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Commitments and Contingencies - Additional Information (Detail) | 1 Months Ended | 9 Months Ended
--- | --- | ---
Oct. 17, 2016 | Sep. 30, 2016 USD ($) Employee Aircraft | Aug. 31, 2016 | Mar. 31, 2016 Contract | Jan. 31, 2016 | Sep. 30, 2016 USD ($) Employee Aircraft Contract
Aircraft Mortgage Debt |  |  |  |  |  |
Commitments and Contingencies [Line Items] |  |  |  |  |  |
Guarantor obligations, maximum exposure |  | $ 171,000,000 |  |  |  | $ 171,000,000
Floating Rate Debt |  |  |  |  |  |
Commitments and Contingencies [Line Items] |  |  |  |  |  |
Debt instrument principal amount |  | 2,500,000,000 |  |  |  | 2,500,000,000
Fixed Rate Debt |  |  |  |  |  |
Commitments and Contingencies [Line Items] |  |  |  |  |  |
Debt instrument principal amount |  | 97,000,000 |  |  |  | 97,000,000
Loans And Leases From Non U S Entities |  |  |  |  |  |
Commitments and Contingencies [Line Items] |  |  |  |  |  |
Debt instrument principal amount |  | 2,600,000,000 |  |  |  | 2,600,000,000
Tax-exempt special facilities revenue bonds |  |  |  |  |  |
Commitments and Contingencies [Line Items] |  |  |  |  |  |
Guarantor obligations, maximum exposure |  | 1,900,000,000 |  |  |  | 1,900,000,000
Operating leases obligations |  | 1,400,000,000 |  |  |  | 1,400,000,000
Capital leases obligations |  | $ 376,000,000 |  |  |  | $ 376,000,000
Minimum | Tax-exempt special facilities revenue bonds |  |  |  |  |  |
Commitments and Contingencies [Line Items] |  |  |  |  |  |
Debt instrument maturity year |  |  |  |  |  | 2017
Maximum |  |  |  |  |  |
Commitments and Contingencies [Line Items] |  |  |  |  |  |
Debt instrument, remaining terms (years) |  |  |  |  |  | 12 years
Maximum | Loans And Leases From Non U S Entities |  |  |  |  |  |
Commitments and Contingencies [Line Items] |  |  |  |  |  |
Debt instrument, remaining terms (years) |  |  |  |  |  | 12 years
Maximum | Tax-exempt special facilities revenue bonds |  |  |  |  |  |
Commitments and Contingencies [Line Items] |  |  |  |  |  |
Debt instrument maturity year |  |  |  |  |  | 2038
Air Line Pilots Association International |  |  |  |  |  |
Commitments and Contingencies [Line Items] |  |  |  |  |  |
Service contract extended year |  |  |  |  | Jan. 31, 2019 |
Professional Airline Flight Control Association |  |  |  |  |  |
Commitments and Contingencies [Line Items] |  |  |  |  |  |
Service contract extended year |  |  |  | 2021 |  |
Int'1 Association of Machinists |  |  |  |  |  |
Commitments and Contingencies [Line Items] |  |  |  |  |  |
Service contract extended year |  |  |  | 2021 |  | 2021
Number of new contracts extended | Contract |  |  |  | 7 |  | 7
United And The Association Of Flight Attendants |  |  |  |  |  |
Commitments and Contingencies [Line Items] |  |  |  |  |  |
Contract period |  |  | 5 years |  |  |
Int'1 Brotherhood of Teamsters |  |  |  |  |  |
Commitments and Contingencies [Line Items] |  |  |  |  |  |
Contract period |  | 6 years |  |  |  |
Metropolitan Washington Airports Authority | Subsequent Event |  |  |  |  |  |
Commitments and Contingencies [Line Items] |  |  |  |  |  |
Lease extension term | 7 years |  |  |  |  |
Operating lease expiration year | 2024 |  |  |  |  |
United Airlines, Inc. |  |  |  |  |  |
Commitments and Contingencies [Line Items] |  |  |  |  |  |
Borrowed principal amount |  | $ 272,000,000 |  |  |  | $ 272,000,000
Debt instrument maturity year |  |  |  |  |  | 2028
Number of employees | Employee |  | 87,500 |  |  |  | 87,500
Percentage of employees represented by various U.S. labor organizations |  |  |  |  |  | 80.00%
United Airlines, Inc. | EETC |  |  |  |  |  |
Commitments and Contingencies [Line Items] |  |  |  |  |  |
Borrowed principal amount |  | $ 1,700,000,000 |  |  |  | $ 1,700,000,000
Debt instrument principal amount |  | $ 321,000,000 |  |  |  | $ 321,000,000
Capital Addition Purchase Commitments | United Airlines, Inc. |  |  |  |  |  |
Commitments and Contingencies [Line Items] |  |  |  |  |  |
New aircraft, scheduled delivery date |  |  |  |  |  | 2024
Capital Addition Purchase Commitments | United Airlines, Inc. | Boeing 737NG |  |  |  |  |  |
Commitments and Contingencies [Line Items] |  |  |  |  |  |
Number of aircraft expected to be delivered in the remainder of 2016 | Aircraft |  | 7 |  |  |  | 7
Capital Addition Purchase Commitments | United Airlines, Inc. | Boeing 777-300ER Aircraft |  |  |  |  |  |
Commitments and Contingencies [Line Items] |  |  |  |  |  |
Number of aircraft expected to be delivered in the remainder of 2016 | Aircraft |  | 1 |  |  |  | 1

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