GENERAL AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - PASSENGER TICKET AND ANCILLARY SERVICES REVENUE (Details) - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023
Accounting Policies [Abstract]
Credit Card Receivables	$ 444	$ 243

Amounts receivable from issuing a card to individuals or businesses that allows someone to make a purchase on borrowed money.

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 210
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(3)(a)(4))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1

Name:	us-gaap_CreditCardReceivables
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant