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UNCONSOLIDATED STRUCTURED ENTITIES (Details) - COP ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Oct. 29, 2024
Disclosure of unconsolidated structured entities [line items]      
Percentage of total assets 2.22% 2.08%  
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 $ 7,274,925 $ 6,279,287  
Grupo Aval's maximum exposure 7,274,925 6,279,287  
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 7,238,240 6,247,125  
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 36,685 32,162  
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 4,174,965 3,711,655  
Grupo Aval's maximum exposure 4,174,965 3,711,655  
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 4,138,387 3,680,026  
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 36,578 31,629  
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 3,099,960 2,567,632  
Grupo Aval's maximum exposure 3,099,960 2,567,632  
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 3,099,853 2,567,099  
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 $ 533