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EMPLOYEE BENEFITS - Textual (Details)	Dec. 31, 2024
Disclosure of defined benefit plans [abstract]
Percentage of reasonably possible increase and decrease in actuarial assumption	0.50%

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- Definition

Represents the percentage of reasonably possible increase decrease in actuarial assumptions.

+ References

No definition available.

+ Details

Name:	aval_PercentageOfReasonablyPossibleIncreaseAndDecreaseInActuarialAssumption
Namespace Prefix:	aval_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

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- References

No definition available.

+ Details

Name:	ifrs-full_DisclosureOfDefinedBenefitPlansAbstract
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration