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Business Segment Information - Schedule of Segment Information (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Feb. 28, 2018 | Feb. 28, 2017 | Feb. 28, 2018 | Feb. 28, 2017
Segment Reporting Information [Line Items] |  |  |  |
Revenues | $ 16,526 | $ 14,997 | $ 48,136 | $ 44,591
Operating Income | 1,001 | 1,025 | 3,380 | 3,456
FedEx Express Segment [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | 9,370 | 8,569 | 27,376 | 25,671
Operating Income | 424 | 557 | 1,574 | 1,873
FedEx Ground Segment [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | 5,222 | 4,688 | 14,790 | 13,397
Operating Income | 634 | 515 | 1,781 | 1,590
FedEx Freight Segment [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | 1,694 | 1,492 | 5,208 | 4,747
Operating Income | 55 | 41 | 349 | 264
FedEx Services Segment [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | 397 | 389 | 1,213 | 1,198
Eliminations, Corporate and Other [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | (157) | (141) | (451) | (422)
Operating Income | $ (112) | $ (88) | $ (324) | $ (271)

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