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Business Segment Information - Schedule of Segment Information (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Feb. 29, 2020 | Feb. 28, 2019 | Feb. 29, 2020 | Feb. 28, 2019
Segment Reporting Information [Line Items] |  |  |  |
Revenues | $ 17,487 | $ 17,010 | $ 51,859 | $ 51,886
Operating income (loss) | 411 | 911 | 1,942 | 3,150
Operating Segments | FedEx Express Segment [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | 8,924 | 9,005 | 26,953 | 27,831
Operating income (loss) | 137 | 389 | 658 | 1,407
Operating Segments | FedEx Ground Segment [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | 5,845 | 5,261 | 16,339 | 15,202
Operating income (loss) | 355 | 586 | 1,341 | 1,852
Operating Segments | FedEx Freight Segment [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | 1,738 | 1,750 | 5,487 | 5,627
Operating income (loss) | 113 | 97 | 448 | 421
Operating Segments | FedEx Services Segment [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | 6 | 4 | 15 | 17
Corporate, Other and Eliminations [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | 974 | 990 | 3,065 | 3,209
Operating income (loss) | $ (194) | $ (161) | $ (505) | $ (530)

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