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BUSINESS SEGMENTS AND DISAGGREGATED REVENUE - Schedule of Revenue by Service Type (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Aug. 31, 2025 | Aug. 31, 2024
Entity Wide Information Revenue From External Customer [Line Items] |  |
Revenue | $ 22,244 | $ 21,579
Operating Segments | Total Federal Express Segment |  |
Entity Wide Information Revenue From External Customer [Line Items] |  |
Revenue | 19,116 | 18,305
Operating Segments | Total Federal Express Segment | Total package revenue |  |
Entity Wide Information Revenue From External Customer [Line Items] |  |
Revenue | 17,441 | 16,476
Operating Segments | Total Federal Express Segment | Total U.S. domestic package revenue |  |
Entity Wide Information Revenue From External Customer [Line Items] |  |
Revenue | 12,694 | 11,798
Operating Segments | Total Federal Express Segment | U.S. priority |  |
Entity Wide Information Revenue From External Customer [Line Items] |  |
Revenue | 2,767 | 2,591
Operating Segments | Total Federal Express Segment | U.S. deferred |  |
Entity Wide Information Revenue From External Customer [Line Items] |  |
Revenue | 1,273 | 1,151
Operating Segments | Total Federal Express Segment | U.S. ground |  |
Entity Wide Information Revenue From External Customer [Line Items] |  |
Revenue | 8,654 | 8,056
Operating Segments | Total Federal Express Segment | Total international export package revenue |  |
Entity Wide Information Revenue From External Customer [Line Items] |  |
Revenue | 3,612 | 3,566
Operating Segments | Total Federal Express Segment | International priority |  |
Entity Wide Information Revenue From External Customer [Line Items] |  |
Revenue | 2,258 | 2,206
Operating Segments | Total Federal Express Segment | International economy |  |
Entity Wide Information Revenue From External Customer [Line Items] |  |
Revenue | 1,354 | 1,360
Operating Segments | Total Federal Express Segment | International domestic |  |
Entity Wide Information Revenue From External Customer [Line Items] |  |
Revenue | 1,135 | 1,112
Operating Segments | Total Federal Express Segment | Total freight revenue |  |
Entity Wide Information Revenue From External Customer [Line Items] |  |
Revenue | 1,426 | 1,558
Operating Segments | Total Federal Express Segment | U.S. |  |
Entity Wide Information Revenue From External Customer [Line Items] |  |
Revenue | 303 | 569
Operating Segments | Total Federal Express Segment | International priority |  |
Entity Wide Information Revenue From External Customer [Line Items] |  |
Revenue | 595 | 526
Operating Segments | Total Federal Express Segment | International economy |  |
Entity Wide Information Revenue From External Customer [Line Items] |  |
Revenue | 528 | 463
Operating Segments | Total Federal Express Segment | Other |  |
Entity Wide Information Revenue From External Customer [Line Items] |  |
Revenue | 249 | 271
Operating Segments | FedEx Freight Segment |  |
Entity Wide Information Revenue From External Customer [Line Items] |  |
Revenue | 2,257 | 2,329
Other and eliminations |  |
Entity Wide Information Revenue From External Customer [Line Items] |  |
Revenue | $ 871 | $ 945

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