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Debt (Detail) - USD ($) $ in Millions | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Debt Instrument [Line Items] |  |  |
Less: current portion of long-term debt |  | $ (1,565) | $ (849)
Long-term debt, net |  | 11,703 | 9,918
United Airlines, Inc. |  |  |
Debt Instrument [Line Items] |  |  |
Less: current portion of long-term debt |  | (1,565) | (849)
Long-term debt, net |  | 11,703 | 9,918
UAL and United |  |  |
Debt Instrument [Line Items] |  |  |
Long-term Debt, Gross |  | 13,431 | 10,891
Less: unamortized debt discount, premiums and debt issuance costs |  | (163) | (124)
Less: current portion of long-term debt |  | (1,565) | (849)
Long-term debt, net |  | 11,703 | 9,918
Secured Debt | Notes payable, fixed interest rates of 2.88% to 9.52% (weighted average rate of 4.39% as of December 31, 2017), payable through 2028 | United Airlines, Inc. |  |  |
Debt Instrument [Line Items] |  |  |
Long-term Debt, Gross |  | 8,661 | 7,586
Secured Debt | Notes payable, floating interest rates of the London interbank offered rate ("LIBOR") plus 0.2% to 2.25%, payable through 2028 | United Airlines, Inc. |  |  |
Debt Instrument [Line Items] |  |  |
Long-term Debt, Gross |  | 1,880 | 1,546
Secured Debt | Term Loan Facility Due 2024 | United Airlines, Inc. |  |  |
Debt Instrument [Line Items] |  |  |
Long-term Debt, Gross |  | 1,489 |
Secured Debt | Term Loan Facility Due April 2019 | United Airlines, Inc. |  |  |
Debt Instrument [Line Items] |  |  |
Long-term Debt, Gross |  |  | 866
Secured Debt | Term Loan Facility Due September 2021 | United Airlines, Inc. |  |  |
Debt Instrument [Line Items] |  |  |
Long-term Debt, Gross |  |  | 192
Unsecured Debt | 6.375% Senior Notes due 2018 |  |  |
Debt Instrument [Line Items] |  |  |
Long-term Debt, Gross | [1] | 300 | 300
Unsecured Debt | 6% Senior Notes due 2020 |  |  |
Debt Instrument [Line Items] |  |  |
Long-term Debt, Gross | [1] | 300 | 300
Unsecured Debt | 4.25% Senior Notes due 2022 | United Airlines, Inc. |  |  |
Debt Instrument [Line Items] |  |  |
Long-term Debt, Gross | [1] | 400 |
Unsecured Debt | 5% Senior Notes due 2024 | United Airlines, Inc. |  |  |
Debt Instrument [Line Items] |  |  |
Long-term Debt, Gross | [1] | 300 |
Unsecured Debt | Other Debt | United Airlines, Inc. |  |  |
Debt Instrument [Line Items] |  |  |
Long-term Debt, Gross |  | $ 101 | $ 101
[1] | UAL is the issuer of this debt. United is a guarantor.

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