepayment |  |
Accelerated Share Repurchase Shares Delivered | 3,400,000 fdx_Acceleratedsharerepurchasesharesdelivered | 11,400,000 fdx_Acceleratedsharerepurchasesharesdelivered |  |  |  | 14,800,000 fdx_Acceleratedsharerepurchasesharesdelivered |  |
Wide Body Aircraft And Related Equipment [Member] |  |  |  |  |  |  |  |
Property And Equipment [Line Items] |  |  |  |  |  |  |  |
Depreciable lives range |  |  |  |  |  | 15 to 30 years |  |
Net property and equipment | 7,223 us-gaap_PropertyPlantAndEquipmentNet / us-gaap_PropertyPlantAndEquipmentByTypeAxis = fdx_WideBodyAircraftAndRelatedEquipmentMember |  | 7,191 us-gaap_PropertyPlantAndEquipmentNet / us-gaap_PropertyPlantAndEquipmentByTypeAxis = fdx_WideBodyAircraftAndRelatedEquipmentMember |  |  | 7,223 us-gaap_PropertyPlantAndEquipmentNet / us-gaap_PropertyPlantAndEquipmentByTypeAxis = fdx_WideBodyAircraftAndRelatedEquipmentMember | 7,191 us-gaap_PropertyPlantAndEquipmentNet / us-gaap_PropertyPlantAndEquipmentByTypeAxis = fdx_WideBodyAircraftAndRelatedEquipmentMember |
Narrow Body And Feeder Aircraft And Related Equipment [Member] |  |  |  |  |  |  |  |
Property And Equipment [Line Items] |  |  |  |  |  |  |  |
Depreciable lives range |  |  |  |  |  | 5 to 18 years |  |
Net property and equipment | 2,639 us-gaap_PropertyPlantAndEquipmentNet / us-gaap_PropertyPlantAndEquipmentByTypeAxis = fdx_NarrowBodyAndFeederAircraftAndRelatedEquipmentMember |  | 2,284 us-gaap_PropertyPlantAndEquipmentNet / us-gaap_PropertyPlantAndEquipmentByTypeAxis = fdx_NarrowBodyAndFeederAircraftAndRelatedEquipmentMember |  |  | 2,639 us-gaap_PropertyPlantAndEquipmentNet / us-gaap_PropertyPlantAndEquipmentByTypeAxis = fdx_NarrowBodyAndFeederAircraftAndRelatedEquipmentMember | 2,284 us-gaap_PropertyPlantAndEquipmentNet / us-gaap_PropertyPlantAndEquipmentByTypeAxis = fdx_NarrowBodyAndFeederAircraftAndRelatedEquipmentMember |
Package Handling And Ground Support Equipment [Member] |  |  |  |  |  |  |  |
Property And Equipment [Line Items] |  |  |  |  |  |  |  |
Depreciable lives range |  |  |  |  |  | 3 to 30 years |  |
Net property and equipment | 2,676 us-gaap_PropertyPlantAndEquipmentNet / us-gaap_PropertyPlantAndEquipmentByTypeAxis = fdx_PackageHandlingAndGroundSupportEquipmentMember |  | 2,311 us-gaap_PropertyPlantAndEquipmentNet / us-gaap_PropertyPlantAndEquipmentByTypeAxis = fdx_PackageHandlingAndGroundSupportEquipmentMember |  |  | 2,676 us-gaap_PropertyPlantAndEquipmentNet / us-gaap_PropertyPlantAndEquipmentByTypeAxis = fdx_PackageHandlingAndGroundSupportEquipmentMember | 2,311 us-gaap_PropertyPlantAndEquipmentNet / us-gaap_PropertyPlantAndEquipmentByTypeAxis = fdx_PackageHandlingAndGroundSupportEquipmentMember |
Vehicles [Member] |  |  |  |  |  |  |  |
Property And Equipment [Line Items] |  |  |  |  |  |  |  |
Depreciable lives range |  |  |  |  |  | 3 to 15 years |  |
Net property and equipment | 1,963 us-gaap_PropertyPlantAndEquipmentNet / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_VehiclesMember |  | 1,748 us-gaap_PropertyPlantAndEquipmentNet / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_VehiclesMember |  |  | 1,963 us-gaap_PropertyPlantAndEquipmentNet / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_VehiclesMember | 1,748 us-gaap_PropertyPlantAndEquipmentNet / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_VehiclesMember |
Computer And Electronic Equipment [Member] |  |  |  |  |  |  |  |
Property And Equipment [Line Items] |  |  |  |  |  |  |  |
Depreciable lives range |  |  |  |  |  | 2 to 10 years |  |
Net property and equipment | 940 us-gaap_PropertyPlantAndEquipmentNet / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_ComputerEquipmentMember |  | 993 us-gaap_PropertyPlantAndEquipmentNet / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_ComputerEquipmentMember |  |  | 940 us-gaap_PropertyPlantAndEquipmentNet / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_ComputerEquipmentMember | 993 us-gaap_PropertyPlantAndEquipmentNet / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_ComputerEquipmentMember |
Facilities And Other Property [Member] |  |  |  |  |  |  |  |
Property And Equipment [Line Items] |  |  |  |  |  |  |  |
Depreciable lives range |  |  |  |  |  | 2 to 40 years |  |
Net property and equipment | $ 4,109 us-gaap_PropertyPlantAndEquipmentNet / us-gaap_PropertyPlantAndEquipmentByTypeAxis = fdx_FacilitiesAndOtherPropertyMember |  | $ 3,957 us-gaap_PropertyPlantAndEquipmentNet / us-gaap_PropertyPlantAndEquipmentByTypeAxis = fdx_FacilitiesAndOtherPropertyMember |  |  | $ 4,109 us-gaap_PropertyPlantAndEquipmentNet / us-gaap_PropertyPlantAndEquipmentByTypeAxis = fdx_FacilitiesAndOtherPropertyMember | $ 3,957 us-gaap_PropertyPlantAndEquipmentNet / us-gaap_PropertyPlantAndEquipmentByTypeAxis = fdx_FacilitiesAndOtherPropertyMember |

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- Definition Describes the periods of time over which an entity anticipates to receive utility from its property, plant and equipment (that is, the periods of time over which an entity allocates the initial cost of its property, plant and equipment). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6367646&loc=d3e18780-107790 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -URI http://asc.fasb.org/subtopic&trid=2155824 + Details
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