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Debt (Parenthetical) (Detail) | 12 Months Ended
--- | ---
Dec. 31, 2016 | Dec. 31, 2015
United Airlines, Inc. | Minimum |  |  |
Debt Instrument [Line Items] |  |  |
Debt instrument, maturity date |  | 2026 |
United Airlines, Inc. | Maximum |  |  |
Debt Instrument [Line Items] |  |  |
Debt instrument, maturity date |  | 2028 |
Notes payable, fixed interest rates of 1.42% to 9.75% (weighted average rate of 4.85% as of December 31, 2016), payable through 2028 | United Airlines, Inc. | Secured Debt |  |  |
Debt Instrument [Line Items] |  |  |
Weighted average interest rate |  | 4.85% | 4.85%
Debt instrument, maturity date |  | 2028 | 2028
Notes payable, fixed interest rates of 1.42% to 9.75% (weighted average rate of 4.85% as of December 31, 2016), payable through 2028 | United Airlines, Inc. | Secured Debt | Minimum |  |  |
Debt Instrument [Line Items] |  |  |
Debt instrument stated interest rate |  | 1.42% | 1.42%
Notes payable, fixed interest rates of 1.42% to 9.75% (weighted average rate of 4.85% as of December 31, 2016), payable through 2028 | United Airlines, Inc. | Secured Debt | Maximum |  |  |
Debt Instrument [Line Items] |  |  |
Debt instrument stated interest rate |  | 9.75% | 9.75%
Notes payable, floating interest rates of the London Interbank Offered Rate ("LIBOR") plus 0.20% to 2.85%, payable through 2028 | United Airlines, Inc. | Secured Debt |  |  |
Debt Instrument [Line Items] |  |  |
Debt instrument, maturity date |  | 2028 | 2028
Notes payable, floating interest rates of the London Interbank Offered Rate ("LIBOR") plus 0.20% to 2.85%, payable through 2028 | United Airlines, Inc. | Secured Debt | LIBOR | Minimum |  |  |
Debt Instrument [Line Items] |  |  |
Debt instrument, basis spread on variable rate |  | 0.20% | 0.20%
Notes payable, floating interest rates of the London Interbank Offered Rate ("LIBOR") plus 0.20% to 2.85%, payable through 2028 | United Airlines, Inc. | Secured Debt | LIBOR | Maximum |  |  |
Debt Instrument [Line Items] |  |  |
Debt instrument, basis spread on variable rate |  | 2.85% | 2.85%
Term Loan Facility Due April 2019 | United Airlines, Inc. | Secured Debt |  |  |
Debt Instrument [Line Items] |  |  |
Debt instrument, maturity date |  | 2019 | 2019
Term Loan Facility Due April 2019 | United Airlines, Inc. | Secured Debt | LIBOR |  |  |
Debt Instrument [Line Items] |  |  |
Debt instrument, basis spread on variable rate |  | 2.50% | 2.50%
Term Loan Facility Due April 2019 | United Airlines, Inc. | Secured Debt | Interest Rate Floor |  |  |
Debt Instrument [Line Items] |  |  |
Debt instrument, basis spread on variable rate |  | 0.75% | 0.75%
Term Loan Facility Due April 2019 | United Airlines, Inc. | Secured Debt | Certain Market Interest Rates |  |  |
Debt Instrument [Line Items] |  |  |
Debt instrument, basis spread on variable rate |  | 1.50% | 1.50%
Term Loan Facility Due September 2021 | United Airlines, Inc. | Secured Debt |  |  |
Debt Instrument [Line Items] |  |  |
Debt instrument, maturity date |  | 2021 | 2021
Term Loan Facility Due September 2021 | United Airlines, Inc. | Secured Debt | LIBOR |  |  |
Debt Instrument [Line Items] |  |  |
Debt instrument, basis spread on variable rate |  | 2.75% | 2.75%
Term Loan Facility Due September 2021 | United Airlines, Inc. | Secured Debt | Interest Rate Floor |  |  |
Debt Instrument [Line Items] |  |  |
Debt instrument, basis spread on variable rate |  | 0.75% | 0.75%
Term Loan Facility Due September 2021 | United Airlines, Inc. | Secured Debt | Certain Market Interest Rates |  |  |
Debt Instrument [Line Items] |  |  |
Debt instrument, basis spread on variable rate |  | 1.75% | 1.75%
6% Senior Notes due 2020 |  |  |
Debt Instrument [Line Items] |  |  |
Debt instrument stated interest rate |  | 6.00% |
6% Senior Notes due 2020 | Unsecured Debt |  |  |
Debt Instrument [Line Items] |  |  |
Debt instrument stated interest rate | [1] | 6.00% | 6.00%
Debt instrument, maturity date | [1] | 2020 | 2020
6.375% Senior Notes due 2018 |  |  |
Debt Instrument [Line Items] |  |  |
Debt instrument stated interest rate |  | 6.375% |
6.375% Senior Notes due 2018 | Unsecured Debt |  |  |
Debt Instrument [Line Items] |  |  |
Debt instrument stated interest rate | [1] | 6.375% | 6.375%
Debt instrument, maturity date | [1] | 2018 | 2018
[1] | UAL is the issuer of this debt. United is a guarantor.

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- Definition Contractual interest rate for funds borrowed, under the debt agreement. + 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(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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