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Commitments and Contingencies - Additional Information (Detail) $ in Millions | 1 Months Ended | 3 Months Ended | 9 Months Ended
--- | --- | --- | ---
Mar. 31, 2018 | Jun. 30, 2018 | Sep. 30, 2018 USD ($) employee commitment aircraft
Commitments and Contingencies [Line Items] |  |  |
Operating leases obligations |  |  | $ 12,931
United Airlines, Inc. |  |  |
Commitments and Contingencies [Line Items] |  |  |
Principal |  |  | $ 1,161
Number of employees | employee |  |  | 90,900
Percentage of employees represented by various U.S. labor organizations |  |  | 82.00%
Tax-exempt special facilities revenue bonds |  |  |
Commitments and Contingencies [Line Items] |  |  |
Guarantor obligations, maximum exposure |  |  | $ 2,000
Operating leases obligations |  |  | 1,400
Capital leases obligations |  |  | 466
Floating Rate Debt |  |  |
Commitments and Contingencies [Line Items] |  |  |
Principal |  |  | 3,200
Fixed Rate Debt |  |  |
Commitments and Contingencies [Line Items] |  |  |
Principal |  |  | 35
Loans And Leases From Non U S Entities |  |  |
Commitments and Contingencies [Line Items] |  |  |
Aggregate balance |  |  | 3,100
Aircraft Mortgage Debt |  |  |
Commitments and Contingencies [Line Items] |  |  |
Guarantor obligations, maximum exposure |  |  | $ 148
Maximum |  |  |
Commitments and Contingencies [Line Items] |  |  |
Debt instrument, remaining terms (years) |  |  | 10 years
Maximum | Loans And Leases From Non U S Entities |  |  |
Commitments and Contingencies [Line Items] |  |  |
Debt instrument, remaining terms (years) |  |  | 10 years
Chicago O'Hare International Airport | March 2018 Facility and Other Operating Leases |  |  |
Commitments and Contingencies [Line Items] |  |  |
Operating lease agreement term | 15 years |  |
Chicago O'Hare International Airport | May 2018 Facility and Other Operating Leases | Minimum |  |  |
Commitments and Contingencies [Line Items] |  |  |
Operating lease agreement term |  | 15 years |
Chicago O'Hare International Airport | May 2018 Facility and Other Operating Leases | Maximum |  |  |
Commitments and Contingencies [Line Items] |  |  |
Operating lease agreement term |  | 30 years |
Boeing 787 |  |  |
Commitments and Contingencies [Line Items] |  |  |
Number of aircrafts expects to take delivery | aircraft |  |  | 3
Number of aircraft committed to purchase | commitment |  |  | 27
Boeing 737 MAX |  |  |
Commitments and Contingencies [Line Items] |  |  |
Number of aircrafts expects to take delivery | aircraft |  |  | 3
Number of aircraft committed to purchase | commitment |  |  | 154
Boeing 777-300ER Aircraft |  |  |
Commitments and Contingencies [Line Items] |  |  |
Number of aircraft expected to be delivered through the remainder of 2018 | aircraft |  |  | 1
Airbus A319 Aircraft |  |  |
Commitments and Contingencies [Line Items] |  |  |
Number of aircraft committed to purchase | aircraft |  |  | 20
Embraer ERJ 145 |  |  |
Commitments and Contingencies [Line Items] |  |  |
Number of leased aircraft | aircraft |  |  | 54

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