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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