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Description of Business Segments and Summary of Significant Accounting Policies - Schedule of Revenue by Service Type (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Feb. 28, 2025
Feb. 29, 2024
Feb. 28, 2025
Feb. 29, 2024
Entity Wide Information Revenue From External Customer [Line Items]        
Revenues $ 22,160 $ 21,738 $ 65,706 $ 65,584
Operating Segments [Member] | Federal Express Segment [Member]        
Entity Wide Information Revenue From External Customer [Line Items]        
Revenues 19,181 18,672 56,327 55,871
Operating Segments [Member] | Federal Express Segment [Member] | Package Revenue [Member]        
Entity Wide Information Revenue From External Customer [Line Items]        
Revenues 17,658 16,837 51,161 50,321
Operating Segments [Member] | Federal Express Segment [Member] | Package Revenue [Member] | U.S. priority [Member]        
Entity Wide Information Revenue From External Customer [Line Items]        
Revenues 2,646 2,595 7,800 7,873
Operating Segments [Member] | Federal Express Segment [Member] | Package Revenue [Member] | U.S. deferred [Member]        
Entity Wide Information Revenue From External Customer [Line Items]        
Revenues 1,386 1,316 3,736 3,710
Operating Segments [Member] | Federal Express Segment [Member] | Package Revenue [Member] | U.S. ground [Member]        
Entity Wide Information Revenue From External Customer [Line Items]        
Revenues 8,986 8,363 25,298 24,805
Operating Segments [Member] | Federal Express Segment [Member] | Package Revenue [Member] | Total U.S [Member]        
Entity Wide Information Revenue From External Customer [Line Items]        
Revenues 13,018 12,274 36,834 36,388
Operating Segments [Member] | Federal Express Segment [Member] | Package Revenue [Member] | International priority [Member]        
Entity Wide Information Revenue From External Customer [Line Items]        
Revenues 2,097 2,317 6,534 7,034
Operating Segments [Member] | Federal Express Segment [Member] | Package Revenue [Member] | International economy [Member]        
Entity Wide Information Revenue From External Customer [Line Items]        
Revenues 1,465 1,107 4,413 3,407
Operating Segments [Member] | Federal Express Segment [Member] | Package Revenue [Member] | Total international export package revenue [Member]        
Entity Wide Information Revenue From External Customer [Line Items]        
Revenues 3,562 3,424 10,947 10,441
Operating Segments [Member] | Federal Express Segment [Member] | Package Revenue [Member] | International domestic [Member]        
Entity Wide Information Revenue From External Customer [Line Items]        
Revenues [1] 1,078 1,139 3,380 3,492
Operating Segments [Member] | Federal Express Segment [Member] | Total freight revenue [Member]        
Entity Wide Information Revenue From External Customer [Line Items]        
Revenues 1,307 1,599 4,417 4,816
Operating Segments [Member] | Federal Express Segment [Member] | Total freight revenue [Member] | Total U.S [Member]        
Entity Wide Information Revenue From External Customer [Line Items]        
Revenues 286 641 1,238 1,795
Operating Segments [Member] | Federal Express Segment [Member] | Total freight revenue [Member] | International priority [Member]        
Entity Wide Information Revenue From External Customer [Line Items]        
Revenues 551 520 1,717 1,641
Operating Segments [Member] | Federal Express Segment [Member] | Total freight revenue [Member] | International economy [Member]        
Entity Wide Information Revenue From External Customer [Line Items]        
Revenues 470 438 1,462 1,380
Operating Segments [Member] | Federal Express Segment [Member] | Other [Member]        
Entity Wide Information Revenue From External Customer [Line Items]        
Revenues 216 236 749 734
Operating Segments [Member] | FedEx Freight Segment [Member]        
Entity Wide Information Revenue From External Customer [Line Items]        
Revenues 2,089 2,205 6,595 7,042
Other and eliminations [Member]        
Entity Wide Information Revenue From External Customer [Line Items]        
Revenues [2] $ 890 $ 861 $ 2,784 $ 2,671
[1] International domestic revenue relates to our international intra-country operations.
[2] Includes the FedEx Dataworks, Inc. (“FedEx Dataworks”), FedEx Office and Print Services, Inc. (“FedEx Office”), and FedEx Logistics, Inc. (“FedEx Logistics”) operating segments.