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Commitments and Contingencies - Narrative (Details) technician in Thousands, $ in Millions | 3 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2023 USD ($) employee aircraft technician | Jun. 30, 2023 aircraft | Apr. 30, 2023 employee
Commitments and Contingencies [Line Items] |  |  |
Remaining term of debt | 12 years |  |
International Association Of Machinists National Pension Plan | Subsequent Event |  |  |
Commitments and Contingencies [Line Items] |  |  |
Number of employees | employee |  |  | 30,000
United Airlines, Inc. |  |  |
Commitments and Contingencies [Line Items] |  |  |
Number of employees | employee | 96,300 |  |
Percentage of employees represented by various U.S. labor organizations | 84.00% |  |
Number of technicians | technician | 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 |  |
Aircraft Mortgage Debt |  |  |
Commitments and Contingencies [Line Items] |  |  |
Aggregate principal amount of guarantee | $ | 88 |  |
Floating Rate Debt |  |  |
Commitments and Contingencies [Line Items] |  |  |
Debt | $ | $ 12,900 |  |
Loans and Leases from Non-U.S. Entities |  |  |
Commitments and Contingencies [Line Items] |  |  |
Remaining term of debt | 12 years |  |
Aggregate balance | $ | $ 9,700 |  |
A321neo |  |  |
Commitments and Contingencies [Line Items] |  |  |
Number of aircraft expected to take delivery that are delayed, current year | 8 |  |
Number of additional aircrafts expected to take delivery that are delayed, next fiscal year | 10 |  |
737 MAX |  |  |
Commitments and Contingencies [Line Items] |  |  |
Number of aircraft expected to take delivery that are delayed | 11 |  |
Number of aircraft expected to take delivery that are delayed, current year | 37 |  |
Number of additional aircrafts expected to take delivery that are delayed, next fiscal year | 30 |  |
737 MAX | Forecast |  |  |
Commitments and Contingencies [Line Items] |  |  |
Number of aircraft expected to take delivery that are delayed, current year |  | 6 |

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