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DEBT - Summary of Debt (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2023 | Dec. 31, 2022
Debt Instrument [Line Items] |  |
Debt, gross | $ 18,693 | $ 21,519
Unamortized (discount)/premium and debt issuance cost, net and other | (83) | (138)
Total debt | 18,610 | 21,381
Less: current maturities | (2,625) | (2,055)
Total long-term debt | $ 15,985 | 19,326
Unsecured Payroll Support Program Loans | Unsecured Debt |  |
Debt Instrument [Line Items] |  |
Maturity dates range, start | Dec. 31, 2030 |
Maturity dates range, end | Dec. 31, 2031 |
Interest rate per annum (percent) | 1.00% |
Debt, gross | $ 3,496 | 3,496
Unsecured notes | Unsecured Debt |  |
Debt Instrument [Line Items] |  |
Maturity dates range, start | Dec. 31, 2024 |
Maturity dates range, end | Dec. 31, 2029 |
Debt, gross | $ 2,590 | 2,997
Unsecured notes | Unsecured Debt | Minimum |  |
Debt Instrument [Line Items] |  |
Interest rate per annum (percent) | 2.90% |
Unsecured notes | Unsecured Debt | Maximum |  |
Debt Instrument [Line Items] |  |
Interest rate per annum (percent) | 7.38% |
SkyMiles Notes | Secured Debt |  |
Debt Instrument [Line Items] |  |
Maturity dates range, start | Dec. 31, 2024 |
Maturity dates range, end | Dec. 31, 2028 |
Debt, gross | $ 4,518 | 5,144
SkyMiles Notes | Secured Debt | Minimum |  |
Debt Instrument [Line Items] |  |
Interest rate per annum (percent) | 4.50% |
SkyMiles Notes | Secured Debt | Maximum |  |
Debt Instrument [Line Items] |  |
Interest rate per annum (percent) | 4.75% |
SkyMiles Term Loan | Secured Debt |  |
Debt Instrument [Line Items] |  |
Maturity dates range, start | Dec. 31, 2024 |
Maturity dates range, end | Dec. 31, 2027 |
Interest rate per annum (percent) | 9.17% |
Debt, gross | $ 1,772 | 2,820
NYTDC Special Facilities Revenue Bonds, Series 2020 | Bonds |  |
Debt Instrument [Line Items] |  |
Maturity dates range, start | Dec. 31, 2024 |
Maturity dates range, end | Dec. 31, 2045 |
Debt, gross | $ 3,656 | 2,838
NYTDC Special Facilities Revenue Bonds, Series 2020 | Bonds | Minimum |  |
Debt Instrument [Line Items] |  |
Interest rate per annum (percent) | 4.00% |
NYTDC Special Facilities Revenue Bonds, Series 2020 | Bonds | Maximum |  |
Debt Instrument [Line Items] |  |
Interest rate per annum (percent) | 6.00% |
Financings secured by aircraft - Certificates | Secured Debt |  |
Debt Instrument [Line Items] |  |
Maturity dates range, start | Dec. 31, 2024 |
Maturity dates range, end | Dec. 31, 2028 |
Debt, gross | $ 1,591 | 1,802
Financings secured by aircraft - Certificates | Secured Debt | Minimum |  |
Debt Instrument [Line Items] |  |
Interest rate per annum (percent) | 2.00% |
Financings secured by aircraft - Certificates | Secured Debt | Maximum |  |
Debt Instrument [Line Items] |  |
Interest rate per annum (percent) | 8.00% |
Financings secured by aircraft - Notes | Secured Debt |  |
Debt Instrument [Line Items] |  |
Maturity dates range, start | Dec. 31, 2024 |
Maturity dates range, end | Dec. 31, 2033 |
Debt, gross | $ 165 | 813
Financings secured by aircraft - Notes | Secured Debt | Minimum |  |
Debt Instrument [Line Items] |  |
Interest rate per annum (percent) | 6.72% |
Financings secured by aircraft - Notes | Secured Debt | Maximum |  |
Debt Instrument [Line Items] |  |
Interest rate per annum (percent) | 7.65% |
2020 Senior Secured Notes | Secured Debt |  |
Debt Instrument [Line Items] |  |
Interest rate per annum (percent) | 7.00% |
Debt, gross | $ 838 | 1,542
2018 Revolving Credit Facility | Secured Debt |  |
Debt Instrument [Line Items] |  |
Maturity date | Dec. 31, 2025 |
2018 Revolving Credit Facility | Revolving Credit Facility |  |
Debt Instrument [Line Items] |  |
Maturity dates range, start | Dec. 31, 2026 |
Maturity dates range, end | Dec. 31, 2028 |
Debt, gross | $ 0 | 0
Other financings | Secured and unsecured Debt |  |
Debt Instrument [Line Items] |  |
Maturity dates range, start | Dec. 31, 2024 |
Maturity dates range, end | Dec. 31, 2030 |
Debt, gross | $ 67 | 67
Other financings | Secured and unsecured Debt | Minimum |  |
Debt Instrument [Line Items] |  |
Interest rate per annum (percent) | 2.51% |
Other financings | Secured and unsecured Debt | Maximum |  |
Debt Instrument [Line Items] |  |
Interest rate per annum (percent) | 5.00% |
Other revolving credit facilities | Revolving Credit Facility |  |
Debt Instrument [Line Items] |  |
Maturity dates range, start | Dec. 31, 2024 |
Maturity dates range, end | Dec. 31, 2026 |
Debt, gross | $ 0 | $ 0

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