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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