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Debt - Summary of Long-Term Debt (Details) - USD ($) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Apr. 21, 2021
Debt Instrument [Line Items] |  |  |
Long term debt | $ 29,352,000,000 | $ 31,580,000,000 |
Less: unamortized debt discount, premiums and debt issuance costs | (277,000,000) | (386,000,000) |
Less: current portion of long-term debt | (4,018,000,000) | (2,911,000,000) |
Long-term debt, net | $ 25,057,000,000 | 28,283,000,000 |
Secured Debt | Minimum |  |  |
Debt Instrument [Line Items] |  |  |
Fixed interest rate | 7.31% |  |
Secured Debt | Maximum |  |  |
Debt Instrument [Line Items] |  |  |
Fixed interest rate | 7.35% |  |
Secured Debt | Aircraft notes |  |  |
Debt Instrument [Line Items] |  |  |
Long term debt | $ 12,508,000,000 | 12,262,000,000 |
Secured Debt | Aircraft notes | Minimum |  |  |
Debt Instrument [Line Items] |  |  |
Fixed interest rate | 2.70% |  |
Secured Debt | Aircraft notes | Maximum |  |  |
Debt Instrument [Line Items] |  |  |
Fixed interest rate | 7.35% |  |
Secured Debt | Aircraft notes | SOFR | Minimum |  |  |
Debt Instrument [Line Items] |  |  |
Basis spread on variable rate | 0.49% |  |
Secured Debt | Aircraft notes | SOFR | Maximum |  |  |
Debt Instrument [Line Items] |  |  |
Basis spread on variable rate | 2.25% |  |
Secured Debt | MileagePlus Senior Secured Notes |  |  |
Debt Instrument [Line Items] |  |  |
Fixed interest rate | 6.50% |  |
Long term debt | $ 2,660,000,000 | 3,420,000,000 |
Secured Debt | MileagePlus Term Loan Facility |  |  |
Debt Instrument [Line Items] |  |  |
Fixed interest rate | 10.77% |  |
Long term debt | $ 2,100,000,000 | $ 2,700,000,000 |
Secured Debt | MileagePlus Term Loan Facility | SOFR | Maximum |  |  |
Debt Instrument [Line Items] |  |  |
Basis spread on variable rate | 5.25% | 5.25% |
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] |  |  |
Fixed interest rate | 9.22% |  |
Long term debt | $ 3,870,000,000 | $ 4,913,000,000 |
Aggregate principal amount |  |  | $ 5,000,000,000
Secured Debt | 2021 Term Loans | SOFR | Minimum |  |  |
Debt Instrument [Line Items] |  |  |
Basis spread on variable rate | 3.75% | 3.75% |
Unsecured |  |  |
Debt Instrument [Line Items] |  |  |
Fixed interest rate |  | 4.25% |
Unsecured | Notes |  |  |
Debt Instrument [Line Items] |  |  |
Long term debt | $ 596,000,000 | $ 596,000,000 |
Unsecured | Notes | Minimum |  |  |
Debt Instrument [Line Items] |  |  |
Fixed interest rate | 4.88% |  |
Unsecured | Notes | Maximum |  |  |
Debt Instrument [Line Items] |  |  |
Fixed interest rate | 5.00% |  |
Unsecured | Other unsecured debt |  |  |
Debt Instrument [Line Items] |  |  |
Long term debt | $ 437,000,000 | 508,000,000 |
Unsecured | Other unsecured debt | Minimum |  |  |
Debt Instrument [Line Items] |  |  |
Fixed interest rate | 0.00% |  |
Unsecured | Other unsecured debt | Maximum |  |  |
Debt Instrument [Line Items] |  |  |
Fixed interest rate | 5.75% |  |
Unsecured | PSP Notes |  |  |
Debt Instrument [Line Items] |  |  |
Fixed interest rate | 1.00% |  |
Long term debt | $ 3,181,000,000 | $ 3,181,000,000 |
Unsecured | PSP Notes | SOFR |  |  |
Debt Instrument [Line Items] |  |  |
Basis spread on variable rate | 2.00% |  |
Unsecured | PSP1 Note |  |  |
Debt Instrument [Line Items] |  |  |
Term of debt | 10 years |  |
Aggregate principal amount | $ 1,500,000,000 |  |
Unsecured | PSP2 Note |  |  |
Debt Instrument [Line Items] |  |  |
Term of debt | 10 years |  |
Aggregate principal amount | $ 900,000,000 |  |
Unsecured | PSP3 Note |  |  |
Debt Instrument [Line Items] |  |  |
Term of debt | 10 years |  |
Aggregate principal amount | $ 800,000,000 |  |

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