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Retirement Plans - Schedule of Retirement Plan Costs (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
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Nov. 30, 2018 | Nov. 30, 2017 | Nov. 30, 2018 | Nov. 30, 2017
Pension And Other Postretirement Benefit Expense [Abstract] |  |  |  |
Defined benefit pension plans, net | $ 29 | $ 37 | $ 57 | $ 74
Defined contribution plans | 133 | 124 | 277 | 251
Postretirement healthcare plans | 18 | 18 | 37 | 37
Retirement plans costs | $ 180 | $ 179 | $ 371 | $ 362

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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 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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Namespace Prefix: | fdx_
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- Definition Amount of cost for defined contribution plan. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 70 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=49170846&loc=d3e28014-114942 + Details
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- Definition Amount of cost (reversal of cost) for pension and other postretirement benefits. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
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Period Type: | duration

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- References No definition available. + Details
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