Income Taxes - Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Deferred tax assets:
Operating lease liability	$ 551	$ 514
Net operating losses	47	9
Nondeductible accruals	32	25
Deferred revenue	12	12
Income tax credits	2	0
Valuation allowance	(8)	0	$ 0
Other	10	11
Deferred tax assets	646	571
Deferred tax liabilities:
Right of use asset	(545)	(507)
Property and equipment	(36)	(34)
Maintenance deposits	(22)	(19)
Intangibles	(6)	(7)
Leasehold interests	0	(6)
Other	(12)	(7)
Deferred tax liabilities	(621)	(580)
Net deferred tax assets (liabilities)		$ (9)
Deferred tax assets	$ 25