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Commitments and Contingencies - Narrative (Details) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2022 USD ($) employee aircraft | Jun. 30, 2022 USD ($) employee aircraft | Jul. 21, 2022 aircraft
Commitments and Contingencies [Line Items] |  |  |
Loss contingency, loss in period | $ 94 | $ 94 |
Remaining term of debt |  | 10 years |
Boeing 737 MAX |  |  |
Commitments and Contingencies [Line Items] |  |  |
Sale leaseback transaction, number of leased assets expected to be purchased in next fiscal year | aircraft | 8 | 8 |
Boeing 737 MAX | Subsequent Event |  |  |
Commitments and Contingencies [Line Items] |  |  |
Number of aircraft expected to take delivery that are delayed | aircraft |  |  | 7
Boeing 787 | Subsequent Event |  |  |
Commitments and Contingencies [Line Items] |  |  |
Number of aircraft expected to take delivery that are delayed | aircraft |  |  | 3
United Airlines, Inc. |  |  |
Commitments and Contingencies [Line Items] |  |  |
Number of employees | employee | 91,200 | 91,200 |
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 | $ 2,000 |
Aircraft Mortgage Debt |  |  |
Commitments and Contingencies [Line Items] |  |  |
Aggregate principal amount of guarantee | 99 | 99 |
Floating Rate Debt |  |  |
Commitments and Contingencies [Line Items] |  |  |
Debt | 13,100 | $ 13,100 |
Loans and Leases from Non-U.S. Entities |  |  |
Commitments and Contingencies [Line Items] |  |  |
Remaining term of debt |  | 10 years |
Aggregate balance | $ 9,900 | $ 9,900 |

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