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General - Schedule of Revenue by Service Type (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Feb. 28, 2021
Feb. 29, 2020
Feb. 28, 2021
Feb. 29, 2020
Entity Wide Information Revenue From External Customer [Line Items]        
Revenues $ 21,510 $ 17,487 $ 61,394 $ 51,859
Operating Segments | FedEx Express Segment [Member]        
Entity Wide Information Revenue From External Customer [Line Items]        
Revenues 10,788 8,924 30,803 26,953
Operating Segments | FedEx Express Segment [Member] | U.S. overnight box [Member]        
Entity Wide Information Revenue From External Customer [Line Items]        
Revenues 2,078 1,865 5,951 5,595
Operating Segments | FedEx Express Segment [Member] | U.S. overnight envelope [Member]        
Entity Wide Information Revenue From External Customer [Line Items]        
Revenues 444 459 1,305 1,395
Operating Segments | FedEx Express Segment [Member] | U.S. deferred [Member]        
Entity Wide Information Revenue From External Customer [Line Items]        
Revenues 1,418 1,127 3,718 3,063
Operating Segments | FedEx Express Segment [Member] | Total U.S. domestic package revenue [Member]        
Entity Wide Information Revenue From External Customer [Line Items]        
Revenues 3,940 3,451 10,974 10,053
Operating Segments | FedEx Express Segment [Member] | International priority [Member]        
Entity Wide Information Revenue From External Customer [Line Items]        
Revenues 2,596 1,710 7,423 5,344
Operating Segments | FedEx Express Segment [Member] | International economy [Member]        
Entity Wide Information Revenue From External Customer [Line Items]        
Revenues 653 810 1,927 2,538
Operating Segments | FedEx Express Segment [Member] | Total international export package revenue [Member]        
Entity Wide Information Revenue From External Customer [Line Items]        
Revenues 3,249 2,520 9,350 7,882
Operating Segments | FedEx Express Segment [Member] | International domestic [Member]        
Entity Wide Information Revenue From External Customer [Line Items]        
Revenues [1] 1,162 1,075 3,456 3,316
Operating Segments | FedEx Express Segment [Member] | Total package revenue [Member]        
Entity Wide Information Revenue From External Customer [Line Items]        
Revenues 8,351 7,046 23,780 21,251
Operating Segments | FedEx Express Segment [Member] | U.S. freight [Member]        
Entity Wide Information Revenue From External Customer [Line Items]        
Revenues 860 739 2,492 2,132
Operating Segments | FedEx Express Segment [Member] | International priority freight [Member]        
Entity Wide Information Revenue From External Customer [Line Items]        
Revenues 775 439 2,165 1,376
Operating Segments | FedEx Express Segment [Member] | International Economy Freight        
Entity Wide Information Revenue From External Customer [Line Items]        
Revenues 383 499 1,162 1,556
Operating Segments | FedEx Express Segment [Member] | International Airfreight [Member]        
Entity Wide Information Revenue From External Customer [Line Items]        
Revenues 56 61 196 197
Operating Segments | FedEx Express Segment [Member] | Total freight revenue [Member]        
Entity Wide Information Revenue From External Customer [Line Items]        
Revenues 2,074 1,738 6,015 5,261
Operating Segments | FedEx Express Segment [Member] | Other [Member]        
Entity Wide Information Revenue From External Customer [Line Items]        
Revenues [2] 363 140 1,008 441
Operating Segments | FedEx Ground Segment [Member]        
Entity Wide Information Revenue From External Customer [Line Items]        
Revenues 7,980 5,845 22,364 16,339
Operating Segments | FedEx Freight Segment [Member]        
Entity Wide Information Revenue From External Customer [Line Items]        
Revenues 1,836 1,738 5,598 5,487
Operating Segments | FedEx Services Segment [Member]        
Entity Wide Information Revenue From External Customer [Line Items]        
Revenues 8 6 24 15
Other and eliminations [Member]        
Entity Wide Information Revenue From External Customer [Line Items]        
Revenues [3] $ 898 $ 974 $ 2,605 $ 3,065
[1] International domestic revenue relates to our international intra-country operations.
[2]

Includes the operations of FedEx Custom Critical, Inc. (“FedEx Custom Critical”) and FedEx Cross Border Holdings, Inc. (“FedEx Cross Border”) for the periods ended February 28, 2021. Effective March 1, 2020 and June 1, 2020, respectively, the results of FedEx Custom Critical and FedEx Cross Border are included in the Federal Express Corporation (“FedEx Express”) segment prospectively.
[3] Includes the FedEx Logistics, Inc. (“FedEx Logistics”) and FedEx Office and Print Services, Inc. (“FedEx Office”) operating segments, as well as the financial results of ShopRunner, Inc. (“ShopRunner”) beginning December 23, 2020.