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UNCONSOLIDATED STRUCTURED ENTITIES (Details) - COP ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Disclosure of unconsolidated structured entities [line items]    
Percentage of total assets 2.08% 2.05%
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 $ 6,279,287 $ 6,059,447
Grupo Aval's maximum exposure 6,279,287 6,059,447
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 6,247,125 6,029,585
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 32,162 29,862
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 3,711,655 4,457,150
Grupo Aval's maximum exposure 3,711,655 4,457,150
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 3,680,026 4,427,288
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 31,629 29,862
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 2,567,632 1,602,297
Grupo Aval's maximum exposure 2,567,632 1,602,297
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 2,567,099 $ 1,602,297
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 $ 533