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SEGMENTS - Segment Reporting (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Segment Reporting Information, Profit (Loss)      
Operating revenue $ 61,643 $ 58,048 $ 50,582
Airline salaries and related costs 16,161 14,607 11,902
Aircraft fuel and related costs 10,566 11,069 11,482
Depreciation and amortization 2,513 2,341 2,107
Operating income 5,995 5,521 3,661
Interest expense, net 747 834 1,029
Income before income taxes 4,658 5,608 1,914
Total assets, end of period 75,372 73,644 72,288
Capital expenditures 5,140 5,323 6,366
Operating Segments | Airline      
Segment Reporting Information, Profit (Loss)      
Operating revenue 57,001 54,669 45,605
Airline salaries and related costs 16,161 14,607 11,902
Aircraft fuel and related costs 10,566 11,069 11,482
Depreciation and amortization 2,513 2,341 2,107
Other segment items 21,804 21,516 17,230
Operating income 5,957 5,136 2,884
Interest expense, net 747 834 1,029
Other non-operating expense 590 921 718
Income before income taxes 4,620 5,223 1,137
Total assets, end of period 72,979 71,529 69,355
Capital expenditures 5,075 5,088 6,217
Operating Segments | Refinery      
Segment Reporting Information, Profit (Loss)      
Operating revenue 7,767 7,572 10,706
Refinery cost of goods sold 7,234 6,665 9,442
Depreciation and amortization 113 94 93
Other segment items 382 428 394
Operating income 38 385 777
Interest expense, net 3 17 12
Income before income taxes 35 368 765
Total assets, end of period 2,418 2,174 3,039
Capital expenditures 65 235 149
Intersegment Sales/Other      
Segment Reporting Information, Profit (Loss)      
Operating revenue (3,125) (4,193) (5,729)
Interest expense, net (3) (17) (12)
Income before income taxes 3 17 12
Total assets, end of period (25) (59) (106)
Intersegment Sales/Other | Sales to airline segment      
Segment Reporting Information, Profit (Loss)      
Operating revenue (1,421) (1,535) (1,976)
Intersegment Sales/Other | Exchanged products      
Segment Reporting Information, Profit (Loss)      
Operating revenue (1,473) (2,354) (3,475)
Intersegment Sales/Other | Sales of refined products      
Segment Reporting Information, Profit (Loss)      
Operating revenue $ (231) $ (304) $ (278)