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Debt (Detail) - USD ($) $ in Millions | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | ---
Debt Instrument [Line Items] |  |  |
Less: current portion of long-term debt |  | $ (849) | $ (1,224)
Long-term debt, net |  | 9,918 | 9,673
United Airlines, Inc. |  |  |
Debt Instrument [Line Items] |  |  |
Less: current portion of long-term debt |  | (849) | (1,224)
Long-term debt, net |  | 9,918 | 9,673
UAL and United |  |  |
Debt Instrument [Line Items] |  |  |
Long-term Debt, Gross |  | 10,891 | 11,042
Less: unamortized debt discount, premiums and debt issuance costs |  | (124) | (145)
Less: current portion of long-term debt |  | (849) | (1,224)
Long-term debt, net |  | 9,918 | 9,673
Secured Debt | 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. |  |  |
Debt Instrument [Line Items] |  |  |
Long-term Debt, Gross |  | 7,586 | 7,971
Secured Debt | Notes payable, floating interest rates of the London Interbank Offered Rate ("LIBOR") plus 0.20% to 2.85%, payable through 2028 | United Airlines, Inc. |  |  |
Debt Instrument [Line Items] |  |  |
Long-term Debt, Gross |  | 1,546 | 1,302
Secured Debt | Term Loan Facility Due April 2019 | United Airlines, Inc. |  |  |
Debt Instrument [Line Items] |  |  |
Long-term Debt, Gross |  | 866 | 875
Secured Debt | Term Loan Facility Due September 2021 | United Airlines, Inc. |  |  |
Debt Instrument [Line Items] |  |  |
Long-term Debt, Gross |  | 192 | 194
Unsecured Debt | 6% Senior Notes due 2020 |  |  |
Debt Instrument [Line Items] |  |  |
Long-term Debt, Gross | [1] | 300 | 300
Unsecured Debt | 6.375% Senior Notes due 2018 |  |  |
Debt Instrument [Line Items] |  |  |
Long-term Debt, Gross | [1] | 300 | 300
Unsecured Debt | Other Debt | United Airlines, Inc. |  |  |
Debt Instrument [Line Items] |  |  |
Long-term Debt, Gross |  | $ 101 | $ 100
[1] | UAL is the issuer of this debt. United is a guarantor.

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