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Retirement Plans - Schedule of Retirement Plan Costs (Details) - USD ($) $ in Millions | 3 Months Ended
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Aug. 31, 2019 | Aug. 31, 2018
Pension And Other Postretirement Benefit Expense [Abstract] |  |
Defined benefit pension plans, net | $ 37 | $ 28
Defined contribution plans | 142 | 144
Postretirement healthcare plans | 22 | 19
Retirement plans costs | $ 201 | $ 191

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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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- 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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Namespace Prefix: | us-gaap_
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Period Type: | duration

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- References No definition available. + Details
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