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Debt - Additional Information (Detail) - United Airlines, Inc. - USD ($) shares in Millions, $ in Millions |  |  | 3 Months Ended | 6 Months Ended | 9 Months Ended
--- | --- | --- | --- | --- | ---
May 01, 2015 | Apr. 01, 2015 | Mar. 31, 2015 | Jun. 30, 2016 | Sep. 30, 2016
Debt Instrument [Line Items] |  |  |  |  |
Borrowed principal amount |  |  |  |  | $ 272
Debt instrument maturity year |  |  |  |  | 2028
Unsecured Debt | 4.5% Convertible Notes Due 2015 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt instrument maturity year |  |  |  | 2015 |
Debt instrument stated interest rate |  |  |  | 4.50% |
Long-term Debt, Gross |  |  | $ 202 |  |
Common stock issued in exchange for convertible notes |  |  | 11 |  |
Unsecured Debt | 6% Notes Due 2026 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt instrument maturity year |  |  | 2026 |  |
Debt instrument stated interest rate |  |  | 6.00% |  |
Debt purchased and retired |  | $ 303 | $ 18 |  |
Unsecured Debt | 6% Notes Due 2028 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt instrument maturity year |  |  | 2028 |  |
Debt instrument stated interest rate |  |  | 6.00% |  |
Debt purchased and retired | $ 298 |  | $ 13 |  |
Secured Debt | Revolving Credit Facility |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Available under revolving credit facility |  |  |  |  | $ 1,350

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