DEBT - Summary of Debt (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2022	Dec. 31, 2021
Debt Instrument [Line Items]
Debt, gross	$ 21,519	$ 25,292
Unamortized (discount)/premium and debt issuance cost, net and other	(138)	(208)
Total debt	21,381	25,084
Less: current maturities	(2,055)	(1,502)
Total long-term debt	$ 19,326	23,582
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, 2023
Maturity dates range, end	Dec. 31, 2029
Debt, gross	$ 2,997	4,354
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, 2023
Maturity dates range, end	Dec. 31, 2028
Interest rate per annum (percent)	4.50%
Debt, gross	$ 5,144	6,000
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, 2023
Maturity dates range, end	Dec. 31, 2027
Interest rate per annum (percent)	7.99%
Debt, gross	$ 2,820	2,820
Financings secured by aircraft - Certificates \| Secured Debt
Debt Instrument [Line Items]
Maturity dates range, start	Dec. 31, 2023
Maturity dates range, end	Dec. 31, 2028
Debt, gross	$ 1,802	1,932
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, 2023
Maturity dates range, end	Dec. 31, 2033
Debt, gross	$ 813	1,139
Financings secured by aircraft - Notes \| Secured Debt \| Minimum
Debt Instrument [Line Items]
Interest rate per annum (percent)	2.08%
Financings secured by aircraft - Notes \| Secured Debt \| Maximum
Debt Instrument [Line Items]
Interest rate per annum (percent)	6.85%
NYTDC Special Facilities Revenue Bonds, Series 2020 \| Bonds
Debt Instrument [Line Items]
Maturity dates range, start	Dec. 31, 2023
Maturity dates range, end	Dec. 31, 2045
Debt, gross	$ 2,838	2,894
NYTDC Special Facilities Revenue Bonds, Series 2020 \| Bonds \| Minimum
Debt Instrument [Line Items]
Interest rate per annum (percent)	4.00%
NYTDC Special Facilities Revenue Bonds, Series 2020 \| Bonds \| Maximum
Debt Instrument [Line Items]
Interest rate per annum (percent)	5.00%
2020 Senior Secured Notes \| Secured Debt
Debt Instrument [Line Items]
Interest rate per annum (percent)	7.00%
Debt, gross	$ 1,542	2,589
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, 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	Dec. 31, 2023
Maturity dates range, end	Dec. 31, 2030
Debt, gross	$ 67	68
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, 2023
Maturity dates range, end	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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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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