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Retirement Plans - Schedule of MTM Adjustments (Details) - USD ($) $ in Millions | 12 Months Ended
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May 31, 2021 | May 31, 2020 | May 31, 2019
Actuarial Gain Loss By Component Pre Tax [Abstract] |  |  |
Actual versus expected return on assets | $ (1,712) | $ (2,024) | $ 476
Discount rate change | (397) | 2,997 | 1,780
Demographic experience: |  |  |
Current year actuarial loss | 302 | 50 | 739
Change in future assumptions | 685 | (229) | 887
Curtailment gain on TNT Netherlands pension plan | (54) |  |
Total MTM (gain) loss | $ (1,176) | $ 794 | $ 3,882

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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 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_
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- Definition Defined benefit plan, mark to market adjustment, gain (loss) due to curtailment. + References No definition available. + Details
Name: | fdx_DefinedBenefitPlanMarkToMarketAdjustmentGainLossDueToCurtailment
Namespace Prefix: | fdx_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
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- Definition Demographic experience. + References No definition available. + Details
Name: | fdx_DemographicExperienceAbstract
Namespace Prefix: | fdx_
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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
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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_RetirementPlansMarkToMarketAdjustment
Namespace Prefix: | fdx_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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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