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Business Segment Information - Schedule of Segment Information (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Aug. 31, 2018 | Aug. 31, 2017
Segment Reporting Information [Line Items] |  |
Revenues | $ 17,052 | $ 15,297
Operating income (loss) | 1,071 | 971
FedEx Express Segment [Member] |  |
Segment Reporting Information [Line Items] |  |
Revenues | 9,222 | 8,400
Operating income (loss) | 367 | 320
FedEx Ground Segment [Member] |  |
Segment Reporting Information [Line Items] |  |
Revenues | 4,799 | 4,245
Operating income (loss) | 667 | 606
FedEx Freight Segment [Member] |  |
Segment Reporting Information [Line Items] |  |
Revenues | 1,959 | 1,664
Operating income (loss) | 176 | 165
FedEx Services Segment [Member] |  |
Segment Reporting Information [Line Items] |  |
Revenues | 417 | 400
Corporate, Other and Eliminations [Member] |  |
Segment Reporting Information [Line Items] |  |
Revenues | 655 | 588
Operating income (loss) | $ (139) | $ (120)

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