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Retirement Plans - Schedule of MTM Adjustments (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
May 31, 2018 | May 31, 2017 | May 31, 2018 | May 31, 2017 | May 31, 2016
Actuarial Gain Loss By Component Pre Tax [Abstract] |  |  |  |  |
Discount rate changes |  |  | $ (613) | $ 266 | $ 1,129
Demographic assumption experience |  |  | 382 | 450 | (916)
Annuity contract purchase |  |  | 210 |  |
Actual versus expected return on assets |  |  | 11 | (740) | 1,285
Total mark-to-market (gain) loss | $ (10) | $ (24) | $ (10) | $ (24) | $ 1,498

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- Definition Actuarial gain loss by component pre-tax. + References No definition available. + Details
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Balance Type: | na
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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
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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_
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- Definition The amount of actuarial gain/loss attributable to demographic assumptions. + References No definition available. + Details
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Namespace Prefix: | fdx_
Data Type: | xbrli:monetaryItemType
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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
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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
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