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Income Taxes (Details 7) (USD $) In Millions, unless otherwise specified | 12 Months Ended
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May 31, 2014 | May 31, 2013
Income Tax Uncertainties [Abstract] |  |
Unrecognized Tax Benefits That Would Impact Effective Tax Rate | $ 33 us-gaap_UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate | $ 42 us-gaap_UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate
Unrecognized Tax Benefits Accrued Income Tax Penalties And Interest | 19 us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued | 29 us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued
Permanently Reinvested Earnings Of Foreign Subsidiaries [Abstract] |  |
Permanently Reinvested Earnings of Foreign Subsidiaries | 1,600 fdx_UnremittedEarningsOfForeignSubsidiaries | 1,300 fdx_UnremittedEarningsOfForeignSubsidiaries
Permanent Reinvestment Strategy Percent Benefit To Effective Tax Rate | 1.20%fdx_PermanentReinvestmentStrategyPercentBenefitToEffectiveTaxRate |
Percent Income Earned in US Companies | 90.00%fdx_PercentIncomeEarnedInUsCompanies |
Cash in Offshore Jurisdictions Associated With Permanent Reinvestment Strategy | 471 fdx_CashInOffshoreJurisdictions | 420 fdx_CashInOffshoreJurisdictions
Foreign Country [Member] |  |
Operating Loss Carryforwards [Line Items] |  |
Operating Loss Carryforwards | 1,000 us-gaap_OperatingLossCarryforwards / us-gaap_IncomeTaxAuthorityAxis = us-gaap_ForeignCountryMember |
State And Local Jurisdiction [Member] |  |
Operating Loss Carryforwards [Line Items] |  |
Operating Loss Carryforwards | $ 515 us-gaap_OperatingLossCarryforwards / us-gaap_IncomeTaxAuthorityAxis = us-gaap_StateAndLocalJurisdictionMember |

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- Definition Represents the amount of cash in offshore jurisdictions associated with the entity's permanent reinvestment strategy. + References No definition available. + Details
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- Definition Represents the percent of our total enterprise-wide income was earned in U.S. companies of FedEx that are taxable in the United States. + References No definition available. + Details
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- Definition Represents the percent benefit to the effective tax rate for the entity's permanent reinvestment strategy with respect to unremitted earnings of foreign subsidiaries. + References No definition available. + Details
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- Definition The amount of unremitted earnings of foreign subsidiaries for which deferred taxes for U.S. federal income tax purposes have not been recognized as the unremitted earnings have been determined to be permanently reinvested in the foreign subsidiaries. + References No definition available. + Details
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- Definition Amount of operating loss carryforward, before tax effects, available to reduce future taxable income under enacted tax laws. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32559-109319 + Details
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- Definition Amount accrued for interest on an underpayment of income taxes and penalties related to a tax position claimed or expected to be claimed in the tax return. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32718-109319 + Details
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- Definition The total amount of unrecognized tax benefits that, if recognized, would affect the effective tax rate. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6907707&loc=SL6600010-109319 + Details
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