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RISK MANAGEMENT - Credit risk model - Debt securities (Details) | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Sovereign |  |  |
Disclosure of financial assets [line items] |  |  |
LGD recovery rate weights | 50.00% | 53.00% |
Corporate |  |  |
Disclosure of financial assets [line items] |  |  |
LGD recovery rate weights | 47.10% | 47.40% | 46.90%

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- Definition The percentage of loss given default recovery rate weightage. + References No definition available. + Details
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Namespace Prefix: | aval_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

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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_ClassesOfAssetsAxis=aval_IfrsSovereignDebtSecuritiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | ifrs-full_ClassesOfAssetsAxis=aval_IfrsCorporateDebtSecuritiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |