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REVENUE - Passenger Revenue Breakout (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Disaggregation of Revenue      
Total operating revenues $ 15,790 $ 9,048 $ 22,428
Passenger      
Disaggregation of Revenue      
Total operating revenues 14,066 7,665 20,776
Passenger non-loyalty      
Disaggregation of Revenue      
Total operating revenues 11,377 6,303 17,578
Passenger loyalty - air transportation      
Disaggregation of Revenue      
Total operating revenues 2,136 1,003 2,487
Passenger ancillary sold separately      
Disaggregation of Revenue      
Total operating revenues $ 553 $ 359 $ 711