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Income Taxes (Details 10) - USD ($) $ in Millions | 12 Months Ended
--- | ---
May 31, 2016 | May 31, 2015
Permanently Reinvested Earnings Of Foreign Subsidiaries [Abstract] |  |
Permanently Reinvested Earnings of Foreign Subsidiaries | $ 1,600 | $ 1,900
Permanent Reinvestment Strategy Benefit To Effective Tax Rate | $ 48 |
Percent Income Earned in US Companies | 80.00% |
Cash in Offshore Jurisdictions Associated With Permanent Reinvestment Strategy | $ 522 | $ 478

X
- Definition Represents the amount of cash in offshore jurisdictions associated with the entity's permanent reinvestment strategy. + References No definition available. + Details
Name: | fdx_CashInOffshoreJurisdictions
Namespace Prefix: | fdx_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- 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
Name: | fdx_PercentIncomeEarnedInUsCompanies
Namespace Prefix: | fdx_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the 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
Name: | fdx_PermanentReinvestmentStrategyBenefitToEffectiveTaxRate
Namespace Prefix: | fdx_
Data Type: | xbrli:monetaryItemType
Balance Type: | na
Period Type: | duration

X
- References No definition available. + Details
Name: | fdx_PermanentlyReinvestedEarningsOfForeignSubsidiariesAbstract
Namespace Prefix: | fdx_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- 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
Name: | fdx_UnremittedEarningsOfForeignSubsidiaries
Namespace Prefix: | fdx_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration