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SEGMENTS (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Dec. 31, 2024
Segment Reporting Information, Profit (Loss)          
Operating revenue $ 16,648 $ 16,658 $ 30,688 $ 30,406  
Airline salaries and related costs 4,402 4,012 8,485 7,803  
Aircraft fuel and related costs 2,458 2,813 4,869 5,410  
Depreciation and amortization 602 620 1,209 1,235  
Operating Income 2,102 2,267 2,671 2,881  
Interest expense, net 172 188 350 394  
Income Before Income Taxes 2,574 1,773 2,895 1,895  
Total assets, end of period 78,395 75,197 78,395 75,197 $ 75,372
Capital expenditures 1,209 1,308 2,433 2,502  
Other Operating Income (Expense), Net 644 306 574 592  
Operating Segments | Airline          
Segment Reporting Information, Profit (Loss)          
Operating revenue 15,507 15,407 28,485 27,970  
Airline salaries and related costs 4,402 4,012 8,485 7,803  
Aircraft fuel and related costs 2,458 2,813 4,869 5,410  
Depreciation and amortization 602 620 1,209 1,235  
Other segment items 5,933 5,755 11,241 10,749  
Operating Income 2,112 2,207 2,681 2,773  
Interest expense, net 172 188 350 394  
Income Before Income Taxes 2,584 1,713 2,905 1,787  
Total assets, end of period 75,989 72,938 75,989 72,938  
Capital expenditures 1,200 1,292 2,387 2,472  
Other Operating Income (Expense), Net 644 306 574 592  
Operating Segments | Refinery          
Segment Reporting Information, Profit (Loss)          
Operating revenue 1,720 2,051 3,418 4,100  
Refinery cost of goods sold 1,598 1,868 3,160 3,741  
Depreciation and amortization 28 30 56 57  
Other segment items 104 93 212 194  
Operating Income (10) 60 (10) 108  
Interest expense, net 1 6 3 11  
Income Before Income Taxes (11) 54 (13) 97  
Total assets, end of period 2,420 2,337 2,420 2,337  
Capital expenditures 9 16 46 30  
Intersegment Sales/Other          
Segment Reporting Information, Profit (Loss)          
Operating revenue (579) (800) (1,215) (1,664)  
Interest expense, net (1) (6) (3) 11  
Income Before Income Taxes 1 6 3 11  
Total assets, end of period (14) (78) (14) (78)  
Intersegment Sales/Other | Sales to airline segment          
Segment Reporting Information, Profit (Loss)          
Operating revenue (332) (393) (592) (780)  
Intersegment Sales/Other | Exchanged products          
Segment Reporting Information, Profit (Loss)          
Operating revenue (186) (361) (527) (798)  
Intersegment Sales/Other | Sales of refined products          
Segment Reporting Information, Profit (Loss)          
Operating revenue $ (61) $ (46) $ (96) $ (86)