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Debt - Details of Pass Through Trusts (Details) - USD ($) | 3 Months Ended
--- | ---
Mar. 31, 2021 | Mar. 31, 2020
Debt Instrument [Line Items] |  |
Total proceeds received from issuance of debt | $ 1,336,000,000 | $ 2,813,000,000
United Airlines, Inc. |  |
Debt Instrument [Line Items] |  |
Total proceeds received from issuance of debt | 1,336,000,000 | $ 2,813,000,000
Pass-Through Certificates | Class A Pass-Through Certificates Issued February 2021 | United Airlines, Inc. |  |
Debt Instrument [Line Items] |  |
Face Amount | $ 600,000,000 |
Stated interest rate | 4.88% |
Total proceeds received from issuance of debt | $ 600,000,000 |
Total debt recorded | $ 600,000,000 |

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