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DEBT - Summary of Long-Term Debt (Details) - USD ($) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2024 | Dec. 31, 2023
Debt Instrument [Line Items] |  |
Long term debt | $ 24,837,000,000 | $ 29,352,000,000
Less: unamortized debt discount, premiums and debt issuance costs | (184,000,000) | (277,000,000)
Less: current portion of long-term debt | (2,973,000,000) | (4,018,000,000)
Long-term debt, net | 21,680,000,000 | 25,057,000,000
Secured Debt | Equipment Notes |  |
Debt Instrument [Line Items] |  |
Long term debt | $ 12,983,000,000 | 12,508,000,000
Secured Debt | Equipment Notes | Minimum |  |
Debt Instrument [Line Items] |  |
Fixed interest rate | 2.70% |
Basis spread on variable rate | 0.64% |
Secured Debt | Equipment Notes | Maximum |  |
Debt Instrument [Line Items] |  |
Fixed interest rate | 6.51% |
Basis spread on variable rate | 2.00% |
Secured Debt | MileagePlus Senior Secured Notes |  |
Debt Instrument [Line Items] |  |
Fixed interest rate | 6.50% |
Long term debt | $ 1,900,000,000 | 2,660,000,000
Secured Debt | MileagePlus Term Loan Facility |  |
Debt Instrument [Line Items] |  |
Long term debt | 0 | 2,100,000,000
Secured Debt | 2026 and 2029 Notes |  |
Debt Instrument [Line Items] |  |
Long term debt | $ 4,000,000,000 | 4,000,000,000
Secured Debt | 2026 and 2029 Notes | Minimum |  |
Debt Instrument [Line Items] |  |
Fixed interest rate | 4.38% |
Secured Debt | 2026 and 2029 Notes | Maximum |  |
Debt Instrument [Line Items] |  |
Fixed interest rate | 4.63% |
Secured Debt | 2021 Term Loans |  |
Debt Instrument [Line Items] |  |
Long term debt | $ 0 | 3,870,000,000
Basis spread on variable rate | 2.00% |
Secured Debt | 2024 Term Loans |  |
Debt Instrument [Line Items] |  |
Fixed interest rate | 6.63% |
Long term debt | $ 2,082,000,000 | 0
Unsecured | Notes |  |
Debt Instrument [Line Items] |  |
Fixed interest rate | 4.88% |
Long term debt | $ 315,000,000 | 596,000,000
Unsecured | PSP Notes |  |
Debt Instrument [Line Items] |  |
Fixed interest rate | 1.00% |
Long term debt | $ 3,181,000,000 | 3,181,000,000
Basis spread on variable rate | 2.00% |
Unsecured | PSP1 Note |  |
Debt Instrument [Line Items] |  |
Aggregate principal amount of debt | $ 1,500,000,000 |
Term of debt | 10 years |
Unsecured | PSP2 Note |  |
Debt Instrument [Line Items] |  |
Aggregate principal amount of debt | $ 900,000,000 |
Term of debt | 10 years |
Unsecured | PSP3 Note |  |
Debt Instrument [Line Items] |  |
Aggregate principal amount of debt | $ 800,000,000 |
Term of debt | 10 years |
Unsecured | Other unsecured debt |  |
Debt Instrument [Line Items] |  |
Long term debt | $ 376,000,000 | $ 437,000,000
Unsecured | Other unsecured debt | Minimum |  |
Debt Instrument [Line Items] |  |
Fixed interest rate | 4.00% |
Unsecured | Other unsecured debt | Maximum |  |
Debt Instrument [Line Items] |  |
Fixed interest rate | 5.75% |

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- Definition 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. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -SubTopic 10 -Topic 210 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 942 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478546/942-210-S99-1 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 470 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 4 -Subparagraph (b)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481139/470-20-50-4 + Details
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