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REVENUE RECOGNITION - Passenger Revenue (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Disaggregation of Revenue [Line Items]      
Total passenger revenue $ 61,643 $ 58,048 $ 50,582
Passenger      
Disaggregation of Revenue [Line Items]      
Total passenger revenue 50,894 48,909 40,218
Ticket      
Disaggregation of Revenue [Line Items]      
Total passenger revenue 45,096 43,596 35,626
Loyalty travel awards      
Disaggregation of Revenue [Line Items]      
Total passenger revenue 3,841 3,462 2,898
Travel-related services      
Disaggregation of Revenue [Line Items]      
Total passenger revenue $ 1,957 $ 1,851 $ 1,694