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Debt - Narrative (Details) - USD ($) | 1 Months Ended |
--- | --- | ---
May 31, 2019 | Feb. 28, 2019 | Sep. 30, 2019
United Airlines, Inc. | Pass-Through Certificates |  |  |
Debt Instrument [Line Items] |  |  |
Aggregate principal amount |  |  | $ 2,234,000,000
Revolving Credit Facility | United Airlines, Inc. | Secured Debt |  |  |
Debt Instrument [Line Items] |  |  |
Available under revolving credit facility |  |  | $ 2,000,000,000.0
2019-1 Pass Through Certificates | United Airlines, Inc. | Pass-Through Certificates |  |  |
Debt Instrument [Line Items] |  |  |
Proceeds from issuance of debt |  | $ 93,000,000 |
4.875% Senior Notes due 2025 | Senior Notes |  |  |
Debt Instrument [Line Items] |  |  |
Aggregate principal amount | $ 350,000,000 |  |
Interest rate | 4.875% |  |
Redemption price rate | 101.00% |  |

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