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Commitments and Contingencies - Narrative (Details) $ in Millions | 3 Months Ended |
--- | --- | ---
Mar. 31, 2024 USD ($) employee | Apr. 17, 2024 aircraft
United Airlines, Inc. |  |
Commitments and Contingencies [Line Items] |  |
Number of employees | employee | 104,500 |
Percentage of employees represented by various U.S. labor organizations | 83.00% |
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 | 73 |
Floating Rate Debt |  |
Commitments and Contingencies [Line Items] |  |
Long-term debt | $ 10,100 |
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 | $ 6,900 |
Subsequent Event | A321neo |  |
Commitments and Contingencies [Line Items] |  |
Number of aircrafts with expected deliveries in 2026 and 2027 | aircraft |  | 35

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