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Commitments and Contingencies - Narrative (Details) $ in Millions | 9 Months Ended |  |
--- | --- | --- | ---
Sep. 30, 2022 USD ($) commitment employee aircraft | Dec. 31, 2022 aircraft | Jul. 21, 2022 aircraft
Commitments and Contingencies [Line Items] |  |  |
Loss contingency, loss in period | $ 94 |  |
Remaining term of debt | 10 years |  |
United Airlines, Inc. |  |  |
Commitments and Contingencies [Line Items] |  |  |
Number of employees | employee | 90,800 |  |
Percentage of employees represented by various U.S. labor organizations | 85.00% |  |
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 | 95 |  |
Floating Rate Debt |  |  |
Commitments and Contingencies [Line Items] |  |  |
Debt | $ 12,800 |  |
Loans and Leases from Non-U.S. Entities |  |  |
Commitments and Contingencies [Line Items] |  |  |
Remaining term of debt | 10 years |  |
Aggregate balance | $ 9,700 |  |
Boeing 787 |  |  |
Commitments and Contingencies [Line Items] |  |  |
Number of aircraft expected to take delivery that are delayed | aircraft | 3 |  |
Number of aircraft committed to purchase | commitment | 7 |  |
Boeing 737 MAX |  |  |
Commitments and Contingencies [Line Items] |  |  |
Number of aircraft expected to take delivery that are delayed | aircraft |  |  | 15
Sale leaseback transaction, number of leased assets expected to be purchased in next fiscal year | aircraft | 8 |  |
Number of aircraft committed to purchase | commitment | 353 |  |
Boeing 737 MAX | Forecast |  |  |
Commitments and Contingencies [Line Items] |  |  |
Number of aircraft expected to take delivery that are delayed | aircraft |  | 7 |
Bombardier CRJ550 |  |  |
Commitments and Contingencies [Line Items] |  |  |
Number of aircraft committed to purchase | commitment | 8 |  |

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