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Special Items (Details) - USD ($) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2023 | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Unusual or Infrequent Items, or Both [Abstract] |  |  |  |
Union contract costs | $ 8,000,000 | $ 105,000,000 | $ 33,000,000 | $ 8,000,000
Spirit costs |  | 92,000,000 | 28,000,000 | 0
Embraer E190 fleet transition |  | 0 | 52,000,000 | 0
Federal payroll support grant recognition |  | 0 | 0 | (830,000,000)
CARES Act employee retention credit |  | 0 | 0 | (11,000,000)
Total |  | $ 197,000,000 | $ 113,000,000 | $ (833,000,000)

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- Definition Special items during period + References No definition available. + Details
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- Definition Special Items, CARES Act Employee Retention Credit + References No definition available. + Details
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- Definition Special Items, CARES Act Payroll Support + References No definition available. + Details
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- Definition Special items relating to the EMBRAER E190 fleet transition. + References No definition available. + Details
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- Definition Special Items relating to the ratification of pilots union. + References No definition available. + Details
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- Definition Amount of expense (income) related to the increase (decrease) in reserve for business combination costs. Includes, but is not limited to, legal, accounting, and other costs incurred to consummate the merger. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 45 -Paragraph 28 -Subparagraph (b) -SubTopic 10 -Topic 230 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482740/230-10-45-28 + Details
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