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Commitments and Contingencies - Additional Information (Detail) | 1 Months Ended | 6 Months Ended
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Mar. 31, 2016 Contract | Jan. 31, 2016 | Jun. 30, 2016 USD ($) Employee Aircraft Contract
Tax-exempt special facilities revenue bonds |  |  |
Commitments and Contingencies [Line Items] |  |  |
Guarantor obligations, maximum exposure |  |  | $ 1,900,000,000
Operating leases obligations |  |  | 1,400,000,000
Capital leases obligations |  |  | 342,000,000
Aircraft Mortgage Debt |  |  |
Commitments and Contingencies [Line Items] |  |  |
Guarantor obligations, maximum exposure |  |  | 43,000,000
Guarantor obligations, maximum additional exposure |  |  | 129,000,000
Floating Rate Debt |  |  |
Commitments and Contingencies [Line Items] |  |  |
Debt instrument principal amount |  |  | 2,400,000,000
Fixed Rate Debt |  |  |
Commitments and Contingencies [Line Items] |  |  |
Debt instrument principal amount |  |  | 104,000,000
Loans And Leases From Non U S Entities |  |  |
Commitments and Contingencies [Line Items] |  |  |
Debt instrument principal amount |  |  | $ 2,400,000,000
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 | Tax-exempt special facilities revenue bonds |  |  |
Commitments and Contingencies [Line Items] |  |  |
Debt instrument maturity year |  |  | 2038
Maximum | Loans And Leases From Non U S Entities |  |  |
Commitments and Contingencies [Line Items] |  |  |
Debt instrument, remaining terms (years) |  |  | 12 years
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 Airlines, Inc. |  |  |
Commitments and Contingencies [Line Items] |  |  |
Number of employees | Employee |  |  | 87,500
Percentage of employees represented by various U.S. labor organizations |  |  | 80.00%
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 |  |  | 11
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
Capital Addition Purchase Commitments | United Airlines, Inc. | Embraer E175 Aircraft |  |  |
Commitments and Contingencies [Line Items] |  |  |
Number of aircraft expected to be delivered in the remainder of 2016 | Aircraft |  |  | 5
Number of aircraft expected to be assigned immediately prior to each aircraft's delivery | Aircraft |  |  | 5

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