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Income Taxes (Details 2) - USD ($) $ in Millions | 12 Months Ended
--- | ---
May. 31, 2015 | May. 31, 2014 | May. 31, 2013
Pre Tax Earnings Of Foreign Operations [Abstract] |  |  |
Earnings (Loss) From Foreign Operations | $ 773 | $ 412 | $ (55)

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- Definition Sum of foreign operating profit and nonoperating income (expense) before income (loss) from equity method investments, income taxes, extraordinary items, cumulative effects of changes in accounting principles, and noncontrolling interest. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- References No definition available. + Details
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Namespace Prefix: | fdx_
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Balance Type: | na
Period Type: | duration