v3.26.1
BUSINESS SEGMENTS AND DISAGGREGATED REVENUE - Schedule of Revenue by Service Type (Details) - USD ($)
$ in Millions
 12 Months Ended
May 31, 2026
May 31, 2025
May 31, 2024
Entity Wide Information Revenue From External Customer [Line Items]      
Revenue $ 94,720 $ 87,926 $ 87,693
Operating Segments | Federal Express segment      
Entity Wide Information Revenue From External Customer [Line Items]      
Revenue 82,273 75,304 74,663
Operating Segments | Federal Express segment | Total package revenue      
Entity Wide Information Revenue From External Customer [Line Items]      
Revenue 74,927 68,507 67,216
Operating Segments | Federal Express segment | Total U.S. domestic package revenue      
Entity Wide Information Revenue From External Customer [Line Items]      
Revenue 54,638 49,414 48,450
Operating Segments | Federal Express segment | U.S. priority revenue      
Entity Wide Information Revenue From External Customer [Line Items]      
Revenue 11,603 10,520 10,543
Operating Segments | Federal Express segment | U.S. deferred revenue      
Entity Wide Information Revenue From External Customer [Line Items]      
Revenue 5,700 5,007 4,926
Operating Segments | Federal Express segment | U.S. ground revenue      
Entity Wide Information Revenue From External Customer [Line Items]      
Revenue 37,335 33,887 32,981
Operating Segments | Federal Express segment | Total international export package revenue      
Entity Wide Information Revenue From External Customer [Line Items]      
Revenue 15,564 14,598 14,107
Operating Segments | Federal Express segment | International priority      
Entity Wide Information Revenue From External Customer [Line Items]      
Revenue 9,639 8,737 9,454
Operating Segments | Federal Express segment | International economy      
Entity Wide Information Revenue From External Customer [Line Items]      
Revenue 5,925 5,861 4,653
Operating Segments | Federal Express segment | International domestic      
Entity Wide Information Revenue From External Customer [Line Items]      
Revenue 4,725 4,495 4,659
Operating Segments | Federal Express segment | Total freight revenue      
Entity Wide Information Revenue From External Customer [Line Items]      
Revenue 6,056 5,831 6,470
Operating Segments | Federal Express segment | U.S.      
Entity Wide Information Revenue From External Customer [Line Items]      
Revenue 1,252 1,536 2,391
Operating Segments | Federal Express segment | International priority      
Entity Wide Information Revenue From External Customer [Line Items]      
Revenue 2,560 2,320 2,205
Operating Segments | Federal Express segment | International economy      
Entity Wide Information Revenue From External Customer [Line Items]      
Revenue 2,244 1,975 1,874
Operating Segments | Federal Express segment | Other      
Entity Wide Information Revenue From External Customer [Line Items]      
Revenue 1,290 966 977
Operating Segments | FedEx Freight
Segment      
Entity Wide Information Revenue From External Customer [Line Items]      
Revenue 8,795 8,892 9,429
Other and eliminations      
Entity Wide Information Revenue From External Customer [Line Items]      
Revenue $ 3,652 $ 3,730 $ 3,601