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SEGMENTS (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Dec. 31, 2024
Segment Reporting Information, Profit (Loss)      
Operating revenue $ 14,040 $ 13,748  
Airline salaries and related costs 4,083 3,791  
Aircraft fuel and related costs 2,410 2,598  
Depreciation and amortization 607 615  
Operating Income 569 614  
Interest expense, net 179 205  
Other non-operating expense 70 287  
Income Before Income Taxes 320 122  
Total assets, end of period 77,342 74,969 $ 75,372
Capital expenditures 1,224 1,193  
Operating Segments | Airline      
Segment Reporting Information, Profit (Loss)      
Operating revenue 12,978 12,563  
Airline salaries and related costs 4,083 3,791  
Aircraft fuel and related costs 2,410 2,598  
Depreciation and amortization 607 615  
Other segment items 5,308 4,994  
Operating Income 570 565  
Interest expense, net 179 205  
Other non-operating expense 70 287  
Income Before Income Taxes 321 73  
Total assets, end of period 75,043 72,875  
Capital expenditures 1,187 1,178  
Operating Segments | Refinery      
Segment Reporting Information, Profit (Loss)      
Operating revenue 1,698 2,049  
Refinery cost of goods sold 1,562 1,873  
Depreciation and amortization 28 27  
Other segment items 109 100  
Operating Income (1) 49  
Interest expense, net 1 5  
Income Before Income Taxes (2) 44  
Total assets, end of period 2,359 2,123  
Capital expenditures 37 15  
Intersegment Sales/Other      
Segment Reporting Information, Profit (Loss)      
Operating revenue (636) (864)  
Interest expense, net (1) (5)  
Income Before Income Taxes 1 5  
Total assets, end of period (60) (29)  
Capital expenditures  
Intersegment Sales/Other | Sales to airline segment      
Segment Reporting Information, Profit (Loss)      
Operating revenue (260) (386)  
Intersegment Sales/Other | Exchanged products      
Segment Reporting Information, Profit (Loss)      
Operating revenue (341) (439)  
Intersegment Sales/Other | Sales of refined products      
Segment Reporting Information, Profit (Loss)      
Operating revenue $ (35) $ (39)