INCOME TAXES - Types of Temporary Differences and Carry-Forwards that Significantly Effect Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
Deferred Tax Assets
Employee benefits	$ 265	$ 243
Net operating loss carry-forwards	1,132	1,096
Accrued expenses and other reserves	219	181
Tax credits	64	55
Loyalty Program	277	168
Deferred income	102	66
Lease liabilities	266	304
Interest limitation	67	187
Other	40	12
Deferred tax assets	2,432	2,312
Valuation allowance	(1,149)	(1,359)
Deferred tax assets after valuation allowance	1,283	953
Deferred Tax Liabilities
Property and equipment	(62)	(58)
Intangibles	(471)	(626)
Right-of-use assets	(248)	(265)
Self-insurance	(22)	(37)
Other	(16)	(40)
Deferred tax liabilities	(819)	(1,026)
Net deferred taxes	$ 464
Net deferred taxes		$ (73)