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General - Schedule of Revenue by Service Type (Details) - USD ($)
$ in Millions
3 Months Ended
Aug. 31, 2018
Aug. 31, 2017
Entity Wide Information Revenue From External Customer [Line Items]    
Revenues $ 17,052 $ 15,297
FedEx Express Segment [Member]    
Entity Wide Information Revenue From External Customer [Line Items]    
Revenues 9,222 8,400
FedEx Ground Segment [Member]    
Entity Wide Information Revenue From External Customer [Line Items]    
Revenues 4,799 4,245
FedEx Freight Segment [Member]    
Entity Wide Information Revenue From External Customer [Line Items]    
Revenues 1,959 1,664
FedEx Services Segment [Member]    
Entity Wide Information Revenue From External Customer [Line Items]    
Revenues 417 400
Operating Segments | FedEx Express Segment [Member]    
Entity Wide Information Revenue From External Customer [Line Items]    
Revenues 9,222 8,400
Operating Segments | FedEx Express Segment [Member] | U.S. overnight box [Member]    
Entity Wide Information Revenue From External Customer [Line Items]    
Revenues 1,886 1,750
Operating Segments | FedEx Express Segment [Member] | U.S. overnight envelope [Member]    
Entity Wide Information Revenue From External Customer [Line Items]    
Revenues 468 450
Operating Segments | FedEx Express Segment [Member] | U.S. deferred [Member]    
Entity Wide Information Revenue From External Customer [Line Items]    
Revenues 952 878
Operating Segments | FedEx Express Segment [Member] | Total U.S. domestic package revenue [Member]    
Entity Wide Information Revenue From External Customer [Line Items]    
Revenues 3,306 3,078
Operating Segments | FedEx Express Segment [Member] | International priority [Member]    
Entity Wide Information Revenue From External Customer [Line Items]    
Revenues 1,848 1,741
Operating Segments | FedEx Express Segment [Member] | International economy [Member]    
Entity Wide Information Revenue From External Customer [Line Items]    
Revenues 850 770
Operating Segments | FedEx Express Segment [Member] | Total international export package revenue [Member]    
Entity Wide Information Revenue From External Customer [Line Items]    
Revenues 2,698 2,511
Operating Segments | FedEx Express Segment [Member] | International domestic [Member]    
Entity Wide Information Revenue From External Customer [Line Items]    
Revenues [1] 1,127 1,044
Operating Segments | FedEx Express Segment [Member] | Total package revenue [Member]    
Entity Wide Information Revenue From External Customer [Line Items]    
Revenues 7,131 6,633
Operating Segments | FedEx Express Segment [Member] | U.S. freight [Member]    
Entity Wide Information Revenue From External Customer [Line Items]    
Revenues 730 613
Operating Segments | FedEx Express Segment [Member] | International priority freight [Member]    
Entity Wide Information Revenue From External Customer [Line Items]    
Revenues 551 470
Operating Segments | FedEx Express Segment [Member] | International Economy Freight    
Entity Wide Information Revenue From External Customer [Line Items]    
Revenues 519 381
Operating Segments | FedEx Express Segment [Member] | International Airfreight [Member]    
Entity Wide Information Revenue From External Customer [Line Items]    
Revenues 85 83
Operating Segments | FedEx Express Segment [Member] | Total freight revenue [Member]    
Entity Wide Information Revenue From External Customer [Line Items]    
Revenues 1,885 1,547
Operating Segments | FedEx Express Segment [Member] | Other [Member]    
Entity Wide Information Revenue From External Customer [Line Items]    
Revenues 206 220
Operating Segments | FedEx Ground Segment [Member]    
Entity Wide Information Revenue From External Customer [Line Items]    
Revenues 4,799 4,245
Operating Segments | FedEx Freight Segment [Member]    
Entity Wide Information Revenue From External Customer [Line Items]    
Revenues 1,959 1,664
Operating Segments | FedEx Services Segment [Member]    
Entity Wide Information Revenue From External Customer [Line Items]    
Revenues 417 400
Operating Segments | FedEx Trade Networks Segment [Member]    
Entity Wide Information Revenue From External Customer [Line Items]    
Revenues 884 799
Eliminations [Member]    
Entity Wide Information Revenue From External Customer [Line Items]    
Revenues $ (229) $ (211)
[1] International domestic revenues relate to our intra-country operations.