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DEBT - Summary of Debt (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Dec. 31, 2023
Debt Instrument [Line Items]
Debt, gross	$ 18,196	$ 18,693
Unamortized (discount)/premium and debt issue cost, net and other	(69)	(83)
Total debt	18,127	18,610
Less: current maturities	(2,551)	(2,625)
Total long-term debt	$ 15,576	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	$ 4,381	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	$ 1,598	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	$ 1,582	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	$ 94	165
Financing secured by aircraft - Notes | Secured debt | Minimum
Debt Instrument [Line Items]
Interest rate per annum (percent)	4.00%
Financing secured by aircraft - Notes | Secured debt | Maximum
Debt Instrument [Line Items]
Interest rate per annum (percent)	7.59%
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	$ 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 dates range, start	Dec. 31, 2024
Maturity dates range, end	Dec. 31, 2026
Debt, gross	$ 0	$ 0

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