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Business Segment Information - Schedule of Segment Information (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Aug. 31, 2023 | Aug. 31, 2022
Segment Reporting Information [Line Items] |  |
Revenue | $ 21,681 | $ 23,242
Operating income (loss) | 1,485 | 1,191
Operating Segments [Member] | FedEx Express Segment [Member] |  |
Segment Reporting Information [Line Items] |  |
Revenue | 10,085 | 11,127
Operating income (loss) | 205 | 174
Operating Segments [Member] | FedEx Ground Segment [Member] |  |
Segment Reporting Information [Line Items] |  |
Revenue | 8,420 | 8,160
Operating income (loss) | 1,103 | 694
Operating Segments [Member] | FedEx Freight Segment [Member] |  |
Segment Reporting Information [Line Items] |  |
Revenue | 2,291 | 2,723
Operating income (loss) | 481 | 651
Operating Segments [Member] | FedEx Services Segment [Member] |  |
Segment Reporting Information [Line Items] |  |
Revenue | 72 | 70
Corporate, Other and Eliminations [Member] |  |
Segment Reporting Information [Line Items] |  |
Revenue | 813 | 1,162
Operating income (loss) | $ (304) | $ (328)

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