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REVENUE RECOGNITION - Passenger Revenue (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Disaggregation of Revenue [Line Items]
Passenger revenue	$ 15,578	$ 13,824	$ 28,337	$ 23,173
Passenger
Disaggregation of Revenue [Line Items]
Passenger revenue	13,205	10,958	23,616	17,865
Ticket
Disaggregation of Revenue [Line Items]
Passenger revenue	11,829	9,773	21,068	15,759
Loyalty travel awards
Disaggregation of Revenue [Line Items]
Passenger revenue	902	744	1,645	1,287
Travel-related services
Disaggregation of Revenue [Line Items]
Passenger revenue	$ 474	$ 441	$ 903	$ 819

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