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General - Schedule of Revenue by Service Type (Details) - USD ($)
$ in Millions
3 Months Ended
Aug. 31, 2023
Aug. 31, 2022
Entity Wide Information Revenue From External Customer [Line Items]    
Revenues $ 21,681 $ 23,242
Operating Segments [Member] | FedEx Express Segment [Member]    
Entity Wide Information Revenue From External Customer [Line Items]    
Revenues 10,085 11,127
Operating Segments [Member] | FedEx Express Segment [Member] | U.S. overnight box [Member]    
Entity Wide Information Revenue From External Customer [Line Items]    
Revenues 2,188 2,316
Operating Segments [Member] | FedEx Express Segment [Member] | U.S. overnight envelope [Member]    
Entity Wide Information Revenue From External Customer [Line Items]    
Revenues 485 525
Operating Segments [Member] | FedEx Express Segment [Member] | U.S. deferred [Member]    
Entity Wide Information Revenue From External Customer [Line Items]    
Revenues 1,187 1,287
Operating Segments [Member] | FedEx Express Segment [Member] | Total U.S. domestic package revenue [Member]    
Entity Wide Information Revenue From External Customer [Line Items]    
Revenues 3,860 4,128
Operating Segments [Member] | FedEx Express Segment [Member] | International priority [Member]    
Entity Wide Information Revenue From External Customer [Line Items]    
Revenues 2,327 2,897
Operating Segments [Member] | FedEx Express Segment [Member] | International economy [Member]    
Entity Wide Information Revenue From External Customer [Line Items]    
Revenues 1,021 707
Operating Segments [Member] | FedEx Express Segment [Member] | Total international export package revenue [Member]    
Entity Wide Information Revenue From External Customer [Line Items]    
Revenues 3,348 3,604
Operating Segments [Member] | FedEx Express Segment [Member] | International domestic [Member]    
Entity Wide Information Revenue From External Customer [Line Items]    
Revenues [1] 1,024 974
Operating Segments [Member] | FedEx Express Segment [Member] | Total package revenue [Member]    
Entity Wide Information Revenue From External Customer [Line Items]    
Revenues 8,232 8,706
Operating Segments [Member] | FedEx Express Segment [Member] | U.S. freight [Member]    
Entity Wide Information Revenue From External Customer [Line Items]    
Revenues 582 796
Operating Segments [Member] | FedEx Express Segment [Member] | International priority freight [Member]    
Entity Wide Information Revenue From External Customer [Line Items]    
Revenues 553 888
Operating Segments [Member] | FedEx Express Segment [Member] | International Economy Freight [Member]    
Entity Wide Information Revenue From External Customer [Line Items]    
Revenues 425 377
Operating Segments [Member] | FedEx Express Segment [Member] | International Airfreight [Member]    
Entity Wide Information Revenue From External Customer [Line Items]    
Revenues 32 41
Operating Segments [Member] | FedEx Express Segment [Member] | Total freight revenue [Member]    
Entity Wide Information Revenue From External Customer [Line Items]    
Revenues 1,592 2,102
Operating Segments [Member] | FedEx Express Segment [Member] | Other [Member]    
Entity Wide Information Revenue From External Customer [Line Items]    
Revenues 261 319
Operating Segments [Member] | FedEx Ground Segment [Member]    
Entity Wide Information Revenue From External Customer [Line Items]    
Revenues 8,420 8,160
Operating Segments [Member] | FedEx Freight Segment [Member]    
Entity Wide Information Revenue From External Customer [Line Items]    
Revenues 2,291 2,723
Operating Segments [Member] | FedEx Services Segment [Member]    
Entity Wide Information Revenue From External Customer [Line Items]    
Revenues 72 70
Other and eliminations [Member]    
Entity Wide Information Revenue From External Customer [Line Items]    
Revenues [2] $ 813 $ 1,162
[1] International domestic revenue relates to our international intra-country operations.
[2] Includes the FedEx Office and Print Services, Inc. (“FedEx Office”), FedEx Logistics, Inc. (“FedEx Logistics”), and FedEx Dataworks, Inc. (“FedEx Dataworks”) operating segments.