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Debt - Details of Pass Through Trusts (Details) - USD ($) | 6 Months Ended
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Jun. 30, 2019 | Jun. 30, 2018
Debt Instrument [Line Items] |  |  |
Proceeds received from issuance of debt | $ 996,000,000 | $ 1,241,000,000 | [1]
United Airlines, Inc. |  |  |
Debt Instrument [Line Items] |  |  |
Proceeds received from issuance of debt | 996,000,000 | $ 1,241,000,000 | [2]
United Airlines, Inc. | Class AA Pass Through Certificates | February 2019 |  |  |
Debt Instrument [Line Items] |  |  |
Face Amount | $ 717,000,000 |  |
Stated interest rate | 4.15% |  |
Total debt recorded | $ 612,000,000 |  |
Proceeds received from issuance of debt | 612,000,000 |  |
Remaining proceeds from issuance of certificates to be received in future periods | 105,000,000 |  |
United Airlines, Inc. | Class A Pass Through Certificates | February 2019 |  |  |
Debt Instrument [Line Items] |  |  |
Face Amount | $ 296,000,000 |  |
Stated interest rate | 4.55% |  |
Total debt recorded | $ 253,000,000 |  |
Proceeds received from issuance of debt | 253,000,000 |  |
Remaining proceeds from issuance of certificates to be received in future periods | 43,000,000 |  |
United Airlines, Inc. | ETTC |  |  |
Debt Instrument [Line Items] |  |  |
Face Amount | 1,013,000,000 |  |
Total debt recorded | 865,000,000 |  |
Proceeds received from issuance of debt | 865,000,000 |  |
Remaining proceeds from issuance of certificates to be received in future periods | $ 148,000,000 |  |
[1] | Amounts adjusted due to the adoption of Accounting Standards Update No. 2016-02, Leases (Topic 842). See Note 1 to the financial statements contained in Part I, Item 1 of this report for additional information.
[2] | Amounts adjusted due to the adoption of Accounting Standards Update No. 2016-02, Leases (Topic 842). See Note 1 to the financial statements contained in Part I, Item 1 of this report for additional information.

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