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Business Segment Information - Schedule of Segment Information (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Aug. 31, 2017 | Aug. 31, 2016
Segment Reporting Information [Line Items] |  |
Revenues | $ 15,297 | $ 14,663
Operating Income | 1,117 | 1,264
FedEx Express Segment [Member] |  |
Segment Reporting Information [Line Items] |  |
Revenues | 8,652 | 8,460
Operating Income | 433 | 610
FedEx Ground Segment [Member] |  |
Segment Reporting Information [Line Items] |  |
Revenues | 4,639 | 4,290
Operating Income | 626 | 610
FedEx Freight Segment [Member] |  |
Segment Reporting Information [Line Items] |  |
Revenues | 1,752 | 1,658
Operating Income | 176 | 135
FedEx Services Segment [Member] |  |
Segment Reporting Information [Line Items] |  |
Revenues | 400 | 395
Eliminations, Corporate and Other [Member] |  |
Segment Reporting Information [Line Items] |  |
Revenues | (146) | (140)
Operating Income | $ (118) | $ (91)

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- Definition Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 + Details
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