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RETIREMENT PLANS - Schedule of Retirement Plan Costs (Details) - USD ($) $ in Millions | 12 Months Ended
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May 31, 2025 | May 31, 2024 | May 31, 2023
Retirement Benefits [Abstract] |  |  |
Defined benefit pension plans | $ 278 | $ 363 | $ 236
Defined contribution plans | 1,144 | 968 | 955
Postretirement healthcare plans | 87 | 85 | 92
Pension plans MTM gain | (515) | (561) | (650)
Retirement plans costs | $ 994 | $ 855 | $ 633

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- Definition The total amount of net periodic benefit cost for pension plans for the period. Periodic benefit costs include the following components: service cost, interest cost, expected return on plan assets, gain or loss, prior service cost or credit, transition asset or obligation, and gain or loss due to settlements or curtailments. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition The annual Pension plan amount recorded for actuarial gains and losses calculated using actual fair value of plan assets. + References No definition available. + Details
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Namespace Prefix: | fdx_
Data Type: | xbrli:monetaryItemType
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- Definition The total amount of net periodic benefit cost for defined benefit postretirement healthcare plans for the period. Periodic benefit costs include the following components: service cost, interest cost, expected return on plan assets, gain or loss, prior service cost or credit, transition asset or obligation, and gain or loss due to settlements or curtailments. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- References No definition available. + Details
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- Definition Amount of cost for defined contribution plan. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 70 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480794/715-70-50-1 + Details
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- Definition Amount of cost (reversal of cost) for pension and other postretirement benefits. + References No definition available. + Details
Name: | us-gaap_PensionAndOtherPostretirementBenefitExpense
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration