DEBT - Schedule of Debt (Details) - USD ($) $ in Millions	6 Months Ended
Jun. 30, 2026	Dec. 31, 2025
Debt Instrument [Line Items]
Total secured and unsecured debt	$ 12,893	$ 13,302
Unamortized (discount)/premium and debt issue cost, net and other	12	6
Total debt	12,905	13,308
Less: current maturities	(2,804)	(1,372)
Total long-term debt	$ 10,101	11,936
Unsecured Notes \| Unsecured debt
Debt Instrument [Line Items]
Maturity dates range, start	Dec. 31, 2028
Maturity dates range, end	Dec. 31, 2030
Total secured and unsecured debt	$ 2,884	2,884
Unsecured Notes \| Unsecured debt \| Minimum
Debt Instrument [Line Items]
Interest rate per annum	3.75%
Unsecured Notes \| Unsecured debt \| Maximum
Debt Instrument [Line Items]
Interest rate per annum	5.25%
Unsecured Payroll Support Program Loans \| Unsecured debt
Debt Instrument [Line Items]
Maturity date	Dec. 31, 2031
Interest rate per annum	5.62%
Total secured and unsecured debt	$ 891	1,848
SkyMiles Notes \| Secured debt
Debt Instrument [Line Items]
Maturity dates range, start	Dec. 31, 2026
Maturity dates range, end	Dec. 31, 2028
Interest rate per annum	4.75%
Total secured and unsecured debt	$ 2,852	3,422
SkyMiles Term Loan \| Secured debt
Debt Instrument [Line Items]
Maturity dates range, start	Dec. 31, 2026
Maturity dates range, end	Dec. 31, 2028
Interest rate per annum	4.93%
Total secured and unsecured debt	$ 585	588
NYTDC Special Facilities Revenue Bonds \| Bonds
Debt Instrument [Line Items]
Maturity dates range, start	Dec. 31, 2026
Maturity dates range, end	Dec. 31, 2045
Total secured and unsecured debt	$ 3,448	3,522
NYTDC Special Facilities Revenue Bonds \| Bonds \| Minimum
Debt Instrument [Line Items]
Interest rate per annum	4.00%
NYTDC Special Facilities Revenue Bonds \| Bonds \| Maximum
Debt Instrument [Line Items]
Interest rate per annum	6.00%
2026 Term Loan \| Secured debt
Debt Instrument [Line Items]
Maturity date	Dec. 31, 2026
Interest rate per annum	4.76%
Total secured and unsecured debt	$ 1,250	0
Financing secured by aircraft - Certificates \| Secured debt
Debt Instrument [Line Items]
Maturity dates range, start	Dec. 31, 2026
Maturity dates range, end	Dec. 31, 2028
Total secured and unsecured debt	$ 845	894
Financing secured by aircraft - Certificates \| Secured debt \| Minimum
Debt Instrument [Line Items]
Interest rate per annum	2.00%
Financing secured by aircraft - Certificates \| Secured debt \| Maximum
Debt Instrument [Line Items]
Interest rate per annum	8.00%
Financing secured by aircraft - Notes \| Secured debt
Debt Instrument [Line Items]
Maturity dates range, start	Dec. 31, 2026
Maturity dates range, end	Dec. 31, 2033
Total secured and unsecured debt	$ 72	78
Financing secured by aircraft - Notes \| Secured debt \| Minimum
Debt Instrument [Line Items]
Interest rate per annum	5.91%
Financing secured by aircraft - Notes \| Secured debt \| Maximum
Debt Instrument [Line Items]
Interest rate per annum	5.93%
Other financings \| Secured and unsecured debt
Debt Instrument [Line Items]
Maturity date	Dec. 31, 2030
Interest rate per annum	5.00%
Total secured and unsecured debt	$ 66	66
2026 Corporate Revolving Credit Facility \| Revolving credit facility
Debt Instrument [Line Items]
Maturity dates range, start	Dec. 31, 2029
Maturity dates range, end	Dec. 31, 2031
Total secured and unsecured debt	$ 0	0
Other revolving credit facilities \| Revolving credit facility
Debt Instrument [Line Items]
Maturity dates range, start	Dec. 31, 2026
Maturity dates range, end	Dec. 31, 2027
Total secured and unsecured debt	$ 0	$ 0

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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