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SEGMENTS - Segment Reporting (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Segment Reporting Information, Profit (Loss) |  |  |
Operating revenue | $ 58,048 | $ 50,582 | $ 29,899
Depreciation and amortization | 2,341 | 2,107 | 1,998
Operating income (loss) | 5,521 | 3,661 | 1,886
Interest expense, net | 834 | 1,029 | 1,279
Total assets, end of period | 73,644 | 72,288 | 72,459
Capital expenditures | 5,323 | 6,366 | 3,247
Operating Segments | Airline |  |  |
Segment Reporting Information, Profit (Loss) |  |  |
Operating revenue | 54,669 | 45,605 | 26,670
Depreciation and amortization | 2,341 | 2,107 | 1,998
Operating income (loss) | 5,136 | 2,884 | 1,888
Interest expense, net | 834 | 1,029 | 1,279
Total assets, end of period | 71,529 | 69,355 | 70,417
Capital expenditures | 5,088 | 6,217 | 3,188
Operating Segments | Refinery |  |  |
Segment Reporting Information, Profit (Loss) |  |  |
Operating revenue | 7,572 | 10,706 | 6,054
Depreciation and amortization | 94 | 93 | 95
Operating income (loss) | 385 | 777 | (2)
Interest expense, net | 17 | 12 | 7
Total assets, end of period | 2,174 | 3,039 | 2,099
Capital expenditures | 235 | 149 | 59
Intersegment Sales/Other |  |  |
Segment Reporting Information, Profit (Loss) |  |  |
Operating revenue | (4,193) | (5,729) | (2,825)
Depreciation and amortization | (94) | (93) | (95)
Interest expense, net | (17) | (12) | (7)
Total assets, end of period | (59) | (106) | (57)
Intersegment Sales/Other | Sales to airline segment |  |  |
Segment Reporting Information, Profit (Loss) |  |  |
Operating revenue | (1,535) | (1,976) | (492)
Intersegment Sales/Other | Exchanged products |  |  |
Segment Reporting Information, Profit (Loss) |  |  |
Operating revenue | (2,354) | (3,475) | (2,293)
Intersegment Sales/Other | Sales of refined products |  |  |
Segment Reporting Information, Profit (Loss) |  |  |
Operating revenue | $ (304) | $ (278) | $ (40)

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