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Details of Pass Through Trusts (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Debt Instrument [Line Items] |  |  |
Total debt recorded |  |  | $ 248
Proceeds received from issuance of debt | $ 808 | $ 1,073 | 1,432
United Airlines, Inc. |  |  |
Debt Instrument [Line Items] |  |  |
Principal | 369 |  |
Proceeds received from issuance of debt | 808 | $ 1,073 | $ 1,432
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 | $ 80 |  |
Proceeds received from issuance of debt | 80 |  |
Remaining proceeds from issuance of debt to be received in future periods | 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 | $ 410 |  |
Proceeds received from issuance of debt | 410 |  |
Remaining proceeds from issuance of debt to be received in future periods | 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 | $ 36 |  |
Proceeds received from issuance of debt | 36 |  |
Remaining proceeds from issuance of debt to be received in future periods | 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 | $ 182 |  |
Proceeds received from issuance of debt | 182 |  |
Remaining proceeds from issuance of debt to be received in future periods | 142 |  |
United Airlines, Inc. | EETC |  |  |
Debt Instrument [Line Items] |  |  |
Principal | 1,973 |  |
Total debt recorded | 708 |  |
Proceeds received from issuance of debt | 708 |  |
Remaining proceeds from issuance of debt to be received in future periods | $ 1,265 |  |

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