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Combined Notes to the Financial Statements (Unaudited) (Details) |  |  | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | --- | --- | ---
Apr. 29, 2021 USD ($) | Jan. 15, 2021 USD ($) | Sep. 30, 2021 | Jun. 30, 2021 USD ($) commitment | Mar. 31, 2021 employee | Jun. 30, 2021 USD ($) commitment employee | Jun. 30, 2020 USD ($) | Jun. 27, 2021 aircraft | Apr. 21, 2021 USD ($)
Unusual or Infrequent Item, or Both [Line Items] |  |  |  |  |  |  |  |  |
Percent of capacity cut |  |  |  | 46.00% |  |  |  |  |
Proceeds from issuance of debt, net of discounts and fees |  |  |  |  |  | $ 11,116,000,000 | $ 4,371,000,000 |  |
Proceeds from the issuance of common stock |  |  |  |  |  | 500,000,000 |  |  |
Forecast |  |  |  |  |  |  |  |  |
Unusual or Infrequent Item, or Both [Line Items] |  |  |  |  |  |  |  |  |
Percent of capacity cut |  |  | 26.00% |  |  |  |  |  |
United Airlines, Inc. |  |  |  |  |  |  |  |  |
Unusual or Infrequent Item, or Both [Line Items] |  |  |  |  |  |  |  |  |
Proceeds from issuance of debt, net of discounts and fees |  |  |  |  |  | $ 11,116,000,000 | $ 4,371,000,000 |  |
Boeing 737 MAX 10 |  |  |  |  |  |  |  |  |
Unusual or Infrequent Item, or Both [Line Items] |  |  |  |  |  |  |  |  |
Number of aircraft committed to purchase | aircraft |  |  |  |  |  |  |  | 150 |
Boeing 737 MAX 8 |  |  |  |  |  |  |  |  |
Unusual or Infrequent Item, or Both [Line Items] |  |  |  |  |  |  |  |  |
Number of aircraft committed to purchase | aircraft |  |  |  |  |  |  |  | 50 |
Airbus A321neo |  |  |  |  |  |  |  |  |
Unusual or Infrequent Item, or Both [Line Items] |  |  |  |  |  |  |  |  |
Number of aircraft committed to purchase |  |  |  | 70 |  | 70 |  | 70 |
B-737-Max |  |  |  |  |  |  |  |  |
Unusual or Infrequent Item, or Both [Line Items] |  |  |  |  |  |  |  |  |
Number of aircraft committed to purchase | aircraft |  |  |  |  |  |  |  | 200 |
PSP2 |  |  |  |  |  |  |  |  |
Unusual or Infrequent Item, or Both [Line Items] |  |  |  |  |  |  |  |  |
Total funding provided under the Payroll Support Program |  | $ 3,000,000,000.0 |  |  |  |  |  |  |
Funding provided through direct grants under the Payroll Support Program |  | 2,100,000,000 |  |  |  |  |  |  |
PSP3 |  |  |  |  |  |  |  |  |
Unusual or Infrequent Item, or Both [Line Items] |  |  |  |  |  |  |  |  |
Total funding provided under the Payroll Support Program | $ 2,800,000,000 |  |  |  |  |  |  |  |
Funding provided through direct grants under the Payroll Support Program | 2,000,000,000.0 |  |  |  |  |  |  |  |
Voluntary Separation Leave Programs | Employee Separation |  |  |  |  |  |  |  |  |
Unusual or Infrequent Item, or Both [Line Items] |  |  |  |  |  |  |  |  |
Number of employees electing to voluntarily separate from the company | employee |  |  |  |  | 4,500 | 4,500 |  |  |
Unsecured Debt | PSP2 Note |  |  |  |  |  |  |  |  |
Unusual or Infrequent Item, or Both [Line Items] |  |  |  |  |  |  |  |  |
Face amount |  |  |  | $ 870,000,000 |  | $ 870,000,000 |  |  |
Term of debt |  |  |  |  |  | 10 years |  |  |
Unsecured Debt | PSP2 Note | PSP2 |  |  |  |  |  |  |  |  |
