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BUSINESS SEGMENTS AND DISAGGREGATED REVENUE - Schedule of Segment Information (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Feb. 28, 2026
Feb. 28, 2025
Feb. 28, 2026
Feb. 28, 2025
May 31, 2025
Segment Reporting Information [Line Items]          
Revenue $ 24,000 $ 22,160 $ 69,713 $ 65,706  
Salaries and employee benefits 8,819 7,879 25,276 23,543  
Purchased transportation 6,084 5,634 17,457 16,409  
Rentals and landing fees 1,235 1,178 3,638 3,507  
Depreciation and amortization 1,112 1,066 3,272 3,207  
Fuel 856 889 2,618 2,911  
Maintenance and repairs 771 783 2,503 2,443  
Separation and other costs 202 5 460 5  
Business optimization costs 65 179 162 633  
Other 3,508 3,255 10,415 9,624  
Total operating expenses 22,652 20,868 65,801 62,282  
Other operating income (loss) 1,348 1,292 3,912 3,424  
Interest, net (138) (116) (392) (302)  
Other retirement plans, net 59 50 178 149  
Other, net (6) (45) (12) (53)  
Total other (expense) income (85) (111) (226) (206)  
INCOME BEFORE INCOME TAXES 1,263 1,181 3,686 3,218  
FedEx Freight spin-off costs 195 23 443 23  
Segment assets 94,733   94,733   $ 87,627
Capital expenditures     2,335 2,582  
Other, net          
Segment Reporting Information [Line Items]          
FedEx Freight spin-off costs 1 18 3 18  
Operating Segments | Total Federal Express and FedEx Freight revenue          
Segment Reporting Information [Line Items]          
Revenue 23,145 21,270 67,090 62,922  
Other operating income (loss) 1,580 1,555 4,719 4,311  
Operating Segments | Federal Express segment          
Segment Reporting Information [Line Items]          
Revenue 21,154 19,181 60,703 56,327  
Salaries and employee benefits 7,231 6,390 20,571 18,920  
Purchased transportation 5,665 5,196 16,218 15,064  
Rentals and landing fees 1,057 1,002 3,098 2,975  
Depreciation and amortization 971 926 2,856 2,779  
Fuel 751 777 2,290 2,566  
Maintenance and repairs 670 672 2,180 2,106  
Separation and other costs 37 0 60 0  
Business optimization costs 67 92 95 341  
Intercompany allocations (206) (199) (668) (591)  
Other 3,339 3,031 9,742 8,868  
Total operating expenses 19,582 17,887 56,442 53,028  
Other operating income (loss) 1,572 1,294 4,261 3,299  
Segment assets 74,570   74,570   74,154
Capital expenditures     1,990 2,145  
Operating Segments | FedEx Freight segment          
Segment Reporting Information [Line Items]          
Revenue 1,991 2,089 6,387 6,595  
Salaries and employee benefits 977 939 2,935 2,899  
Purchased transportation 193 202 591 602  
Rentals and landing fees 74 72 224 215  
Depreciation and amortization 112 113 335 335  
Fuel 104 112 327 344  
Maintenance and repairs 73 85 243 255  
Separation and other costs 126 0 287 0  
Intercompany allocations 134 142 449 433  
Other 190 163 538 500  
Total operating expenses 1,983 1,828 5,929 5,583  
Other operating income (loss) 8 261 458 1,012  
Segment assets 17,425   17,425   12,899
Capital expenditures     284 359  
Corporate, Other, and Eliminations          
Segment Reporting Information [Line Items]          
Revenue 855 890 2,623 2,784  
Other operating income (loss) (232) $ (263) (807) (887)  
Segment assets $ 2,738   2,738   $ 574
Capital expenditures     $ 61 $ 78