DEBT - Summary of Debt (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2024	Dec. 31, 2023
Debt Instrument [Line Items]
Total secured and unsecured debt	$ 15,373	$ 18,693
Unamortized (discount)/premium and debt issuance cost, net and other	(26)	(83)
Total debt	15,347	18,610
Less: current maturities	(1,801)	(2,625)
Total long-term debt	$ 13,546	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)	1.00%
Total secured and unsecured debt	$ 3,496	3,496
Debt instrument term	5 years
Debt instrument, basis spread interest rate	2.00%
Unsecured notes \| Unsecured Debt
Debt Instrument [Line Items]
Maturity dates range, start	Dec. 31, 2025
Maturity dates range, end	Dec. 31, 2029
Total secured and unsecured debt	$ 1,575	2,590
Unsecured notes \| Unsecured Debt \| Minimum
Debt Instrument [Line Items]
Interest rate per annum (percent)	3.75%
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, 2025
Maturity dates range, end	Dec. 31, 2028
Total secured and unsecured debt	$ 3,970	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, 2025
Maturity dates range, end	Dec. 31, 2027
Interest rate per annum (percent)	8.37%
Total secured and unsecured debt	$ 784	1,772
NYTDC Special Facilities Revenue Bonds, Series \| Bonds
Debt Instrument [Line Items]
Maturity dates range, start	Dec. 31, 2025
Maturity dates range, end	Dec. 31, 2045
Total secured and unsecured debt	$ 3,591	3,656
NYTDC Special Facilities Revenue Bonds, Series \| Bonds \| Minimum
Debt Instrument [Line Items]
Interest rate per annum (percent)	4.00%
NYTDC Special Facilities Revenue Bonds, Series \| 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, 2025
Maturity dates range, end	Dec. 31, 2028
Total secured and unsecured debt	$ 992	1,591
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, 2025
Maturity dates range, end	Dec. 31, 2033
Total secured and unsecured debt	$ 87	165
Financings secured by aircraft - Notes \| Secured Debt \| Minimum
Debt Instrument [Line Items]
Interest rate per annum (percent)	6.62%
Financings secured by aircraft - Notes \| Secured Debt \| Maximum
Debt Instrument [Line Items]
Interest rate per annum (percent)	6.86%
Senior Secured Notes 2025 \| Secured Debt
Debt Instrument [Line Items]
Maturity date	Dec. 31, 2025
Interest rate per annum (percent)	7.00%
Total secured and unsecured debt	$ 812	838
Other financings \| Secured and unsecured Debt
Debt Instrument [Line Items]
Maturity dates range, start	Dec. 31, 2025
Maturity dates range, end	Dec. 31, 2030
Total secured and unsecured debt	$ 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)	5.00%
Corporate Revolving Credit Facility \| Revolving Credit Facility
Debt Instrument [Line Items]
Maturity dates range, start	Dec. 31, 2026
Maturity dates range, end	Dec. 31, 2028
Total secured and unsecured debt	$ 0	0
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
Total secured and unsecured debt	$ 0	$ 0

Percentage points added to the reference rate to compute the variable rate on the debt instrument.

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Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

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Contractual interest rate for funds borrowed, under the debt agreement.

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Latest date the outstanding debt instruments are required to be repaid, in YYYY-MM-DD format.

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Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Amount of unamortized debt discount (premium) and debt issuance costs.

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