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Retirement Plans (Details 3) (USD $) In Millions, unless otherwise specified | 6 Months Ended
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Nov. 30, 2014 | Nov. 30, 2013
Pension Plans Contributions [Abstract] |  |
Required U.S. pension plan contributions | $ 247 fdx_RequiredRetirementPlanContributionsByEmployer | $ 315 fdx_RequiredRetirementPlanContributionsByEmployer
Voluntary U.S. pension plan contributions | 83 fdx_VoluntaryRetirementPlanContributionsByEmployer | 15 fdx_VoluntaryRetirementPlanContributionsByEmployer
U.S. domestic pension contributions | 330 us-gaap_DefinedBenefitPlanContributionsByEmployer | 330 us-gaap_DefinedBenefitPlanContributionsByEmployer
December 2014 U.S. Pension Plans contribution | 165 fdx_DefinedBenefitPlanDecemberEmployerContributionsInCurrentFiscalYear |
Subsequent voluntary contribution remainder 2015 | $ 160 fdx_Subsequentvoluntarycontributionremainder2015 |

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- Definition The employer's contributions paid to the plan in December 2014. Contributions may be presented in the aggregate combining (1) contributions required by funding regulations or laws, (2) discretionary contributions, and (3) noncash contributions. + References No definition available. + Details
Name: | fdx_DefinedBenefitPlanDecemberEmployerContributionsInCurrentFiscalYear
Namespace Prefix: | fdx_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Details
Name: | fdx_PensionPlansContributionsAbstract
Namespace Prefix: | fdx_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition The amount of required contributions made by the employer. + References No definition available. + Details
Name: | fdx_RequiredRetirementPlanContributionsByEmployer
Namespace Prefix: | fdx_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Subsequent voluntary pension contribution for the remainder 2015 + References No definition available. + Details
Name: | fdx_Subsequentvoluntarycontributionremainder2015
Namespace Prefix: | fdx_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition The amount of voluntary contributions made by the employer. + References No definition available. + Details
Name: | fdx_VoluntaryRetirementPlanContributionsByEmployer
Namespace Prefix: | fdx_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition The increase in the fair value of plan assets from contributions made by the employer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b)(3) -URI http://asc.fasb.org/extlink&oid=35743120&loc=d3e1928-114920 + Details
Name: | us-gaap_DefinedBenefitPlanContributionsByEmployer
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration