v3.26.1
UNCONSOLIDATED STRUCTURED ENTITIES (Details) - COP ($)
$ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Oct. 29, 2024
Disclosure of unconsolidated structured entities [line items]      
Percentage of total assets 2.67% 2.22%  
Total for all unconsolidated structured entities [member]      
Disclosure of unconsolidated structured entities [line items]      
Total assets in relation to the Grupo Aval's interests in the unconsolidated structured entities $ 9,329,341 $ 7,274,925  
Grupo Aval's maximum exposure 9,329,341 7,274,925  
Total for all unconsolidated structured entities [member] | Financial assets at fair value through profit or loss, category [member] | Investment securities at fair value [member]      
Disclosure of unconsolidated structured entities [line items]      
Total assets in relation to the Grupo Aval's interests in the unconsolidated structured entities 9,282,442 7,238,240  
Total for all unconsolidated structured entities [member] | Financial assets at amortised cost, category [member] | Other accounts receivable at amortized cost [member]      
Disclosure of unconsolidated structured entities [line items]      
Total assets in relation to the Grupo Aval's interests in the unconsolidated structured entities 46,899 36,685  
Managed funds [member]      
Disclosure of unconsolidated structured entities [line items]      
Total assets in relation to the Grupo Aval's interests in the unconsolidated structured entities 5,243,139 4,174,965  
Grupo Aval's maximum exposure 5,243,139 4,174,965  
Managed funds [member] | Financial assets at fair value through profit or loss, category [member] | Investment securities at fair value [member]      
Disclosure of unconsolidated structured entities [line items]      
Total assets in relation to the Grupo Aval's interests in the unconsolidated structured entities 5,196,240 4,138,387  
Managed funds [member] | Financial assets at amortised cost, category [member] | Other accounts receivable at amortized cost [member]      
Disclosure of unconsolidated structured entities [line items]      
Total assets in relation to the Grupo Aval's interests in the unconsolidated structured entities 46,899 36,578  
Funds managed by other entities [member]      
Disclosure of unconsolidated structured entities [line items]      
Total assets in relation to the Grupo Aval's interests in the unconsolidated structured entities 4,086,202 3,099,960  
Grupo Aval's maximum exposure 4,086,202 3,099,960  
Funds managed by other entities [member] | Financial assets at fair value through profit or loss, category [member] | Investment securities at fair value [member]      
Disclosure of unconsolidated structured entities [line items]      
Total assets in relation to the Grupo Aval's interests in the unconsolidated structured entities $ 4,086,202 3,099,853  
Funds managed by other entities [member] | Financial assets at fair value through profit or loss, category [member] | Private equity fund Pactia Inmobiliario [member]      
Disclosure of unconsolidated structured entities [line items]      
Total assets in relation to the Grupo Aval's interests in the unconsolidated structured entities     $ 324,220
Funds managed by other entities [member] | Financial assets at amortised cost, category [member] | Other accounts receivable at amortized cost [member]      
Disclosure of unconsolidated structured entities [line items]      
Total assets in relation to the Grupo Aval's interests in the unconsolidated structured entities   $ 107