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SPECIAL CHARGES - Narrative (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Restructuring and Related Activities [Abstract] |  |  |
Charges related to prepayment, refinancing and partial prepayment of debt | $ 128 | $ 11 | $ 7
Expense associated with employee agreements | $ 0 | $ 814 | $ 0

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- Definition Debt Extinguishment and Modification Fees, Non-Operating + References No definition available. + Details
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Namespace Prefix: | ual_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Labor Contract Ratification Bonus + References No definition available. + Details
Name: | ual_LaborContractRatificationBonus
Namespace Prefix: | ual_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- References No definition available. + Details
Name: | us-gaap_RestructuringAndRelatedActivitiesAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration