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Revenue Recognition - Revenue by Geographic Region (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Disaggregation of Revenue [Line Items]      
Operating revenue $ 61,643 $ 58,048 $ 50,582
Domestic      
Disaggregation of Revenue [Line Items]      
Operating revenue 43,508 40,845 38,478
Atlantic      
Disaggregation of Revenue [Line Items]      
Operating revenue 10,535 10,458 7,429
Latin America      
Disaggregation of Revenue [Line Items]      
Operating revenue 4,564 4,292 3,334
Pacific      
Disaggregation of Revenue [Line Items]      
Operating revenue 3,036 2,453 1,341
Passenger      
Disaggregation of Revenue [Line Items]      
Operating revenue 50,894 48,909 40,218
Passenger | Domestic      
Disaggregation of Revenue [Line Items]      
Operating revenue 35,226 33,968 30,197
Passenger | Atlantic      
Disaggregation of Revenue [Line Items]      
Operating revenue 9,133 9,057 6,093
Passenger | Latin America      
Disaggregation of Revenue [Line Items]      
Operating revenue 3,995 3,798 2,889
Passenger | Pacific      
Disaggregation of Revenue [Line Items]      
Operating revenue $ 2,540 $ 2,086 $ 1,039