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RISK MANAGEMENT - Scenario of probability weighting in measuring ECL (Details) | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023
COLOMBIA | Scenario A |  |
Disclosure of financial assets [line items] |  |
Scenario probability weighting in measuring ECL (as a percent) | 27.00% | 27.00%
COLOMBIA | Scenario B |  |
Disclosure of financial assets [line items] |  |
Scenario probability weighting in measuring ECL (as a percent) | 56.00% | 56.00%
COLOMBIA | Scenario C |  |
Disclosure of financial assets [line items] |  |
Scenario probability weighting in measuring ECL (as a percent) | 17.00% | 17.00%
PANAMA | Scenario A |  |
Disclosure of financial assets [line items] |  |
Scenario probability weighting in measuring ECL (as a percent) | 15.00% | 10.00%
PANAMA | Scenario B |  |
Disclosure of financial assets [line items] |  |
Scenario probability weighting in measuring ECL (as a percent) | 75.00% | 50.00%
PANAMA | Scenario C |  |
Disclosure of financial assets [line items] |  |
Scenario probability weighting in measuring ECL (as a percent) | 10.00% | 40.00%

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- Definition Percentage of scenario probability weighting in measuring ECL. + References No definition available. + Details
Name: | aval_PercentageOfScenarioProbabilityWeightingInMeasuringExpectedCreditLosses
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
Name: | ifrs-full_DisclosureOfFinancialAssetsLineItems
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | ifrs-full_GeographicalAreasAxis=country_CO
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | srt_StatementScenarioAxis=aval_ScenarioMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | srt_StatementScenarioAxis=aval_ScenarioBMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | srt_StatementScenarioAxis=aval_ScenarioCMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | ifrs-full_GeographicalAreasAxis=country_PA
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |