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Commitments and Contingencies - Narrative (Details) technician in Thousands |  | 1 Months Ended | 4 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | ---
May 01, 2023 USD ($) | Sep. 30, 2023 | Dec. 31, 2023 USD ($) employee | Dec. 31, 2023 USD ($) employee option | Dec. 31, 2022 USD ($) | Dec. 31, 2021 USD ($) | May 31, 2023 contract employee | Jan. 31, 2023 technician
Commitments and Contingencies [Line Items] |  |  |  |  |  |  |  |
Gross capital expenditures |  |  |  | $ 7,171,000,000 | $ 4,819,000,000 | $ 2,107,000,000 |  |
Loss contingency, loss in period |  |  |  |  | 94,000,000 |  |  |
Aggregate balance |  |  | $ 3,243,000,000 | $ 3,243,000,000 |  |  |  |
Number of call options to purchase regional jet aircraft | option |  |  |  | 252 |  |  |  |
IAM National Pension Plan |  |  |  |  |  |  |  |
Commitments and Contingencies [Line Items] |  |  |  |  |  |  |  |
Number of employees | employee |  |  |  |  |  |  | 30,000 |
Number of contracts ratified | contract |  |  |  |  |  |  | 5 |
Payment for ratification of contracts and taxes | $ 48,000,000 |  |  |  |  |  |  |
Air Line Pilots Association |  |  |  |  |  |  |  |
Commitments and Contingencies [Line Items] |  |  |  |  |  |  |  |
Agreement in principle pay rate increase period |  | 4 years |  |  |  |  |  |
Expenses associated with AIP |  |  | $ 765,000,000 |  |  |  |  |
United Airlines, Inc. |  |  |  |  |  |  |  |
Commitments and Contingencies [Line Items] |  |  |  |  |  |  |  |
Gross capital expenditures |  |  |  | $ 7,171,000,000 | $ 4,819,000,000 | $ 2,107,000,000 |  |
Number of employees | employee |  |  | 103,300 | 103,300 |  |  |  |
Percentage of employees represented by various U.S. labor organizations |  |  |  | 83.00% |  |  |  |
Number of technicians | technician |  |  |  |  |  |  |  | 8
Surety Bonds | United Airlines, Inc. |  |  |  |  |  |  |  |
Commitments and Contingencies [Line Items] |  |  |  |  |  |  |  |
Contingent liabilities based on participation |  |  | $ 429,000,000 | $ 429,000,000 |  |  |  |
Tax-Exempt Special Facilities Revenue Bonds |  |  |  |  |  |  |  |
Commitments and Contingencies [Line Items] |  |  |  |  |  |  |  |
Underlying debt and interest |  |  | 1,900,000,000 | 1,900,000,000 |  |  |  |
Tax-Exempt Special Facilities Revenue Bonds | Indirect Guarantee of Indebtedness |  |  |  |  |  |  |  |
Commitments and Contingencies [Line Items] |  |  |  |  |  |  |  |
Underlying debt and interest |  |  | 447,000,000 | 447,000,000 |  |  |  |
Contingent liabilities based on participation |  |  | 2,500,000,000 | 2,500,000,000 |  |  |  |
Aircraft Mortgage Debt |  |  |  |  |  |  |  |
Commitments and Contingencies [Line Items] |  |  |  |  |  |  |  |
Underlying debt and interest |  |  | 77,000,000 | 77,000,000 |  |  |  |
Floating Rate Debt |  |  |  |  |  |  |  |
Commitments and Contingencies [Line Items] |  |  |  |  |  |  |  |
Long term debt |  |  | 11,300,000,000 | $ 11,300,000,000 |  |  |  |
Debt instrument, remaining terms |  |  |  | 12 years |  |  |  |
Loans And Leases From Non U S Entities |  |  |  |  |  |  |  |
Commitments and Contingencies [Line Items] |  |  |  |  |  |  |  |
Debt instrument, remaining terms |  |  |  | 12 years |  |  |  |
Aggregate balance |  |  | $ 8,100,000,000 | $ 8,100,000,000 |  |  |  |

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