Income Taxes - Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
Deferred tax assets:
Operating lease liability	$ 669	$ 568
Net operating losses	75	50
Nondeductible accruals	30	42
Deferred revenue	16	14
Income tax credits	2	1
Valuation allowance	48	8
Other	13	10
Deferred tax assets	757	677
Deferred tax liabilities:
Right-of-use asset	(658)	(559)
Property and equipment	(55)	(41)
Maintenance deposits	(19)	(24)
Intangibles	(6)	(6)
Other	(27)	(14)
Deferred tax liabilities	(765)	(644)
Net deferred tax assets (liabilities)	$ (8)
Deferred tax assets		$ 33