DEBT - Summary of Debt (Details) - USD ($) $ in Millions	9 Months Ended
Sep. 30, 2023	Dec. 31, 2022
Debt Instrument [Line Items]
Debt, gross	$ 18,111	$ 21,519
Unamortized (discount)/premium and debt issue cost, net and other	(83)	(138)
Total debt	18,028	21,381
Less: current maturities	(1,681)	(2,055)
Total long-term debt	$ 16,347	19,326
Unsecured Payroll Support Program Loans \| Unsecured debt
Debt Instrument [Line Items]
Maturity dates range, start	Jan. 01, 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	Jan. 01, 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	Jan. 01, 2023
Maturity dates range, end	Dec. 31, 2028
Debt, gross	$ 4,655	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	Jan. 01, 2023
Maturity dates range, end	Dec. 31, 2027
Interest rate per annum (percent)	9.08%
Debt, gross	$ 1,882	2,820
NYTDC Special Facilities Revenue Bonds \| Bonds
Debt Instrument [Line Items]
Maturity dates range, start	Jan. 01, 2024
Maturity dates range, end	Dec. 31, 2045
Debt, gross	$ 2,778	2,838
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)	5.00%
Financing secured by aircraft - Certificates \| Secured debt
Debt Instrument [Line Items]
Maturity dates range, start	Jan. 01, 2023
Maturity dates range, end	Dec. 31, 2028
Debt, gross	$ 1,632	1,802
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	Jan. 01, 2023
Maturity dates range, end	Dec. 31, 2033
Debt, gross	$ 173	813
Financing secured by aircraft - Notes \| Secured debt \| Minimum
Debt Instrument [Line Items]
Interest rate per annum (percent)	6.76%
Financing secured by aircraft - Notes \| Secured debt \| Maximum
Debt Instrument [Line Items]
Interest rate per annum (percent)	8.00%
2020 Senior Secured Notes \| Secured debt
Debt Instrument [Line Items]
Maturity date	Dec. 31, 2025
Interest rate per annum (percent)	7.00%
Debt, gross	$ 838	1,542
2018 Revolving Credit Facility \| Revolving credit facility
Debt Instrument [Line Items]
Maturity dates range, start	Jan. 01, 2024
Maturity dates range, end	Dec. 31, 2025
Debt, gross	$ 0	0
Other financings \| Secured and unsecured debt
Debt Instrument [Line Items]
Maturity dates range, start	Jan. 01, 2023
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 \| Bonds
Debt Instrument [Line Items]
Maturity dates range, start	Jan. 01, 2024
Other revolving credit facilities \| Revolving credit facility
Debt Instrument [Line Items]
Maturity date	Dec. 31, 2025
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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