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INCOME TAXES - Narrative (Details) - USD ($) $ in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Income Taxes [Line Items] |  |  |
Capital loss carryforwards, valuation allowance | $ 179 |  |
Unrecognized tax benefits | 70 | $ 66 | $ 58
Federal | United Airlines, Inc. |  |  |
Income Taxes [Line Items] |  |  |
NOL carryforwards | 9,700 |  |
Tax effected amount of NOLs | 2,000 |  |
NOLs without an expiration date | 9,600 |  |
Federal | United Airlines, Inc. | 2029 |  |  |
Income Taxes [Line Items] |  |  |
NOL carryforwards | 100 |  |
State |  |  |
Income Taxes [Line Items] |  |  |
Tax credits | 58 |  |
NOL and tax credit carryforwards, valuation allowance | $ 29 |  |
State | Minimum |  |  |
Income Taxes [Line Items] |  |  |
Tax credit expiration period | 1 year |  |
State | Maximum |  |  |
Income Taxes [Line Items] |  |  |
Tax credit expiration period | 15 years |  |
State | United Airlines, Inc. |  |  |
Income Taxes [Line Items] |  |  |
NOL carryforwards | $ 3,000 |  |
Tax effected amount of NOLs | $ 200 |  |
State | United Airlines, Inc. | Minimum |  |  |
Income Taxes [Line Items] |  |  |
NOL expiration period | 1 year |  |
State | United Airlines, Inc. | Maximum |  |  |
Income Taxes [Line Items] |  |  |
NOL expiration period | 20 years |  |

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