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Details of Pass Through Trusts (Detail) - USD ($) $ in Millions | 9 Months Ended
--- | ---
Sep. 30, 2017 | Sep. 30, 2016
Debt Instrument [Line Items] |  |
Proceeds received from issuance of debt | $ 2,119 | $ 510
United Airlines, Inc. |  |
Debt Instrument [Line Items] |  |
Principal | 392 |
Proceeds received from issuance of debt | 2,119 | $ 510
United Airlines, Inc. | Class AA Pass Through Certificates | September 2016 |  |
Debt Instrument [Line Items] |  |
Principal | $ 637 |
Final expected distribution date | 2028-10 |
Stated interest rate | 2.875% |
Total debt recorded | $ 637 |
Proceeds received from issuance of debt | 557 |
United Airlines, Inc. | Class AA Pass Through Certificates | June 2016 |  |
Debt Instrument [Line Items] |  |
Principal | $ 729 |
Final expected distribution date | 2028-07 |
Stated interest rate | 3.10% |
Total debt recorded | $ 729 |
Proceeds received from issuance of debt | 319 |
United Airlines, Inc. | Class A Pass Through Certificates | September 2016 |  |
Debt Instrument [Line Items] |  |
Principal | $ 283 |
Final expected distribution date | 2028-10 |
Stated interest rate | 3.10% |
Total debt recorded | $ 283 |
Proceeds received from issuance of debt | 247 |
United Airlines, Inc. | Class A Pass Through Certificates | June 2016 |  |
Debt Instrument [Line Items] |  |
Principal | $ 324 |
Final expected distribution date | 2028-07 |
Stated interest rate | 3.45% |
Total debt recorded | $ 324 |
Proceeds received from issuance of debt | 142 |
United Airlines, Inc. | EETC |  |
Debt Instrument [Line Items] |  |
Principal | 1,973 |
Total debt recorded | 1,973 |
Proceeds received from issuance of debt | $ 1,265 |

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