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REVENUE RECOGNITION - Passenger Revenue (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Disaggregation of Revenue [Line Items]
Passenger revenue	$ 15,488	$ 13,975	$ 43,825	$ 37,147
Passenger
Disaggregation of Revenue [Line Items]
Passenger revenue	13,119	11,464	36,735	29,329
Ticket
Disaggregation of Revenue [Line Items]
Passenger revenue	11,733	10,247	32,801	26,005
Loyalty travel awards
Disaggregation of Revenue [Line Items]
Passenger revenue	902	786	2,547	2,073
Travel-related services
Disaggregation of Revenue [Line Items]
Passenger revenue	$ 484	$ 431	$ 1,387	$ 1,251

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