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BUSINESS SEGMENTS AND DISAGGREGATED REVENUE - Schedule of Revenue by Service Type (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
May 31, 2025 | May 31, 2024 | May 31, 2023
Entity Wide Information Revenue From External Customer [Line Items] |  |  |
Revenue | $ 87,926 | $ 87,693 | $ 90,155
Operating Segments | Federal Express segment |  |  |
Entity Wide Information Revenue From External Customer [Line Items] |  |  |
Revenue | 75,304 | 74,663 | 75,884
Operating Segments | Federal Express segment | Total package revenue |  |  |
Entity Wide Information Revenue From External Customer [Line Items] |  |  |
Revenue | 68,507 | 67,216 | 67,171
Operating Segments | Federal Express segment | Total U.S. domestic package revenue |  |  |
Entity Wide Information Revenue From External Customer [Line Items] |  |  |
Revenue | 49,414 | 48,450 | 48,374
Operating Segments | Federal Express segment | U.S. priority revenue |  |  |
Entity Wide Information Revenue From External Customer [Line Items] |  |  |
Revenue | 10,520 | 10,543 | 10,896
Operating Segments | Federal Express segment | U.S. deferred revenue |  |  |
Entity Wide Information Revenue From External Customer [Line Items] |  |  |
Revenue | 5,007 | 4,926 | 5,126
Operating Segments | Federal Express segment | U.S. ground revenue |  |  |
Entity Wide Information Revenue From External Customer [Line Items] |  |  |
Revenue | 33,887 | 32,981 | 32,352
Operating Segments | Federal Express segment | Total international export package revenue |  |  |
Entity Wide Information Revenue From External Customer [Line Items] |  |  |
Revenue | 14,598 | 14,107 | 14,245
Operating Segments | Federal Express segment | International priority |  |  |
Entity Wide Information Revenue From External Customer [Line Items] |  |  |
Revenue | 8,737 | 9,454 | 10,938
Operating Segments | Federal Express segment | International economy |  |  |
Entity Wide Information Revenue From External Customer [Line Items] |  |  |
Revenue | 5,861 | 4,653 | 3,307
Operating Segments | Federal Express segment | International domestic |  |  |
Entity Wide Information Revenue From External Customer [Line Items] |  |  |
Revenue | 4,495 | 4,659 | 4,552
Operating Segments | Federal Express segment | Total freight revenue |  |  |
Entity Wide Information Revenue From External Customer [Line Items] |  |  |
Revenue | 5,831 | 6,470 | 7,661
Operating Segments | Federal Express segment | U.S. |  |  |
Entity Wide Information Revenue From External Customer [Line Items] |  |  |
Revenue | 1,536 | 2,391 | 2,883
Operating Segments | Federal Express segment | International priority |  |  |
Entity Wide Information Revenue From External Customer [Line Items] |  |  |
Revenue | 2,320 | 2,205 | 3,059
Operating Segments | Federal Express segment | International economy |  |  |
Entity Wide Information Revenue From External Customer [Line Items] |  |  |
Revenue | 1,975 | 1,874 | 1,719
Operating Segments | Federal Express segment | Other |  |  |
Entity Wide Information Revenue From External Customer [Line Items] |  |  |
Revenue | 966 | 977 | 1,052
Operating Segments | FedEx Freight Segment |  |  |
Entity Wide Information Revenue From External Customer [Line Items] |  |  |
Revenue | 8,892 | 9,429 | 10,084
Other and eliminations |  |  |
Entity Wide Information Revenue From External Customer [Line Items] |  |  |
Revenue | $ 3,730 | $ 3,601 | $ 4,187

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