EQUITY ATTRIBUTABLE TO OWNERS OF THE PARENT - Legal reserve (Details)	12 Months Ended
Dec. 31, 2021
Disclosure of classes of share capital [abstract]
Legal reserve as percentage of net profit	10.00%
Maximum legal reserve as percentage of subscription capital stock	50.00%
Maximum legal reserve as percentage of subscription capital stock, reduced to stem losses in excess of retained earnings	50.00%

Maximum legal reserve as percentage of subscription capital stock, reduced to stem losses in excess of retained earnings

No definition available.

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