Revenue - Narrative (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Revenue From Contract With Customer [Line Items]
Operating revenue	$ 12,112	$ 5,471	$ 19,678	$ 8,692
Advance Ticket Sales
Revenue From Contract With Customer [Line Items]
Revenue recognized	4,200	1,500	2,600	1,400
Ancillary Fees
Revenue From Contract With Customer [Line Items]
Operating revenue	900	500	1,500	800
Other Operating Revenue
Revenue From Contract With Customer [Line Items]
Operating revenue	709	499	1,300	907
Other Operating Revenue | Chase and Other Partner Agreements
Revenue From Contract With Customer [Line Items]
Operating revenue	$ 600	$ 400	$ 1,100	$ 800