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CONCESSION ARRANGEMENTS RIGHTS - Financial assets in concession arrangements - Additional information (Details) - COP ($) $ in Millions | Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
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Covioriente [member] |  |  |
Disclosure of detailed information about service concession arrangements [line items] |  |  |
Financial assets, in work in progress | $ 523,216 | $ 715,573 | $ 1,043,138
Covipacifico [member] |  |  |
Disclosure of detailed information about service concession arrangements [line items] |  |  |
Financial assets, in work in progress | $ 541,065 | $ 130,105 | $ 621,988

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- Definition Financial assets in work in progress + References No definition available. + Details
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Namespace Prefix: | aval_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with members defined in one or many axes of the table. + References No definition available. + Details
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Namespace Prefix: | ifrs-full_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | ifrs-full_BusinessCombinationsAxis=aval_CoviorienteMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | ifrs-full_BusinessCombinationsAxis=aval_CovipacificoMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |