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)	1.00%
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	$ 2,575	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)	4.00%
NYTDC Special Facilities Revenue Bonds \| Bonds \| Maximum
Debt Instrument [Line Items]
Interest rate per annum (percent)	6.00%
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)	2.00%
Financing secured by aircraft - Certificates \| Secured debt \| Maximum
Debt Instrument [Line Items]
Interest rate per annum (percent)	8.00%
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)	7.00%
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)	5.00%
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

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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