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SEGMENTS - Segment Reporting (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Dec. 31, 2022
Segment Reporting Information, Profit (Loss)      
Operating revenue $ 12,759 $ 9,348  
Operating income (loss) (277) (783)  
Interest expense, net 227 274  
Depreciation and amortization 564 506  
Total assets, end of period 73,134 73,748 $ 72,288
Net fair value obligations, end of period (38) (430)  
Capital expenditures 1,000 1,766  
Operating Segments | Airline      
Segment Reporting Information, Profit (Loss)      
Operating revenue 11,843 8,161  
Operating income (loss) (499) (836)  
Interest expense, net 227 274  
Depreciation and amortization 564 506  
Total assets, end of period 70,183 71,392  
Net fair value obligations, end of period 0 0  
Capital expenditures 971 1,749  
Operating Segments | Refinery      
Segment Reporting Information, Profit (Loss)      
Operating revenue 2,352 2,313  
Operating income (loss) 222 53  
Interest expense, net 4 2  
Depreciation and amortization 23 23  
Total assets, end of period 3,005 2,382  
Net fair value obligations, end of period (38) (430)  
Capital expenditures 29 17  
Intersegment Sales/Other      
Segment Reporting Information, Profit (Loss)      
Operating income (loss) 0 0  
Interest expense, net (4) (2)  
Depreciation and amortization (23) (23)  
Total assets, end of period (54) (26)  
Net fair value obligations, end of period 0 0  
Capital expenditures 0 0  
Intersegment Sales/Other | Sales to airline segment      
Segment Reporting Information, Profit (Loss)      
Operating revenue (596) (291)  
Intersegment Sales/Other | Exchanged products      
Segment Reporting Information, Profit (Loss)      
Operating revenue (714) (809)  
Intersegment Sales/Other | Sales of refined products      
Segment Reporting Information, Profit (Loss)      
Operating revenue $ (126) $ (26)