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Commitments and Contingencies - Narrative (Details) technician in Thousands, $ in Millions |  | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
May 01, 2023 USD ($) Contract employee | Jun. 30, 2023 USD ($) employee technician | Jun. 30, 2022 USD ($) | Jun. 30, 2023 USD ($) employee technician | Jun. 30, 2022 USD ($) | Dec. 31, 2022 USD ($)
Commitments and Contingencies [Line Items] |  |  |  |  |  |
Labor contract ratification bonuses |  | $ 813 | $ 0 | $ 813 | $ 0 |
International Association Of Machinists 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 |  |  |  |  |
Air Line Pilots Association |  |  |  |  |  |
Commitments and Contingencies [Line Items] |  |  |  |  |  |
Labor contract ratification bonuses |  |  |  |  |  | $ 765
United Airlines, Inc. |  |  |  |  |  |
Commitments and Contingencies [Line Items] |  |  |  |  |  |
Number of employees | employee |  | 99,800 |  | 99,800 |  |
Percentage of employees represented by various U.S. labor organizations |  |  |  | 83.00% |  |
Number of technicians | technician |  | 8 |  | 8 |  |
Bargaining on successor agreement, term |  |  |  | 1 year |  |
Tax-Exempt Special Facilities Revenue Bonds |  |  |  |  |  |
Commitments and Contingencies [Line Items] |  |  |  |  |  |
Aggregate principal amount of guarantee |  | $ 2,000 |  | $ 2,000 |  |
Aircraft Mortgage Debt |  |  |  |  |  |
Commitments and Contingencies [Line Items] |  |  |  |  |  |
Aggregate principal amount of guarantee |  | 84 |  | 84 |  |
Floating Rate Debt |  |  |  |  |  |
Commitments and Contingencies [Line Items] |  |  |  |  |  |
Long-term debt |  | 11,600 |  | $ 11,600 |  |
Remaining term of debt |  |  |  | 12 years |  |
Loans and Leases from Non-U.S. Entities |  |  |  |  |  |
Commitments and Contingencies [Line Items] |  |  |  |  |  |
Remaining term of debt |  |  |  | 12 years |  |
Aggregate balance |  | $ 8,500 |  | $ 8,500 |  |

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