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Commitments - Additional Information (Details) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Aug. 31, 2021 air-craft | Nov. 30, 2021 USD ($) air-craft
Other Aircraft Commitments Disclosure [Abstract] |  |
Deposit and Progress Payments | $ |  | $ 629
Lessee Disclosure [Abstract] |  |
Additional leases not yet commenced, undiscounted future payments | $ |  | $ 2,500
Minimum [Member] |  |
Lessee Disclosure [Abstract] |  |
Operating lease commencement date |  | 2022
Maximum [Member] |  |
Lessee Disclosure [Abstract] |  |
Operating lease commencement date |  | 2023
B777F [Member] |  |
Other Aircraft Commitments Disclosure [Abstract] |  |
Conditional Aircraft Commitments |  | 2
B767F [Member] |  |
Other Aircraft Commitments Disclosure [Abstract] |  |
Conditional Aircraft Commitments |  | 2
Number of additional aircraft agreed to purchase options exercised | 20 |
B767F Aircraft Delivered in 2025 [Member] |  |
Other Aircraft Commitments Disclosure [Abstract] |  |
Number of aircrafts rescheduled delivery | 10 |
Aircraft expected to be delivered, latest fiscal year | 2025 |
B767F Aircraft Delivered in 2024 [Member] |  |
Other Aircraft Commitments Disclosure [Abstract] |  |
Number of aircrafts rescheduled delivery | 10 |
Aircraft expected to be delivered, earliest fiscal year | 2024 |

X
- Definition Aircraft expected to be delivered earliest fiscal year. + References No definition available. + Details
Name: | fdx_AircraftExpectedToBeDeliveredEarliestFiscalYear
Namespace Prefix: | fdx_
Data Type: | xbrli:gYearItemType
Balance Type: | na
Period Type: | duration

X
- Definition Aircraft expected to be delivered latest fiscal year. + References No definition available. + Details
Name: | fdx_AircraftExpectedToBeDeliveredLatestFiscalYear
Namespace Prefix: | fdx_
Data Type: | xbrli:gYearItemType
Balance Type: | na
Period Type: | duration

X
- Definition Balance of deposits and progress payments on aircraft purchases and other planned aircraft-related transactions. + References No definition available. + Details
Name: | fdx_DepositAndProgressPayments
Namespace Prefix: | fdx_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Lessee, operating and finance lease, lease not yet commenced, undiscounted future payments. + References No definition available. + Details
Name: | fdx_LesseeOperatingAndFinanceLeaseLeaseNotYetCommencedUndiscountedFuturePayments
Namespace Prefix: | fdx_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Number of additional aircraft options exercised to purchase. + References No definition available. + Details
Name: | fdx_NumberOfAdditionalAircraftOptionsExercisedToPurchase
Namespace Prefix: | fdx_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition Number of aircrafts rescheduled delivery. + References No definition available. + Details
Name: | fdx_NumberOfAircraftsRescheduledDelivery
Namespace Prefix: | fdx_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition Number of conditional aircraft commitments. + References No definition available. + Details
Name: | fdx_NumberOfConditionalAircraftCommitments
Namespace Prefix: | fdx_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Operating lease commencement date. + References No definition available. + Details
Name: | fdx_OperatingLeaseCommencementDate
Namespace Prefix: | fdx_
Data Type: | xbrli:gYearItemType
Balance Type: | na
Period Type: | duration

X
- Definition Other aircraft commitments disclosure. + References No definition available. + Details
Name: | fdx_OtherAircraftCommitmentsDisclosureAbstract
Namespace Prefix: | fdx_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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

X
- Details
Name: | srt_RangeAxis=srt_MinimumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RangeAxis=srt_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LongTermPurchaseCommitmentByCategoryOfItemPurchasedAxis=fdx_Boeing777FreighterMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LongTermPurchaseCommitmentByCategoryOfItemPurchasedAxis=fdx_Boeing767FreighterMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LongTermPurchaseCommitmentByCategoryOfItemPurchasedAxis=fdx_Boeing767FreighterAgreementTwoMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LongTermPurchaseCommitmentByCategoryOfItemPurchasedAxis=fdx_Boeing767FreighterAgreementOneMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |