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Revenue Recognition - Revenue by Geographic Region (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Disaggregation of Revenue [Line Items]      
Operating revenue $ 50,582 $ 29,899 $ 17,095
Domestic      
Disaggregation of Revenue [Line Items]      
Operating revenue 38,478 24,320 13,339
Atlantic      
Disaggregation of Revenue [Line Items]      
Operating revenue 7,429 2,537 1,649
Latin America      
Disaggregation of Revenue [Line Items]      
Operating revenue 3,334 2,284 1,321
Pacific      
Disaggregation of Revenue [Line Items]      
Operating revenue 1,341 758 786
Passenger      
Disaggregation of Revenue [Line Items]      
Operating revenue 40,218 22,519 12,883
Passenger | Domestic      
Disaggregation of Revenue [Line Items]      
Operating revenue 30,197 18,468 10,041
Passenger | Atlantic      
Disaggregation of Revenue [Line Items]      
Operating revenue 6,093 1,777 1,171
Passenger | Latin America      
Disaggregation of Revenue [Line Items]      
Operating revenue 2,889 1,873 1,113
Passenger | Pacific      
Disaggregation of Revenue [Line Items]      
Operating revenue $ 1,039 $ 401 $ 558