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Retirement Plans - Schedule of MTM Adjustments (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
May 31, 2020 | May 31, 2019 | May 31, 2020 | May 31, 2019 | May 31, 2018
Actuarial Gain Loss By Component Pre Tax [Abstract] |  |  |  |  |
Discount rate change |  |  | $ 2,997 | $ 1,780 | $ (613)
Demographic experience: |  |  |  |  |
Current year actuarial loss |  |  | 50 | 739 | 419
Change in future assumptions |  |  | (229) | 887 | (37)
Actual versus expected return on assets |  |  | (2,024) | 476 | 11
Annuity contract purchase |  |  |  |  | 210
Total MTM loss (gain) | $ 794 | $ 3,900 | $ 794 | $ 3,882 | $ (10)

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- Definition Actuarial gain loss by component pre-tax. + References No definition available. + Details
Name: | fdx_ActuarialGainLossByComponentPreTaxAbstract
Namespace Prefix: | fdx_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition The amount of actuarial gain/loss attributable to the annuity contract purchase. + References No definition available. + Details
Name: | fdx_AnnuityContractPurchase
Namespace Prefix: | fdx_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Change in future assumptions. + References No definition available. + Details
Name: | fdx_ChangeInFutureAssumptions
Namespace Prefix: | fdx_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Current year actuarial loss. + References No definition available. + Details
Name: | fdx_CurrentYearActuarialLoss
Namespace Prefix: | fdx_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Demographic experience. + References No definition available. + Details
Name: | fdx_DemographicExperienceAbstract
Namespace Prefix: | fdx_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition The amount of actuarial gain/loss attributable to the discount rate. + References No definition available. + Details
Name: | fdx_GainLossOnDiscountRate
Namespace Prefix: | fdx_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition The annual retirement plan amount recorded for actuarial gains and losses calculated using actual fair value of plan assets. + References No definition available. + Details
Name: | fdx_RetirementPlansMarketToMarketAdjustment
Namespace Prefix: | fdx_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition The amount of actuarial gain/loss attributable to the return on assets. + References No definition available. + Details
Name: | fdx_ReturnOnAssets
Namespace Prefix: | fdx_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration