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Revenue - Narrative (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Revenue From Contract With Customer [Line Items]
Total operating revenue	$ 14,843	$ 14,484	$ 42,368	$ 40,091
Advance Ticket Sales
Revenue From Contract With Customer [Line Items]
Revenue recognized			5,200	5,300
Ancillary Fees
Revenue From Contract With Customer [Line Items]
Total operating revenue	1,100	1,100	3,300	3,000
Other Operating Revenue
Revenue From Contract With Customer [Line Items]
Total operating revenue	865	802	2,592	2,373
Other Operating Revenue | Chase and Other Partner Agreements
Revenue From Contract With Customer [Line Items]
Total operating revenue	$ 700	$ 700	$ 2,200	$ 2,000

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Amount of revenue recognized that was previously included in balance of obligation to transfer good or service to customer for which consideration from customer has been received or is due.

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