COMMITMENTS AND CONTINGENCIES - Narrative (Details) - USD ($) $ in Millions	1 Months Ended	3 Months Ended
Mar. 31, 2023	Mar. 31, 2023	Jan. 31, 2023
Commitments and Contingencies Disclosure [Abstract]
Future aircraft purchase commitments	$ 18,700	$ 18,700
Collective bargaining agreement term	4 years
Pilot pay rate increase			18.00%
Pilot agreement expense		735
Adjustments to other benefit-related items		$ 130

Amount of the unrecorded obligation to transfer funds in the future for fixed or minimum amounts or quantities of goods or services at fixed or minimum prices (for example, as in take-or-pay contracts or throughput contracts).

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 440
-SubTopic 10
-Section 50
-Paragraph 4
-Subparagraph (b)
-URI https://asc.fasb.org/extlink&oid=123406679&loc=d3e25336-109308

Name:	us-gaap_UnrecordedUnconditionalPurchaseObligationBalanceSheetAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant