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Business Segment Information (Details 2) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
May. 31, 2015 USD ($) | May. 31, 2015 USD ($) | May. 31, 2014 USD ($) | May. 31, 2013 USD ($)
Business Segment Information Table Detail [Line Items] |  |  |  |
Business Realignment Costs |  |  |  | $ 560
Asset Impairment Charges | $ 276 |  |  |
Ground legal reserve | 197 |  |  |
Mark to Market pension accounting | $ 2,200 |  |  |
FedEx Express Segment [Member] |  |  |  |
Business Segment Information Table Detail [Line Items] |  |  |  |
Business Realignment Costs |  |  | $ 405 |
Asset Impairment Charges |  | $ 276 | $ 100 |
Number Of Impaired Aircraft |  |  | 10 |
FedEx Ground Segment [Member] |  |  |  |
Business Segment Information Table Detail [Line Items] |  |  |  |
Business Realignment Costs |  |  |  | 105
Ground legal reserve |  | 197 |  |
FedEx Freight Segment [Member] |  |  |  |
Business Segment Information Table Detail [Line Items] |  |  |  |
Business Realignment Costs |  |  |  | 50
Corporate, eliminations and other [Member] |  |  |  |
Business Segment Information Table Detail [Line Items] |  |  |  |
Mark to Market pension accounting |  | $ 2,200 | $ 15 | $ (1,400)

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