DEBT - Schedule of Debt (Details) - USD ($) $ in Millions	6 Months Ended
Jun. 30, 2025	Dec. 31, 2024
Debt Instrument [Line Items]
Total secured and unsecured debt	$ 14,386	$ 15,373
Unamortized (discount)/premium and debt issue cost, net and other	(5)	(26)
Total debt	14,381	15,347
Less: current maturities	(1,981)	(1,801)
Total long-term debt	$ 12,400	13,546
Unsecured Notes \| Unsecured debt
Debt Instrument [Line Items]
Maturity dates range, start	Dec. 31, 2024
Maturity dates range, end	Dec. 31, 2029
Total secured and unsecured debt	$ 3,575	1,575
Unsecured Notes \| Unsecured debt \| Minimum
Debt Instrument [Line Items]
Interest rate per annum (percent)	3.75%
Unsecured Notes \| Unsecured debt \| Maximum
Debt Instrument [Line Items]
Interest rate per annum (percent)	7.38%
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%
Total secured and unsecured debt	$ 1,848	3,496
Debt instrument term	5 years
Margin on rate (percent)	2.00%
Unsecured Payroll Support Program Loans \| Unsecured debt \| Minimum
Debt Instrument [Line Items]
Interest rate per annum (percent)	1.00%
SkyMiles Notes \| Secured debt
Debt Instrument [Line Items]
Maturity dates range, start	Dec. 31, 2024
Maturity dates range, end	Dec. 31, 2028
Total secured and unsecured debt	$ 3,696	3,970
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)	8.02%
Total secured and unsecured debt	$ 654	784
NYTDC Special Facilities Revenue Bonds \| Bonds
Debt Instrument [Line Items]
Maturity dates range, start	Dec. 31, 2025
Maturity dates range, end	Dec. 31, 2045
Total secured and unsecured debt	$ 3,522	3,591
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
Total secured and unsecured debt	$ 943	992
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
Total secured and unsecured debt	$ 82	87
Financing secured by aircraft - Notes \| Secured debt \| Minimum
Debt Instrument [Line Items]
Interest rate per annum (percent)	6.53%
Financing secured by aircraft - Notes \| Secured debt \| Maximum
Debt Instrument [Line Items]
Interest rate per annum (percent)	6.58%
Senior Secured Notes \| Secured debt
Debt Instrument [Line Items]
Maturity date	Dec. 31, 2025
Interest rate per annum (percent)	0.00%
Total secured and unsecured debt	$ 0	812
Other financings \| Secured and unsecured debt
Debt Instrument [Line Items]
Maturity dates range, start	Dec. 31, 2024
Maturity dates range, end	Dec. 31, 2030
Total secured and unsecured debt	$ 66	66
Other financings \| Secured and unsecured debt \| Minimum
Debt Instrument [Line Items]
Interest rate per annum (percent)	5.00%
Corporate Revolving Credit Facility \| Revolving credit facility
Debt Instrument [Line Items]
Maturity dates range, start	Dec. 31, 2026
Maturity dates range, end	Dec. 31, 2028
Total secured and unsecured debt	$ 0	0
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
Total secured and unsecured debt	$ 0	$ 0

Percentage points added to the reference rate to compute the variable rate on the debt instrument.

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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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Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 210
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(22))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1

+ Details

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Period Type:	instant

- Details

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- Details

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- Details

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- Details

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- Details

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- Details

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- Details

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- Details

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- Details

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- Details

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- Details

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- Details

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- Details

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- Details

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- Details

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- Details

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- Details

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- Details

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