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RISK MANAGEMENT - Credit risk model - Debt securities (Details)	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
Sovereign
Disclosure of financial assets [line items]
LGD recovery rate weights	53.00%	50.00%
Corporate
Disclosure of financial assets [line items]
LGD recovery rate weights	46.90%	47.10%

X

- Definition

The percentage of loss given default recovery rate weightage.

+ References

No definition available.

+ Details

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Namespace Prefix:	aval_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

X

- 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

X

- Details

Name:	ifrs-full_ClassesOfAssetsAxis=aval_IfrsSovereignDebtSecuritiesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	ifrs-full_ClassesOfAssetsAxis=aval_IfrsCorporateDebtSecuritiesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: