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Commitments and Contingencies - Narrative (Details) $ in Millions |  | 9 Months Ended
--- | --- | ---
Apr. 17, 2024 | Sep. 30, 2024 USD ($) employee aircraft
Commitments and Contingencies [Line Items] |  |
Leases not yet commenced |  | $ 4,000
Terms of leases not yet commenced |  | 12 years
United Airlines, Inc. |  |
Commitments and Contingencies [Line Items] |  |
Number of employees | employee |  | 106,500
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 |  | $ 1,800
Aircraft Mortgage Debt |  |
Commitments and Contingencies [Line Items] |  |
Aggregate principal amount of guarantee |  | 66
Floating Rate Debt |  |
Commitments and Contingencies [Line Items] |  |
Long-term debt |  | $ 8,500
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 |  | $ 5,400
A321neo |  |
Commitments and Contingencies [Line Items] |  |
Number of aircrafts with expected deliveries in 2026 and 2027 | aircraft |  | 40

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