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REPORTING ENTITY - Textual (Details)
 12 Months Ended
Dec. 31, 2024
Banco de Bogota S.A.  
Disclosure of subsidiaries [line items]  
Proportion of voting rights held in subsidiary 68.93%
Proportion of ownership interest in subsidiary 68.93%
Banco de Occidente S.A.  
Disclosure of subsidiaries [line items]  
Proportion of voting rights held in subsidiary 72.27%
Proportion of ownership interest in subsidiary 72.27%
Banco Popular S.A.  
Disclosure of subsidiaries [line items]  
Proportion of voting rights held in subsidiary 93.74%
Proportion of ownership interest in subsidiary 93.74%
Banco Comercial AV Villas S.A.  
Disclosure of subsidiaries [line items]  
Proportion of voting rights held in subsidiary 80.39%
Proportion of ownership interest in subsidiary 79.87%
Corporacion Financiera Colombiana S.A.  
Disclosure of subsidiaries [line items]  
Proportion of voting rights held in subsidiary 55.73%
Proportion of ownership interest in subsidiary 40.53%
Sociedad Administradora de Fondos de Pensiones y Cesantias Porvenir S.A.  
Disclosure of subsidiaries [line items]  
Proportion of voting rights held in subsidiary 100.00%
Proportion of ownership interest in subsidiary 75.76%
Grupo Aval Limited  
Disclosure of subsidiaries [line items]  
Proportion of ownership interest in subsidiary 100.00%
Aval Fiduciaria S.A  
Disclosure of subsidiaries [line items]  
Proportion of voting rights held in subsidiary 100.00%
Proportion of ownership interest in subsidiary 96.73%
Aval Casa de Bolsa S.A  
Disclosure of subsidiaries [line items]  
Proportion of voting rights held in subsidiary 97.30%
Proportion of ownership interest in subsidiary 86.40%