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Commitments and Contingencies - Narrative (Details) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2022 USD ($) employee technician option aircraft | Jul. 21, 2022 aircraft
Commitments and Contingencies [Line Items] |  |
Loss contingency, loss in period | $ 94,000,000 |
Aggregate balance | $ 1,115,000,000 |
Number of call options to purchase regional jet aircraft | option | 255 |
A321neo |  |
Commitments and Contingencies [Line Items] |  |
Number of aircrafts expected to take delivery that are delayed | aircraft |  | 8
Boeing 737 Max |  |
Commitments and Contingencies [Line Items] |  |
Number of aircrafts expected to take delivery that are delayed | aircraft | 37 |
B-737-Max |  |
Commitments and Contingencies [Line Items] |  |
Number of aircrafts expected to take delivery that are delayed | aircraft |  | 6
United Airlines, Inc. |  |
Commitments and Contingencies [Line Items] |  |
Number of employees | employee | 92,800 |
Percentage of employees represented by various U.S. labor organizations | 84.00% |
Labor negotiations, length of contract extension | 2 years |
Number of technicians | technician | 8,000 |
Bargaining on successor agreement, term | 1 year |
United Airlines, Inc. | Surety Bonds |  |
Commitments and Contingencies [Line Items] |  |
Contingent liabilities based on participation | $ 377,000,000 |
Tax-Exempt Special Facilities Revenue Bonds |  |
Commitments and Contingencies [Line Items] |  |
Guarantor obligations, maximum exposure | 2,000,000,000 |
Tax-Exempt Special Facilities Revenue Bonds | Indirect Guarantee of Indebtedness |  |
Commitments and Contingencies [Line Items] |  |
Guarantor obligations, maximum exposure | 400,000,000 |
Contingent liabilities based on participation | 2,500,000,000 |
Aircraft Mortgage Debt |  |
Commitments and Contingencies [Line Items] |  |
Guarantor obligations, maximum exposure | 92,000,000 |
Floating Rate Debt |  |
Commitments and Contingencies [Line Items] |  |
Aggregate principal amount | $ 12,900,000,000 |
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 | $ 9,800,000,000 |

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