Revenue - Narrative (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Revenue From Contract With Customer [Line Items]
Operating revenue	$ 7,566	$ 3,221
Advance Ticket Sales
Revenue From Contract With Customer [Line Items]
Revenue recognized	1,900	700
Ancillary Fees
Revenue From Contract With Customer [Line Items]
Operating revenue	661	308
Other Operating Revenue
Revenue From Contract With Customer [Line Items]
Operating revenue	591	408
Other Operating Revenue | Chase and Other Partner Agreements
Revenue From Contract With Customer [Line Items]
Operating revenue	$ 519	$ 362