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BUSINESS SEGMENTS AND DISAGGREGATED REVENUE - Schedule of Geographical Information (Details) - USD ($)
$ in Millions
 12 Months Ended
May 31, 2025
May 31, 2024
May 31, 2023
Revenues From External Customers And Long Lived Assets [Line Items]      
Revenue $ 87,926 $ 87,693 $ 90,155
Noncurrent assets: 69,241 68,800 68,533
U.S.      
Revenues From External Customers And Long Lived Assets [Line Items]      
Revenue 62,916 63,531 64,890
Noncurrent assets: 57,040 56,822 56,449
International:      
Revenues From External Customers And Long Lived Assets [Line Items]      
Revenue 25,010 24,162 25,265
Noncurrent assets: 12,201 11,978 12,084
Federal Express segment | International:      
Revenues From External Customers And Long Lived Assets [Line Items]      
Revenue 23,720 23,136 23,951
FedEx Freight
Segment | International:      
Revenues From External Customers And Long Lived Assets [Line Items]      
Revenue 247 266 264
Other | International:      
Revenues From External Customers And Long Lived Assets [Line Items]      
Revenue $ 1,043 $ 760 $ 1,050