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Debt - Additional Information (Detail) - United Airlines, Inc. - USD ($) shares in Millions, $ in Millions |  |  | 3 Months Ended | 6 Months Ended
--- | --- | --- | --- | ---
May 01, 2015 | Apr. 01, 2015 | Mar. 31, 2015 | Jun. 30, 2016
Unsecured Debt | 4.5% Convertible Notes Due 2015 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt instrument stated interest rate |  |  |  | 4.50%
Long-term Debt, Gross |  |  | $ 202 |
Common stock issued in exchange for convertible notes |  |  | 11 |
Debt instrument maturity year |  |  |  | 2015
Unsecured Debt | 6% Notes Due 2026 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt instrument stated interest rate |  |  | 6.00% |
Debt instrument maturity year |  |  | 2026 |
Debt purchased and retired |  | $ 303 | $ 18 |
Unsecured Debt | 6% Notes Due 2028 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt instrument stated interest rate |  |  | 6.00% |
Debt instrument maturity year |  |  | 2028 |
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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- Definition Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(16)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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