Revenue - Narrative (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Revenue From Contract With Customer [Line Items]
Total operating revenue	$ 11,429	$ 7,566
Advance Ticket Sales
Revenue From Contract With Customer [Line Items]
Revenue recognized	3,500	1,900
Ancillary Fees
Revenue From Contract With Customer [Line Items]
Total operating revenue	892	661
Other Operating Revenue
Revenue From Contract With Customer [Line Items]
Total operating revenue	757	591
Other Operating Revenue | Chase and Other Partner Agreements
Revenue From Contract With Customer [Line Items]
Total operating revenue	$ 646	$ 519