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Combined Notes to the Financial Statements (Unaudited) (Details) employee in Thousands |  |  |  |  | 1 Months Ended | 2 Months Ended | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Jul. 08, 2020 employee | Jul. 02, 2020 USD ($) | Apr. 20, 2020 USD ($) | Apr. 17, 2020 USD ($) | Jun. 30, 2020 USD ($) | Jun. 30, 2020 USD ($) | Sep. 30, 2020 | Jun. 30, 2020 USD ($) | Jun. 30, 2019 USD ($) | Jul. 02, 2020 USD ($) | Jun. 30, 2020 USD ($) | Jun. 30, 2019 USD ($) | Jun. 15, 2020 shares | Dec. 31, 2019 USD ($)
Unusual or Infrequent Item, or Both [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income (loss) |  |  |  |  |  |  |  | $ (1,627,000,000) | $ 1,052,000,000 |  | $ (3,331,000,000) | $ 1,344,000,000 |  |  |
Percent of capacity cut |  |  |  |  |  |  |  | 88.00% |  |  |  |  |  |  |
Rolling cancellation period |  |  |  |  |  |  |  |  |  |  | 60 days |  |  |  |
Proceeds from issuance of long-term debt |  |  |  |  |  |  |  |  |  |  | $ 1,669,000,000 | 996,000,000 |  |  |
Proceeds from the issuance of common stock |  |  |  |  |  |  |  |  |  |  | 1,100,000,000 |  |  |  |
Payroll taxes deferred under the CARES Act |  |  |  |  |  |  |  |  |  |  | 78,000,000 |  |  |  |
Total funding provided under the Payroll Support Program |  |  | $ 5,000,000,000.0 |  | $ 5,000,000,000.0 | $ 5,000,000,000.0 |  | $ 5,000,000,000.0 |  |  | 5,000,000,000.0 |  |  |  |
Funding provided through direct grants under the Payroll Support Program |  |  | 3,500,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Funding provided through loans under the Payroll Support Program |  |  | $ 1,500,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Support funding received |  |  |  |  |  | 4,500,000,000 |  |  |  |  |  |  |  |  |
Portion of grant recognized as a credit to special charges |  |  |  |  |  |  |  | 1,589,000,000 | 0 |  | 1,589,000,000 | 0 |  |  |
Payroll Support Program deferred credit |  |  |  |  | 1,508,000,000 | 1,508,000,000 |  | 1,508,000,000 |  |  | 1,508,000,000 |  |  |  | $ 0
Remaining balance yet to be received |  |  |  |  | 500,000,000 | 500,000,000 |  | 500,000,000 |  |  | 500,000,000 |  |  |  |
Forecast |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unusual or Infrequent Item, or Both [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percent of capacity cut |  |  |  |  |  |  | 65.00% |  |  |  |  |  |  |  |
Subsequent Event | Forecast |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unusual or Infrequent Item, or Both [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of employees notified of plans for workforce reduction | employee | 36,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity Distribution Agreement |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unusual or Infrequent Item, or Both [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from the issuance of common stock |  |  |  |  | 22,000,000 |  |  |  |  |  |  |  |  |  |
Number of shares issuable under Equity Distribution Agreement (up to) (in shares) | shares |  |  |  |  |  |  |  |  |  |  |  |  |  | 28,000,000 |
Notes, Secured Term Loans and Aircraft Financing |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unusual or Infrequent Item, or Both [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from issuance of long-term debt |  |  |  |  |  |  |  |  |  |  | 3,000,000,000.0 |  |  |  |
Notes, Secured Term Loans and Aircraft Financing | Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unusual or Infrequent Item, or Both [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from issuance of long-term debt |  |  |  |  |  |  |  |  |  | $ 10,000,000,000.0 |  |  |  |  |
Secured Debt and Term Loan |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unusual or Infrequent Item, or Both [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from issuance of long-term debt |  |  |  |  |  |  |  |  |  |  | 6,800,000,000 |  |  |  |
Secured Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unusual or Infrequent Item, or Both [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Expected borrowings |  |  |  | $ 4,500,000,000 |  |  |  |  |  |  |  |  |  |  |
Expected term of debt |  |  |  | 5 years |  |  |  |  |  |  |  |  |  |  |
Secured Debt | PSP Note |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unusual or Infrequent Item, or Both [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Face amount |  |  |  |  | $ 1,300,000,000 | $ 1,300,000,000 |  | $ 1,300,000,000 |  |  | $ 1,300,000,000 |  |  |  |
Unsecured Debt | PSP Note |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unusual or Infrequent Item, or Both [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Term of debt |  |  | 10 years |  |  |  |  | 10 years |  |  |  |  |  |  |
Percent increase in the principal amount based on any disbursement made by the U.S. Treasury Department |  |  |  |  | 30.00% | 30.00% |  | 30.00% |  |  | 30.00% |  |  |  |
U.S. Department of Treasury Warrants |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unusual or Infrequent Item, or Both [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Warrants oustanding |  |  |  |  | $ 57,000,000 | $ 57,000,000 |  | $ 57,000,000 |  |  | $ 57,000,000 |  |  |  |
CEO and President |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unusual or Infrequent Item, or Both [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Voluntary pay reduction |  |  |  |  |  |  |  |  |  |  | 100.00% |  |  |  |
Non-Employee Directors |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unusual or Infrequent Item, or Both [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Voluntary pay reduction |  |  |  |  |  |  |  |  |  |  | 100.00% |  |  |  |
United Airlines, Inc. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unusual or Infrequent Item, or Both [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income (loss) |  |  |  |  |  |  |  | (1,626,000,000) | $ 1,052,000,000 |  | $ (3,330,000,000) | 1,345,000,000 | [1] |  |
Proceeds from issuance of long-term debt |  |  |  |  |  |  |  |  |  |  | 1,669,000,000 | $ 996,000,000 |  |  |
Payroll Support Program deferred credit |  |  |  |  | $ 1,508,000,000 | $ 1,508,000,000 |  | $ 1,508,000,000 |  |  | $ 1,508,000,000 |  |  |  | $ 0
Revolving Credit Facility | United Airlines, Inc. | Secured Debt | Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unusual or Infrequent Item, or Both [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount available under credit facility |  | $ 2,000,000,000.0 |  |  |  |  |  |  |  | $ 2,000,000,000.0 |  |  |  |  |
LIBOR | Revolving Credit Facility | United Airlines, Inc. | Secured Debt | Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unusual or Infrequent Item, or Both [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from lines of credit |  | $ 1,000,000,000.0 |  |  |  |  |  |  |  |  |  |  |  |  |
[1] | Transition adjustment due to the adoption of Accounting Standards Update No. 2016-13, Financial Instruments—Credit Losses. See Note 1 to the financial statements contained in Part I, Item 1 of this report for additional information.

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