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REVENUE RECOGNITION - Narrative (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Revenue From Contract With Customer [Line Items]
Expiration period for refundable tickets	1 year
Expiration period for advance ticket sales	12 months
Revenue	$ 57,063	$ 53,717	$ 44,955
Period over which miles are expected to be redeemed	two years
Minimum
Revenue From Contract With Customer [Line Items]
Term for frequent flyer mileage sales to partners	1 year
Maximum
Revenue From Contract With Customer [Line Items]
Term for frequent flyer mileage sales to partners	5 years
Advance Ticket Sales
Revenue From Contract With Customer [Line Items]
Revenue recognized	$ 5,300	5,700	3,300
Ancillary Fees Recorded within Passenger Revenues
Revenue From Contract With Customer [Line Items]
Revenue	4,500	4,100	3,400
Other operating revenue
Revenue From Contract With Customer [Line Items]
Revenue	3,491	3,176	2,752
Other operating revenue | Chase and Other Partner Agreements
Revenue From Contract With Customer [Line Items]
Revenue	$ 2,900	$ 2,700	$ 2,400

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