ACQUISITION OF HAWAIIAN HOLDINGS, INC. - Fair Values Of Assets Acquired And The Liabilities Assumed (Details) - USD ($) $ in Millions	Dec. 31, 2024	Sep. 30, 2024	Sep. 18, 2024	Dec. 31, 2023	Dec. 31, 2022
Total assets
Goodwill	$ 2,724			$ 1,943
Hawaiian Holdings, Inc.
Total assets
Cash and cash equivalents	286	$ 286
Restricted cash	27	27
Marketable securities	674	674
Receivables	110	110
Inventories and supplies	75	75
Prepaid expenses and other	77	77
Property and equipment	1,947	1,925
Operating lease assets	228	239
Intangible assets	799	799	$ 799
Goodwill	781	761		$ 1,900	$ 2,700
Other noncurrent assets	97	97
Total assets	5,101	5,070
Total liabilities
Accounts payable	57	57
Air traffic liability	513	513
Other accrued liabilities	331	331
Deferred revenue - current	229	229
Current portion of operating lease liabilities	65	65
Current portion of long-term debt and finance leases	144	144
Long-Term Debt, net of current portion	1,932	1,932
Long-term operating lease liabilities, net of current portion	234	235
Deferred income taxes	90	58
Deferred revenue - noncurrent	308	308
Obligations for pension and post-retirement medical benefits	153	153
Other liabilities	68	68
Total liabilities	4,124	4,093
Total purchase price	$ 977	$ 977