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INVESTMENT SECURITIES - Amounts reclassified to profit or loss from OCI before taxes (Details) - COP ($) $ in Millions | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023
Disclosure of investment securities [abstract] |  |
Redemptions or sales | $ (130,219) | $ (104,012)
ECL allowance | 4,616 | 1,236
Total reclassified to profit or loss | $ (125,603) | $ (102,776)

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- Definition The amount reclassified to profit or loss from other comprehensive income before tax. + References No definition available. + Details
Name: | aval_AmountReclassifiedToProfitOrLossFromOtherComprehensiveIncomeBeforeTax
Namespace Prefix: | aval_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Disclosure of investment securities [abstract] + References No definition available. + Details
Name: | aval_DisclosureOfInvestmentSecuritiesAbstract
Namespace Prefix: | aval_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Amount of expected credit loss allowance reclassified from other comprehensive income before tax to profit or loss. + References No definition available. + Details
Name: | aval_ExpectedCreditLossAllowancesReclassifiedFromOCIBeforeTaxToProfitOrLoss
Namespace Prefix: | aval_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Amount of redemption or sales reclassified from other comprehensive income before tax to profit or loss. + References No definition available. + Details
Name: | aval_RedemptionsOrSalesReclassifiedFromOCIBeforeTaxToProfitOrLoss
Namespace Prefix: | aval_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration