v3.26.1
REPORTING ENTITY - Textual (Details)
 12 Months Ended
Dec. 31, 2025
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 93.87%
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%
Sociedad Administradora de Fondos de Pensiones, Cesantias y del CCAI 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 98.47%
Aval Casa de Bolsa S.A  
Disclosure of subsidiaries [line items]  
Proportion of voting rights held in subsidiary 98.80%
Proportion of ownership interest in subsidiary 87.84%
Aval Banca de Inversion S.A.S.  
Disclosure of subsidiaries [line items]  
Proportion of voting rights held in subsidiary 100.00%
Proportion of ownership interest in subsidiary 82.16%