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BUSINESS SEGMENTS AND DISAGGREGATED REVENUE - Schedule of Revenue by Service Type (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Nov. 30, 2025
Nov. 30, 2024
Nov. 30, 2025
Nov. 30, 2024
Entity Wide Information Revenue From External Customer [Line Items]        
Revenue $ 23,469 $ 21,967 $ 45,713 $ 43,546
Operating Segments | Total Federal Express segment        
Entity Wide Information Revenue From External Customer [Line Items]        
Revenue 20,433 18,841 39,549 37,146
Operating Segments | Total Federal Express segment | Total package revenue        
Entity Wide Information Revenue From External Customer [Line Items]        
Revenue 18,563 17,027 36,004 33,503
Operating Segments | Total Federal Express segment | Total U.S. domestic package revenue        
Entity Wide Information Revenue From External Customer [Line Items]        
Revenue 13,412 12,018 26,106 23,816
Operating Segments | Total Federal Express segment | U.S. priority        
Entity Wide Information Revenue From External Customer [Line Items]        
Revenue 2,843 2,563 5,610 5,154
Operating Segments | Total Federal Express segment | U.S. deferred        
Entity Wide Information Revenue From External Customer [Line Items]        
Revenue 1,396 1,199 2,669 2,350
Operating Segments | Total Federal Express segment | U.S. ground        
Entity Wide Information Revenue From External Customer [Line Items]        
Revenue 9,173 8,256 17,827 16,312
Operating Segments | Total Federal Express segment | Total international export package revenue        
Entity Wide Information Revenue From External Customer [Line Items]        
Revenue 3,894 3,819 7,506 7,385
Operating Segments | Total Federal Express segment | International priority        
Entity Wide Information Revenue From External Customer [Line Items]        
Revenue 2,383 2,231 4,641 4,437
Operating Segments | Total Federal Express segment | International economy        
Entity Wide Information Revenue From External Customer [Line Items]        
Revenue 1,511 1,588 2,865 2,948
Operating Segments | Total Federal Express segment | International domestic        
Entity Wide Information Revenue From External Customer [Line Items]        
Revenue 1,257 1,190 2,392 2,302
Operating Segments | Total Federal Express segment | Total freight revenue        
Entity Wide Information Revenue From External Customer [Line Items]        
Revenue 1,503 1,552 2,929 3,110
Operating Segments | Total Federal Express segment | U.S.        
Entity Wide Information Revenue From External Customer [Line Items]        
Revenue 304 383 607 952
Operating Segments | Total Federal Express segment | International priority        
Entity Wide Information Revenue From External Customer [Line Items]        
Revenue 617 640 1,212 1,166
Operating Segments | Total Federal Express segment | International economy        
Entity Wide Information Revenue From External Customer [Line Items]        
Revenue 582 529 1,110 992
Operating Segments | Total Federal Express segment | Other        
Entity Wide Information Revenue From External Customer [Line Items]        
Revenue 367 262 616 533
Operating Segments | FedEx Freight segment        
Entity Wide Information Revenue From External Customer [Line Items]        
Revenue 2,139 2,177 4,396 4,506
Other and eliminations        
Entity Wide Information Revenue From External Customer [Line Items]        
Revenue $ 897 $ 949 $ 1,768 $ 1,894