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SEGMENT AND GEOGRAPHIC INFORMATION - Segment Information (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Segment Reporting Information [Line Items] |  |  |
Revenue | $ 91,070 | $ 90,958 | $ 100,338
Compensation and benefits | 48,093 | 47,092 | 47,724
Purchased transportation | 13,589 | 13,640 | 17,666
Segment Operating profit/(loss) | 7,536 | 8,387 | 11,477
Other pension income (expense) | (396) | (95) | 2,251
Investment income (expense) and other | 236 | 314 | 184
Interest expense | (866) | (787) | (704)
Income Before Income Taxes | 7,442 | 8,573 | 14,825
Long-lived assets | 70,070 | 70,857 | 71,124
Depreciation and amortization | 3,609 | 3,366 | 3,188
Domestic Segment |  |  |
Segment Reporting Information [Line Items] |  |  |
Compensation | 20,839 | 19,818 | 20,488
Benefits | 16,862 | 16,859 | 16,603
Purchased transportation | 2,466 | 2,555 | 3,333
Other segment items | 15,864 | 15,817 | 17,036
Segment Operating profit/(loss) | 4,345 | 5,156 | 7,151
International Segment |  |  |
Segment Reporting Information [Line Items] |  |  |
Compensation and benefits | 3,783 | 3,794 | 3,890
Purchased transportation | 3,447 | 3,391 | 3,773
Other segment items | 7,539 | 7,415 | 7,709
Segment Operating profit/(loss) | 3,191 | 3,231 | 4,326
Operating Segments |  |  |
Segment Reporting Information [Line Items] |  |  |
Revenue | 78,336 | 78,036 | 84,309
Long-lived assets | 56,957 | 55,955 | 55,973
Depreciation and amortization | 3,247 | 3,032 | 2,934
Operating Segments | Domestic Segment |  |  |
Segment Reporting Information [Line Items] |  |  |
Revenue | 60,376 | 60,205 | 64,611
Long-lived assets | 38,657 | 38,368 | 38,303
Depreciation and amortization | 2,470 | 2,290 | 2,173
Operating Segments | International Segment |  |  |
Segment Reporting Information [Line Items] |  |  |
Revenue | 17,960 | 17,831 | 19,698
Long-lived assets | 18,300 | 17,587 | 17,670
Depreciation and amortization | 777 | 742 | 761
Other items |  |  |
Segment Reporting Information [Line Items] |  |  |
Revenue | 12,734 | 12,922 | 16,029
Other profit/(loss) | 932 | 754 | 1,617
Long-lived assets | 9,850 | 11,245 | 10,407
Depreciation and amortization | 362 | 334 | 254
Unallocated items |  |  |
Segment Reporting Information [Line Items] |  |  |
Long-lived assets | $ 3,263 | $ 3,657 | $ 4,744

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