Unusual or Infrequent Item, or Both [Line Items] |  |  |  |  |  |  |  |  |
Funding provided through loans under the Payroll Support Program |  | $ 870,000,000 |  |  |  |  |  |  |
Term of debt |  | 10 years |  |  |  |  |  |  |
Unsecured Debt | PSP3 Note |  |  |  |  |  |  |  |  |
Unusual or Infrequent Item, or Both [Line Items] |  |  |  |  |  |  |  |  |
Face amount |  |  |  | 810,000,000 |  | $ 810,000,000 |  |  |
Term of debt |  |  |  |  |  | 10 years |  |  |
Unsecured Debt | PSP3 Note | PSP3 |  |  |  |  |  |  |  |  |
Unusual or Infrequent Item, or Both [Line Items] |  |  |  |  |  |  |  |  |
Funding provided through loans under the Payroll Support Program | $ 810,000,000 |  |  |  |  |  |  |  |
Term of debt | 10 years |  |  |  |  |  |  |  |
Secured Debt | 2026 Notes and 2029 Notes |  |  |  |  |  |  |  |  |
Unusual or Infrequent Item, or Both [Line Items] |  |  |  |  |  |  |  |  |
Face amount |  |  |  | 4,000,000,000.0 |  | $ 4,000,000,000.0 |  |  | $ 4,000,000,000.0
Secured Debt | 2026 Notes |  |  |  |  |  |  |  |  |
Unusual or Infrequent Item, or Both [Line Items] |  |  |  |  |  |  |  |  |
Face amount |  |  |  | $ 2,000,000,000.0 |  | $ 2,000,000,000.0 |  |  | $ 2,000,000,000.0
Stated interest rate |  |  |  | 4.375% |  | 4.375% |  |  | 4.375%
Secured Debt | 2029 Notes |  |  |  |  |  |  |  |  |
Unusual or Infrequent Item, or Both [Line Items] |  |  |  |  |  |  |  |  |
Face amount |  |  |  | $ 2,000,000,000.0 |  | $ 2,000,000,000.0 |  |  | $ 2,000,000,000.0
Stated interest rate |  |  |  | 4.625% |  | 4.625% |  |  | 4.625%
Secured Debt | Term Loan B Facility due 2028 |  |  |  |  |  |  |  |  |
Unusual or Infrequent Item, or Both [Line Items] |  |  |  |  |  |  |  |  |
Face amount |  |  |  | $ 5,000,000,000.0 |  | $ 5,000,000,000.0 |  |  | $ 5,000,000,000.0
Secured Debt | Senior Secured Revolving Credit Facility due 2025 | Revolving Credit Facility |  |  |  |  |  |  |  |  |
Unusual or Infrequent Item, or Both [Line Items] |  |  |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  | 1,750,000,000 |  | 1,750,000,000 |  |  | 1,750,000,000
Secured Debt | Term Loan Facility |  |  |  |  |  |  |  |  |
Unusual or Infrequent Item, or Both [Line Items] |  |  |  |  |  |  |  |  |
Face amount |  |  |  | 1,400,000,000 |  | 1,400,000,000 |  |  | 1,400,000,000
Secured Debt | Credit Agreement | Revolving Credit Facility |  |  |  |  |  |  |  |  |
Unusual or Infrequent Item, or Both [Line Items] |  |  |  |  |  |  |  |  |
Face amount |  |  |  | 1,000,000,000.0 |  | 1,000,000,000.0 |  |  | 1,000,000,000.0
Secured Debt | CARES Act Term Loan Facility |  |  |  |  |  |  |  |  |
Unusual or Infrequent Item, or Both [Line Items] |  |  |  |  |  |  |  |  |
Face amount |  |  |  | 520,000,000 |  | 520,000,000 |  |  | $ 520,000,000
Pass-Through Certificates | Class A Pass-Through Certificates Issued February 2021 | United Airlines, Inc. |  |  |  |  |  |  |  |  |
Unusual or Infrequent Item, or Both [Line Items] |  |  |  |  |  |  |  |  |
Face amount |  |  |  | $ 600,000,000 |  | $ 600,000,000 |  |  |
Stated interest rate |  |  |  | 4.88% |  | 4.88% |  |  |
Proceeds from issuance of debt, net of discounts and fees |  |  |  |  |  | $ 600,000,000 |  |  |

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