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LONG-TERM DEBT - SCHEDULE OF LONG-TERM DEBT (Details) - USD ($) $ / shares in Units, $ in Millions | 12 Months Ended | 21 Months Ended
--- | --- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2021
Debt Instrument [Line Items] |  |  |  |
Long-term Debt | $ 2,471 | $ 2,159 |  |
Less debt issuance costs | (15) | (15) |  |
Less current portion | 289 | 276 |  |
Long-term debt, net of current portion | $ 2,182 | $ 1,883 |  |
Weighted-average fixed-interest rate | 3.40% | 3.50% |  |
Weighted-average variable-interest rate | 6.80% | 5.80% |  |
Proceeds from issuance of long-term debt, net of issuance costs | $ 411 | $ 0 | $ 363 |
Long-term debt payments | 282 | 385 | 1,334 |
Long-term Debt, Fiscal Year Maturity [Abstract] |  |  |  |
2024 | 294 |  |  |
2025 | 351 |  |  |
2026 | 307 |  |  |
2027 | 630 |  |  |
2028 | 114 |  |  |
Thereafter | 790 |  |  |
Long-term Debt | 2,486 |  |  |
Proceeds from Issuance of Long-term Debt | 595 |  |  |
Unsecured Term Loan through PSP of CARES Act | $ 600 | 600 |  |
Adjustments to Additional Paid in Capital, Warrant Issued |  |  | 16 |
Long-term Debt, Weighted Average Interest Rate, at Point in Time | 4.40% |  |  |
Proceeds from Issuance of Long-term Debt | $ 595 |  |  |
Adjustments to Additional Paid in Capital, Warrant Issued |  |  | $ 16 |
Class of Warrant or Right, Exercise Price of Warrants or Rights | $ 39.06 |  |  |
Scheduled debt payments [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term debt payments | $ 282 |  |  |
Fixed-rate notes payable due through 2029 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term Debt | 80 | 113 |  |
Variable-rate notes payable due through 2035 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term Debt | 971 | 514 |  |
Fixed-rate EETC payable due through 2027 [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term Debt | 835 | $ 947 |  |
US Treasury CARES Act Loan |  |  |  |
Long-term Debt, Fiscal Year Maturity [Abstract] |  |  |  |
Adjustments to Additional Paid in Capital, Warrant Issued |  |  |  | $ 30
Adjustments to Additional Paid in Capital, Warrant Issued |  |  |  | $ 30
Proceeds from Issuance of Long-Term Debt, Noncash proceeds |  |  |  |
Long-term Debt, Fiscal Year Maturity [Abstract] |  |  |  |
Proceeds from Issuance of Long-term Debt | 179 |  |  |
Proceeds from Issuance of Long-term Debt | 179 |  |  |
Proceeds from Issuance of Long-Term Debt, Cash proceeds |  |  |  |
Long-term Debt, Fiscal Year Maturity [Abstract] |  |  |  |
Proceeds from Issuance of Long-term Debt | 416 |  |  |
Proceeds from Issuance of Long-term Debt | $ 416 |  |  |

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- Definition The cash inflow during the period from additional borrowings in aggregate debt. Includes proceeds from short-term and long-term debt. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 230 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 14 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482740/230-10-45-14 + Details
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