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Income Taxes - Narrative (Details) - USD ($) $ in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Income Taxes [Line Items] |  |  |
Capital loss carryforwards, valuation allowance | $ 175 |  |
Unrecognized tax benefits | 58 | $ 55 | $ 57
Unrecognized tax benefits that would impact effective tax rate if recognized | 58 |  |
Federal |  |  |
Income Taxes [Line Items] |  |  |
NOL carryforwards | 13,200 |  |
Tax effected amount of NOLs | 2,800 |  |
Tax credits | 44 |  |
Deferred tax asset, portion to be utilized against deferred tax liabilities | 6,700 |  |
Deferred tax asset, portion to be utilized against future taxable income | 800 |  |
Federal | United Airlines, Inc. |  |  |
Income Taxes [Line Items] |  |  |
NOL carryforwards | 13,200 |  |
Tax effected amount of NOLs | 2,800 |  |
NOLs without an expiration date | $ 11,600 |  |
Federal | Minimum |  |  |
Income Taxes [Line Items] |  |  |
Tax credit expiration period | 1 year |  |
Federal | Maximum |  |  |
Income Taxes [Line Items] |  |  |
Tax credit expiration period | 20 years |  |
Federal | 2026 | United Airlines, Inc. |  |  |
Income Taxes [Line Items] |  |  |
NOL carryforwards | $ 100 |  |
Federal | 2028 | United Airlines, Inc. |  |  |
Income Taxes [Line Items] |  |  |
NOL carryforwards | 500 |  |
Federal | 2029 | United Airlines, Inc. |  |  |
Income Taxes [Line Items] |  |  |
NOL carryforwards | 400 |  |
Federal | 2032 | United Airlines, Inc. |  |  |
Income Taxes [Line Items] |  |  |
NOL carryforwards | 200 |  |
Federal | 2033 | United Airlines, Inc. |  |  |
Income Taxes [Line Items] |  |  |
NOL carryforwards | 400 |  |
State |  |  |
Income Taxes [Line Items] |  |  |
Tax credits | 45 |  |
NOL and tax credit carryforwards, valuation allowance | 24 |  |
State | United Airlines, Inc. |  |  |
Income Taxes [Line Items] |  |  |
NOL carryforwards | 3,900 |  |
Tax effected amount of NOLs | $ 200 |  |
State | Minimum |  |  |
Income Taxes [Line Items] |  |  |
Tax credit expiration period | 1 year |  |
State | Minimum | United Airlines, Inc. |  |  |
Income Taxes [Line Items] |  |  |
NOL expiration period | 1 year |  |
State | Maximum |  |  |
Income Taxes [Line Items] |  |  |
Tax credit expiration period | 15 years |  |
State | Maximum | United Airlines, Inc. |  |  |
Income Taxes [Line Items] |  |  |
NOL expiration period | 20 years |  |

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