v3.26.3
BUSINESS SEGMENTS AND DISAGGREGATED REVENUE - Schedule of Revenue by Service Type (Details) - USD ($)
$ in Millions
 1 Months Ended 3 Months Ended 4 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Sep. 30, 2026
Sep. 30, 2025
Sep. 30, 2026
Sep. 30, 2025
Entity Wide Information Revenue From External Customer [Line Items]            
Revenue $ 7,787 $ 6,462 $ 22,855 $ 20,432 $ 30,642 $ 26,894
Operating Segments | Express U.S. Domestic Segment            
Entity Wide Information Revenue From External Customer [Line Items]            
Revenue     14,710 13,392 19,748 17,596
Operating Segments | Express U.S. Domestic Segment | Total package revenue            
Entity Wide Information Revenue From External Customer [Line Items]            
Revenue     14,093 12,876 18,930 16,944
Operating Segments | Express U.S. Domestic Segment | U.S. priority            
Entity Wide Information Revenue From External Customer [Line Items]            
Revenue     3,142 2,826 4,199 3,710
Operating Segments | Express U.S. Domestic Segment | U.S. deferred            
Entity Wide Information Revenue From External Customer [Line Items]            
Revenue     1,406 1,302 1,887 1,708
Operating Segments | Express U.S. Domestic Segment | U.S. ground            
Entity Wide Information Revenue From External Customer [Line Items]            
Revenue     9,545 8,748 12,844 11,526
Operating Segments | Express U.S. Domestic Segment | U.S. Freight            
Entity Wide Information Revenue From External Customer [Line Items]            
Revenue     366 315 486 409
Operating Segments | Express U.S. Domestic Segment | Other            
Entity Wide Information Revenue From External Customer [Line Items]            
Revenue     251 201 332 243
Operating Segments | Express International Segment            
Entity Wide Information Revenue From External Customer [Line Items]            
Revenue     7,465 6,363 9,994 8,398
Operating Segments | Express International Segment | Total package revenue            
Entity Wide Information Revenue From External Customer [Line Items]            
Revenue     5,513 4,894 7,388 6,441
Operating Segments | Express International Segment | International priority            
Entity Wide Information Revenue From External Customer [Line Items]            
Revenue     2,677 2,325 3,595 3,049
Operating Segments | Express International Segment | International economy            
Entity Wide Information Revenue From External Customer [Line Items]            
Revenue     1,680 1,403 2,232 1,845
Operating Segments | Express International Segment | International domestic            
Entity Wide Information Revenue From External Customer [Line Items]            
Revenue     1,156 1,166 1,561 1,547
Operating Segments | Express International Segment | Total freight revenue            
Entity Wide Information Revenue From External Customer [Line Items]            
Revenue     1,442 1,126 1,921 1,505
Operating Segments | Express International Segment | International priority            
Entity Wide Information Revenue From External Customer [Line Items]            
Revenue     784 588 1,045 791
Operating Segments | Express International Segment | International economy            
Entity Wide Information Revenue From External Customer [Line Items]            
Revenue     658 538 876 714
Operating Segments | Express International Segment | Other            
Entity Wide Information Revenue From External Customer [Line Items]            
Revenue     510 343 685 452
Other and eliminations            
Entity Wide Information Revenue From External Customer [Line Items]            
Revenue     $ 680 $ 677 $ 900 $ 900