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INCOME TAX - Withholdings tax on dividends paid between entities (Details) - COP ($) $ in Millions | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023
Disclosure of income tax [abstract] |  |
Withholdings tax on dividends paid to entities | $ (15,885) | $ (164)

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- References No definition available. + Details
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Namespace Prefix: | aval_
Data Type: | xbrli:stringItemType
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Period Type: | duration

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- Definition Withholdings tax on dividends paid to entities + References No definition available. + Details
Name: | aval_WithholdingsTaxOnDividendsPaidToEntities
Namespace Prefix: | aval_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration