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SEGMENTS - Segment Reporting (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Dec. 31, 2022
Segment Reporting Information, Profit (Loss)          
Operating revenue $ 15,578 $ 13,824 $ 28,337 $ 23,173  
Depreciation and amortization 573 510 1,137 1,016  
Operating income 2,491 1,519 2,215 735  
Interest expense, net 203 269 430 543  
Total assets, end of period 73,497 74,805 73,497 74,805 $ 72,288
Net fair value obligations, end of period   (556)   (556)  
Capital expenditures 1,452 958 2,452 2,724  
Operating Segments | Airline          
Segment Reporting Information, Profit (Loss)          
Operating revenue 14,613 12,310 26,455 20,473  
Depreciation and amortization 573 510 1,137 1,016  
Operating income 2,447 1,250 1,949 412  
Interest expense, net 203 269 430 543  
Total assets, end of period 70,265 71,766 70,265 71,766  
Net fair value obligations, end of period   0   0  
Capital expenditures 1,422 928 2,393 2,676  
Operating Segments | Refinery          
Segment Reporting Information, Profit (Loss)          
Operating revenue 2,037 3,353 4,388 5,666  
Depreciation and amortization 23 23 46 47  
Operating income 44 269 266 323  
Interest expense, net 3 2 8 4  
Total assets, end of period 3,309 3,065 3,309 3,065  
Net fair value obligations, end of period   (556)   (556)  
Capital expenditures 30 30 59 48  
Intersegment Sales/Other          
Segment Reporting Information, Profit (Loss)          
Depreciation and amortization (23) (23) (46) (47)  
Operating income 0 0 0 0  
Interest expense, net (3) (2) (8) (4)  
Total assets, end of period (77) (26) (77) (26)  
Net fair value obligations, end of period   0   0  
Capital expenditures 0 0 0 0  
Intersegment Sales/Other | Sales to airline segment          
Segment Reporting Information, Profit (Loss)          
Operating revenue (365) (761) (961) (1,053)  
Intersegment Sales/Other | Exchanged products          
Segment Reporting Information, Profit (Loss)          
Operating revenue (618) (982) (1,330) (1,791)  
Intersegment Sales/Other | Sales of refined products          
Segment Reporting Information, Profit (Loss)          
Operating revenue $ (89) $ (96) $ (215) $ (122)