DEBT - Schedule of Debt (Details) - USD ($) $ in Millions | 6 Months Ended | |
Jun. 30, 2024 | Dec. 31, 2023 |
Debt Instrument [Line Items] | | |
Debt, gross | $ 16,832 | $ 18,693 |
Unamortized (discount)/premium and debt issue cost, net and other | (49) | (83) |
Total debt | 16,783 | 18,610 |
Less: current maturities | (2,699) | (2,625) |
Total long-term debt | $ 14,084 | 15,985 |
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% | |
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 | $ 2,575 | 2,590 |
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 | $ 4,244 | 4,518 |
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) | 9.07% | |
Debt, gross | $ 915 | 1,772 |
NYTDC Special Facilities Revenue Bonds | Bonds | | |
Debt Instrument [Line Items] | | |
Maturity dates range, start | Dec. 31, 2025 | |
Maturity dates range, end | Dec. 31, 2045 | |
Debt, gross | $ 3,591 | 3,656 |
NYTDC Special Facilities Revenue Bonds | Bonds | Minimum | | |
Debt Instrument [Line Items] | | |
Interest rate per annum (percent) | 4% | |
NYTDC Special Facilities Revenue Bonds | Bonds | Maximum | | |
Debt Instrument [Line Items] | | |
Interest rate per annum (percent) | 6% | |
Financing 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 | $ 1,041 | 1,591 |
Financing secured by aircraft - Certificates | Secured debt | Minimum | | |
Debt Instrument [Line Items] | | |
Interest rate per annum (percent) | 2% | |
Financing secured by aircraft - Certificates | Secured debt | Maximum | | |
Debt Instrument [Line Items] | | |
Interest rate per annum (percent) | 8% | |
Financing 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 | $ 92 | 165 |
Financing secured by aircraft - Notes | Secured debt | Minimum | | |
Debt Instrument [Line Items] | | |
Interest rate per annum (percent) | 7.58% | |
Financing secured by aircraft - Notes | Secured debt | Maximum | | |
Debt Instrument [Line Items] | | |
Interest rate per annum (percent) | 7.60% | |
2020 Senior Secured Notes | Secured debt | | |
Debt Instrument [Line Items] | | |
Interest rate per annum (percent) | 7% | |
Debt, gross | $ 812 | 838 |
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 | $ 66 | 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% | |
Other revolving credit facilities | Revolving credit facility | | |
Debt Instrument [Line Items] | | |
Maturity dates range, start | Dec. 31, 2025 | |
Maturity dates range, end | Dec. 31, 2026 | |
Debt, gross | $ 0 | $ 0 |