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Debt - Summary of Long-Term Debt (Details) - USD ($) $ in Millions | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jan. 31, 2017
Debt Instrument [Line Items] |  |  |  |  |
Less: current portion of long-term debt | $ (1,230) | $ (1,565) | [1] |  |
Long-term debt, net | 12,215 | 11,703 | [1] |  |
United Airlines, Inc. |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Less: current portion of long-term debt | (1,230) | (1,565) | [2] |  |
Long-term debt, net | 12,215 | 11,703 | [2] |  |
UAL and United |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Long term debt | 13,636 | 13,431 |  |  |
Less: unamortized debt discount, premiums and debt issuance costs | (191) | (163) |  |  |
Less: current portion of long-term debt | (1,230) | (1,565) |  |  |
Long-term debt, net | $ 12,215 | 11,703 |  |  |
6.375% Senior Notes due 2018 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Fixed interest rate | 6.375% |  |  |  |
6% Senior Notes due 2020 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Fixed interest rate | 6.00% |  |  |  |
4.25% Senior Notes due 2022 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Fixed interest rate | 4.25% |  |  |  |
4.25% Senior Notes due 2022 | United Airlines, Inc. |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Fixed interest rate |  |  |  | 4.25% |
5% Senior Notes due 2024 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Fixed interest rate | 5.00% |  |  |  |
5% Senior Notes due 2024 | United Airlines, Inc. |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Fixed interest rate |  |  |  |  | 5.00%
Secured Debt | Notes payable, fixed interest rates of 0.0% to 9.52% (weighted average rate of 4.18% as of December 31, 2018), payable through 2030 | United Airlines, Inc. |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Long term debt | $ 8,811 | 8,661 |  |  |
Weighted average rate | 4.18% |  |  |  |
Maturity date | 2030 |  |  |  |
Secured Debt | Notes payable, fixed interest rates of 0.0% to 9.52% (weighted average rate of 4.18% as of December 31, 2018), payable through 2030 | Minimum | United Airlines, Inc. |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Fixed interest rate | 0.00% |  |  |  |
Secured Debt | Notes payable, fixed interest rates of 0.0% to 9.52% (weighted average rate of 4.18% as of December 31, 2018), payable through 2030 | Maximum | United Airlines, Inc. |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Fixed interest rate | 9.52% |  |  |  |
Secured Debt | Notes payable, floating interest rates of the London interbank offered rate (LIBOR) plus 1.05% to 1.75%, payable through 2030 | United Airlines, Inc. |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Long term debt | $ 2,051 | 1,880 |  |  |
Secured Debt | Notes payable, floating interest rates of the London interbank offered rate (LIBOR) plus 1.05% to 1.75%, payable through 2030 | Maximum | United Airlines, Inc. |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Maturity date | 2030 |  |  |  |
Secured Debt | Notes payable, floating interest rates of the London interbank offered rate (LIBOR) plus 1.05% to 1.75%, payable through 2030 | LIBOR | Minimum | United Airlines, Inc. |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Basis spread on variable rate | 1.05% |  |  |  |
Secured Debt | Notes payable, floating interest rates of the London interbank offered rate (LIBOR) plus 1.05% to 1.75%, payable through 2030 | LIBOR | Maximum | United Airlines, Inc. |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Basis spread on variable rate | 1.75% |  |  |  |
Secured Debt | Term loan, LIBOR plus 1.75%, or alternative rate based on certain market rates plus 0.75%, due 2024 | United Airlines, Inc. |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Long term debt | $ 1,474 | 1,489 |  |  |
Maturity date | 2024 |  |  |  |
Secured Debt | Term loan, LIBOR plus 1.75%, or alternative rate based on certain market rates plus 0.75%, due 2024 | LIBOR | United Airlines, Inc. |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Basis spread on variable rate | 1.75% |  |  |  |
Secured Debt | Term loan, LIBOR plus 1.75%, or alternative rate based on certain market rates plus 0.75%, due 2024 | Alternative Rate Based on Certain Market Interest Rates | United Airlines, Inc. |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Basis spread on variable rate | 0.75% |  |  |  |
Unsecured Debt | 6.375% Senior Notes due 2018 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Long term debt | $ 0 | 300 |  |  |
Fixed interest rate | 6.375% |  |  |  |
Maturity date | 2018 |  |  |  |
Unsecured Debt | 6% Senior Notes due 2020 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Long term debt | $ 300 | 300 |  |  |
Fixed interest rate | 6.00% |  |  |  |
Maturity date | 2020 |  |  |  |
Unsecured Debt | 4.25% Senior Notes due 2022 | United Airlines, Inc. |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Long term debt | $ 400 | 400 |  |  |
Fixed interest rate | 4.25% |  |  |  |
Maturity date | 2022 |  |  |  |
Unsecured Debt | 5% Senior Notes due 2024 | United Airlines, Inc. |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Long term debt | $ 300 | 300 |  |  |
Fixed interest rate | 5.00% |  |  |  |
Maturity date | 2024 |  |  |  |
Unsecured Debt | Other | United Airlines, Inc. |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Long term debt | $ 300 | $ 101 |  |  |
[1] | Amounts adjusted due to the adoption of Accounting Standards Update No. 2014-09, Revenue from Contracts with Customers (Topic 606). See Note 1 to the financial statements contained in Part II, Item 8 of this report for additional information.
[2] | Amounts adjusted due to the adoption of Accounting Standards Update No. 2014-09, Revenue from Contracts with Customers (Topic 606). See Note 1 to the financial statements contained in Part II, Item 8 of this report for additional information.

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