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Commitments and Contingencies - Narrative (Details) employee in Thousands, $ in Millions |  | 6 Months Ended |  |
--- | --- | --- | --- | ---
Apr. 17, 2024 | Jun. 30, 2024 USD ($) employee aircraft | Jul. 31, 2024 aircraft | Jul. 18, 2024 USD ($)
Commitments and Contingencies [Line Items] |  |  |  |
Additional leases |  | $ 13,300 |  |
United Airlines, Inc. |  |  |  |
Commitments and Contingencies [Line Items] |  |  |  |
Number of employees | employee |  | 106 |  |
Percentage of employees represented by various U.S. labor organizations |  | 82.00% |  |
Proposed extension period for technician labor contracts | 4 years |  |  |
Tax-Exempt Special Facilities Revenue Bonds |  |  |  |
Commitments and Contingencies [Line Items] |  |  |  |
Aggregate principal amount of guarantee |  | $ 1,900 |  |
Aircraft Mortgage Debt |  |  |  |
Commitments and Contingencies [Line Items] |  |  |  |
Aggregate principal amount of guarantee |  | 70 |  |
Floating Rate Debt |  |  |  |
Commitments and Contingencies [Line Items] |  |  |  |
Long-term debt |  | $ 10,300 |  |
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 |  | $ 7,200 |  |
Subsequent Event |  |  |  |
Commitments and Contingencies [Line Items] |  |  |  |
Additional leases |  |  |  | $ 3,700
Lease terms of additional leases |  |  |  | 12 years
A321neo |  |  |  |
Commitments and Contingencies [Line Items] |  |  |  |
Number of aircrafts with expected deliveries in 2026 and 2027 | aircraft |  | 40 |  |
A321neo | Subsequent Event |  |  |  |
Commitments and Contingencies [Line Items] |  |  |  |
Number of aircraft entered into lease agreements | aircraft |  |  | 35 |

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