Other Current Liabilities (Details) - USD ($) $ in Millions	Jun. 30, 2022	Dec. 31, 2021
Other Liabilities Disclosure [Abstract]
Passenger and other taxes and fees payable	$ 110	$ 84
Salaries, wages and benefits	93	89
Station obligations	58	64
Leased aircraft return costs	55	25
Fuel liabilities	53	23
Aircraft maintenance	45	36
Current portion of phantom equity units	0	26
Other current liabilities	47	36
Total other current liabilities	$ 461	$ 383