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Retirement Plans - Schedule of Pre-tax-mark-to-market Adjustments (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
May 31, 2017 | May 31, 2016 | May 31, 2017 | May 31, 2016 | May 31, 2015
Actuarial Gain Loss By Component Pre Tax [Abstract] |  |  |  |  |
Actual versus expected return on assets |  |  | $ (740) | $ 1,285 | $ (35)
Discount rate changes |  |  | 266 | 1,129 | 791
Demographic assumption experience |  |  | 450 | (916) | 1,434
Total mark-to-market (gain) loss | $ (24) | $ 1,500 | $ (24) | $ 1,498 | $ 2,190

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- Definition Actuarial gain loss by component pre-tax. + References No definition available. + Details
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- Definition The amount of actuarial gain/loss attributable to the discount rate. + References No definition available. + Details
Name: | fdx_DiscountRatesMTM
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- Definition The amount of actuarial gain/loss attributable to demographic assumptions. + References No definition available. + Details
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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
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- Definition The amount of actuarial gain/loss attributable to the return on assets. + References No definition available. + Details
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