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REVENUE RECOGNITION - Narrative (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Revenue From Contract With Customer [Line Items]
Total operating revenue	$ 15,225	$ 14,843	$ 43,673	$ 42,368
Advance Ticket Sales
Revenue From Contract With Customer [Line Items]
Revenue recognized			5,800	5,200
Ancillary Services
Revenue From Contract With Customer [Line Items]
Total operating revenue	1,300	1,100	3,500	3,300
Other Operating Revenue
Revenue From Contract With Customer [Line Items]
Total operating revenue	979	865	2,872	2,592
Other Operating Revenue | Chase and Other Partner Agreements
Revenue From Contract With Customer [Line Items]
Total operating revenue	$ 800	$ 700	$ 2,400	$ 2,200

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