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Commitments and Contingencies - Additional Information (Detail) |  | 6 Months Ended
--- | --- | ---
Feb. 17, 2017 Aircraft | Jun. 30, 2017 USD ($) Employee Aircraft
Commitments and Contingencies [Line Items] |  |
Aggregate balance |  | $ 10,900,000,000
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 |  | 432,000,000
Floating Rate Debt |  |
Commitments and Contingencies [Line Items] |  |
Debt instrument principal amount |  | 3,100,000,000
Fixed Rate Debt |  |
Commitments and Contingencies [Line Items] |  |
Debt instrument principal amount |  | 75,000,000
Loans And Leases From Non U S Entities |  |
Commitments and Contingencies [Line Items] |  |
Aggregate balance |  | 3,100,000,000
Aircraft Mortgage Debt |  |
Commitments and Contingencies [Line Items] |  |
Guarantor obligations, maximum exposure |  | $ 163,000,000
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) |  | 11 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) |  | 11 years
United Airlines, Inc. |  |
Commitments and Contingencies [Line Items] |  |
Debt instrument maturity year |  | 2027
Debt instrument principal amount |  | $ 167,000,000
Number of employees | Employee |  | 90,600
Percentage of employees represented by various U.S. labor organizations |  | 80.00%
United Airlines, Inc. | EETC |  |
Commitments and Contingencies [Line Items] |  |
Remaining proceeds from issuance of debt to be received in future periods |  | $ 278,000,000
Debt instrument principal amount |  | $ 1,973,000,000
United Airlines, Inc. | Boeing 777-300ER Aircraft |  |
Commitments and Contingencies [Line Items] |  |
Number of additional aircraft ordered for future delivery | Aircraft |  | 4
United Airlines, Inc. | Boeing 737 MAX 10s |  |
Commitments and Contingencies [Line Items] |  |
Number of aircraft to be converted | Aircraft |  | 100
United Airlines, Inc. | Delivered in Second Half of Twenty Seventeen [Member] | Embraer E175 Aircraft |  |
Commitments and Contingencies [Line Items] |  |
Number of additional aircraft ordered for future delivery | Aircraft |  | 8
United Airlines, Inc. | Capital Addition Purchase Commitments |  |
Commitments and Contingencies [Line Items] |  |
New aircraft, scheduled delivery date |  | 2027
United Airlines, Inc. | Capital Addition Purchase Commitments | Boeing 737NG |  |
Commitments and Contingencies [Line Items] |  |
Number of aircraft expected to be delivered through the remainder of 2017 | Aircraft |  | 4
United Airlines, Inc. | Capital Addition Purchase Commitments | B 787-9 |  |
Commitments and Contingencies [Line Items] |  |
Number of aircraft expected to be delivered through the remainder of 2017 | Aircraft |  | 1
United Airlines, Inc. | Capital Addition Purchase Commitments | Embraer E175 Aircraft |  |
Commitments and Contingencies [Line Items] |  |
Number of aircraft expected to be delivered through the remainder of 2017 | Aircraft |  | 14
United Airlines, Inc. | Capital Addition Purchase Commitments | A319 aircraft |  |
Commitments and Contingencies [Line Items] |  |
Number of aircraft expected to be delivered through the remainder of 2017 | Aircraft |  | 4
Air Wisconsin | Minimum | CRJ 200 |  |
Commitments and Contingencies [Line Items] |  |
Number of aircraft to operate | Aircraft | 50 |
Air Wisconsin | Maximum | CRJ 200 |  |
Commitments and Contingencies [Line Items] |  |
Number of aircraft to operate | Aircraft | 65 |

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