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EQUITY ATTRIBUTABLE TO OWNERS OF THE PARENT - Appropriated retained earnings (Details) - COP ($) $ in Millions | Dec. 31, 2024 | Dec. 31, 2023
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Disclosure of classes of share capital [abstract] |  |
Retained earnings | $ 807,629 | $ 525,153
Accumulated withholding tax over dividends | (30,145) | (26,135)
Legal reserve | 11,872 | 11,872
Statutory and voluntary reserves | 7,374,078 | 7,220,883
Retained earnings | $ 8,163,434 | $ 7,731,773

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- Definition A component of equity representing legal reserve. + References No definition available. + Details
Name: | aval_LegalReserve
Namespace Prefix: | aval_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition A component of equity representing withholding tax. + References No definition available. + Details
Name: | aval_OtherReserveTaxWithholding
Namespace Prefix: | aval_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- References No definition available. + Details
Name: | ifrs-full_DisclosureOfClassesOfShareCapitalAbstract
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition A component of equity representing reserves within equity, not including retained earnings. [Refer: Retained earnings] + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Name IAS -Number 1 -IssueDate 2024-01-01 -Paragraph 78 -Subparagraph e -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2024-en-r&anchor=para_78_e&doctype=Standard -URIDate 2024-03-27 + Details
Name: | ifrs-full_OtherReserves
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition A component of equity representing the entity's cumulative undistributed earnings or deficit. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Name IAS -Number 1 -IssueDate 2024-01-01 -Paragraph IG6 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2024-en-r&anchor=para_IG6&doctype=Implementation%20Guidance -URIDate 2024-03-27 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Name IAS -Number 1 -IssueDate 2024-01-01 -Paragraph 78 -Subparagraph e -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2024-en-r&anchor=para_78_e&doctype=Standard -URIDate 2024-03-27 + Details
Name: | ifrs-full_RetainedEarnings
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition A component of equity representing reserves created based on legal requirements. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2024-01-01 -Paragraph 55 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2024-en-r&anchor=para_55&doctype=Standard -URIDate 2024-03-27 + Details
Name: | ifrs-full_StatutoryReserve
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant