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RISK MANAGEMENT - Credit risk model scenarios - Proportion of assets in Stage 2 (Details) | Dec. 31, 2024 | Dec. 31, 2023
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Commercial lending portfolio [member] | Scenario A |  |
Disclosure of financial assets [line items] |  |
Proportion of Assets in Stage 2 | 3.20% | 3.60%
Commercial lending portfolio [member] | Scenario B |  |
Disclosure of financial assets [line items] |  |
Proportion of Assets in Stage 2 | 3.20% | 3.60%
Commercial lending portfolio [member] | Scenario C |  |
Disclosure of financial assets [line items] |  |
Proportion of Assets in Stage 2 | 3.80% | 3.90%
Loans to consumers [member] | Scenario A |  |
Disclosure of financial assets [line items] |  |
Proportion of Assets in Stage 2 | 7.60% | 6.90%
Loans to consumers [member] | Scenario B |  |
Disclosure of financial assets [line items] |  |
Proportion of Assets in Stage 2 | 8.20% | 7.10%
Loans to consumers [member] | Scenario C |  |
Disclosure of financial assets [line items] |  |
Proportion of Assets in Stage 2 | 8.70% | 7.60%
Mortgages [member] | Scenario A |  |
Disclosure of financial assets [line items] |  |
Proportion of Assets in Stage 2 | 6.00% | 5.60%
Mortgages [member] | Scenario B |  |
Disclosure of financial assets [line items] |  |
Proportion of Assets in Stage 2 | 8.40% | 5.70%
Mortgages [member] | Scenario C |  |
Disclosure of financial assets [line items] |  |
Proportion of Assets in Stage 2 | 8.40% | 5.70%
Microcredit [member] | Scenario A |  |
Disclosure of financial assets [line items] |  |
Proportion of Assets in Stage 2 | 0.90% | 5.00%
Microcredit [member] | Scenario B |  |
Disclosure of financial assets [line items] |  |
Proportion of Assets in Stage 2 | 0.90% | 5.00%
Microcredit [member] | Scenario C |  |
Disclosure of financial assets [line items] |  |
Proportion of Assets in Stage 2 | 0.90% | 5.00%

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- Definition Proportion of loss allowance to gross exposure. + References No definition available. + Details
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Namespace Prefix: | aval_
Data Type: | dtr-types:percentItemType
Balance Type: | na
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
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_ClassesOfFinancialAssetsAxis=aval_CommercialLendingPortfolioMember
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_ClassesOfFinancialAssetsAxis=ifrs-full_ConsumerLoansMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | ifrs-full_ClassesOfFinancialAssetsAxis=ifrs-full_MortgagesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | ifrs-full_ClassesOfFinancialAssetsAxis=aval_MicrocreditMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |