DEBT - Summary of Debt (Details) - USD ($) $ in Millions	3 Months Ended
Mar. 31, 2023	Dec. 31, 2022
Debt Instrument [Line Items]
Debt, gross	$ 20,440	$ 21,519
Unamortized (discount)/premium and debt issue cost, net and other	(120)	(138)
Total debt	20,320	21,381
Less: current maturities	(1,830)	(2,055)
Total long-term debt	$ 18,490	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, 2023
Maturity dates range, end	Dec. 31, 2029
Debt, gross	$ 2,997	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	$ 5,007	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)	8.56%
Debt, gross	$ 2,478	2,820
NYTDC Special Facilities Revenue Bonds \| Bonds
Debt Instrument [Line Items]
Maturity dates range, start	Jan. 01, 2023
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	$ 1,790	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	$ 553	813
Financing secured by aircraft - Notes \| Secured debt \| Minimum
Debt Instrument [Line Items]
Interest rate per annum (percent)	6.11%
Financing secured by aircraft - Notes \| Secured debt \| Maximum
Debt Instrument [Line Items]
Interest rate per annum (percent)	7.22%
2020 Senior Secured Notes \| Secured debt
Debt Instrument [Line Items]
Maturity date	Dec. 31, 2025
Interest rate per annum (percent)	7.00%
Debt, gross	$ 1,274	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 \| Revolving credit facility
Debt Instrument [Line Items]
Maturity date	Dec. 31, 2025
Debt, gross	$ 0	$ 0
Other revolving credit facilities \| Secured and unsecured debt
Debt Instrument [Line Items]
Maturity dates range, start	Jan. 01, 2023

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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Date when the debt instrument is scheduled to be fully repaid, in YYYY-MM-DD format.

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

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

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

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Amount, excluding unamortized premium (discount) and debt issuance cost, of long-term debt. Excludes lease obligation.

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Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt, classified as current. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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Amount, excluding unamortized premium (discount) and debt issuance cost, of long-term debt classified as noncurrent. Excludes lease obligation.

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