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SEGMENTS (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Dec. 31, 2023
Segment Reporting Information, Profit (Loss)          
Operating revenue $ 16,658 $ 15,578 $ 30,406 $ 28,337  
Depreciation and amortization 620 573 1,235 1,137  
Operating income 2,267 2,491 2,881 2,215  
Interest expense, net 188 203 394 430  
Total assets, end of period 75,197 73,497 75,197 73,497 $ 73,644
Capital expenditures 1,308 1,452 2,502 2,452  
Operating Segments | Airline          
Segment Reporting Information, Profit (Loss)          
Operating revenue 15,407 14,613 27,970 26,455  
Depreciation and amortization 620 573 1,235 1,137  
Operating income 2,207 2,447 2,773 1,949  
Interest expense, net 188 203 394 430  
Total assets, end of period 72,938 70,265 72,938 70,265  
Capital expenditures 1,292 1,422 2,472 2,393  
Operating Segments | Refinery          
Segment Reporting Information, Profit (Loss)          
Operating revenue 2,051 2,037 4,100 4,388  
Depreciation and amortization 30 23 57 46  
Operating income 60 44 108 266  
Interest expense, net 6 3 11 8  
Total assets, end of period 2,337 3,309 2,337 3,309  
Capital expenditures 16 30 30 59  
Intersegment Sales/Other          
Segment Reporting Information, Profit (Loss)          
Operating revenue (800) (1,072) (1,664) (2,506)  
Depreciation and amortization (30) (23) (57) (46)  
Operating income 0 0 0 0  
Interest expense, net (6) (3) (11) (8)  
Total assets, end of period (78) (77) (78) (77)  
Capital expenditures 0 0 0 0  
Intersegment Sales/Other | Sales to airline segment          
Segment Reporting Information, Profit (Loss)          
Operating revenue (393) (365) (780) (961)  
Intersegment Sales/Other | Exchanged products          
Segment Reporting Information, Profit (Loss)          
Operating revenue (361) (618) (798) (1,330)  
Intersegment Sales/Other | Sales of refined products          
Segment Reporting Information, Profit (Loss)          
Operating revenue $ (46) $ (89) $ (86) $ (215)