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RISK MANAGEMENT - Concentrations of credit risk - Concentration by country (Details) - COP ($)
$ in Millions
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Disclosure of financial assets [line items]        
Financial assets $ 304,853,883 $ 280,746,878    
Financial assets at amortised cost, category [member]        
Disclosure of financial assets [line items]        
Financial assets 251,981,889 236,970,165    
Loan portfolio [member] | Financial assets at amortised cost, category [member]        
Disclosure of financial assets [line items]        
Financial assets 190,129,486 176,168,055    
Loan portfolio [member] | Financial assets at amortised cost, category [member] | Gross carrying amount [member]        
Disclosure of financial assets [line items]        
Financial assets 200,136,125 186,203,770 $ 188,313,361 $ 231,573,437
Loan portfolio [member] | Financial assets at amortised cost, category [member] | Gross carrying amount [member] | COLOMBIA        
Disclosure of financial assets [line items]        
Financial assets 172,225,134 162,767,987    
Loan portfolio [member] | Financial assets at amortised cost, category [member] | Gross carrying amount [member] | PANAMA        
Disclosure of financial assets [line items]        
Financial assets 17,458,657 14,364,809    
Loan portfolio [member] | Financial assets at amortised cost, category [member] | Gross carrying amount [member] | COSTA RICA        
Disclosure of financial assets [line items]        
Financial assets 127,701 116,474    
Loan portfolio [member] | Financial assets at amortised cost, category [member] | Gross carrying amount [member] | GUATEMALA        
Disclosure of financial assets [line items]        
Financial assets 432,151 218,838    
Loan portfolio [member] | Financial assets at amortised cost, category [member] | Gross carrying amount [member] | UNITED STATES        
Disclosure of financial assets [line items]        
Financial assets 6,787,025 5,907,129    
Loan portfolio [member] | Financial assets at amortised cost, category [member] | Gross carrying amount [member] | HONDURAS        
Disclosure of financial assets [line items]        
Financial assets 392,236 298,941    
Loan portfolio [member] | Financial assets at amortised cost, category [member] | Gross carrying amount [member] | EL SALVADOR        
Disclosure of financial assets [line items]        
Financial assets 13,919 6,704    
Loan portfolio [member] | Financial assets at amortised cost, category [member] | Gross carrying amount [member] | NICARAGUA        
Disclosure of financial assets [line items]        
Financial assets 412 605    
Loan portfolio [member] | Financial assets at amortised cost, category [member] | Gross carrying amount [member] | Other countries        
Disclosure of financial assets [line items]        
Financial assets 2,698,890 2,522,283    
Loans to corporate entities [member] | Financial assets at amortised cost, category [member]        
Disclosure of financial assets [line items]        
Financial assets 110,756,010 102,145,802    
Loans to corporate entities [member] | Financial assets at amortised cost, category [member] | Gross carrying amount [member]        
Disclosure of financial assets [line items]        
Financial assets 116,119,698 107,440,424    
Commercial lending portfolio [member] | Financial assets at amortised cost, category [member]        
Disclosure of financial assets [line items]        
Financial assets 110,051,750 101,753,217    
Commercial lending portfolio [member] | Financial assets at amortised cost, category [member] | Gross carrying amount [member]        
Disclosure of financial assets [line items]        
Financial assets 115,414,643 107,047,817 104,775,099 122,027,804
Commercial lending portfolio [member] | Financial assets at amortised cost, category [member] | Gross carrying amount [member] | COLOMBIA        
Disclosure of financial assets [line items]        
Financial assets 95,610,708 90,146,557    
Commercial lending portfolio [member] | Financial assets at amortised cost, category [member] | Gross carrying amount [member] | PANAMA        
Disclosure of financial assets [line items]        
Financial assets 9,455,147 7,881,116    
Commercial lending portfolio [member] | Financial assets at amortised cost, category [member] | Gross carrying amount [member] | COSTA RICA        
Disclosure of financial assets [line items]        
Financial assets 125,689 115,868    
Commercial lending portfolio [member] | Financial assets at amortised cost, category [member] | Gross carrying amount [member] | GUATEMALA        
Disclosure of financial assets [line items]        
Financial assets 432,151 218,838    
Commercial lending portfolio [member] | Financial assets at amortised cost, category [member] | Gross carrying amount [member] | UNITED STATES        
Disclosure of financial assets [line items]        
Financial assets 6,685,567 5,857,040    
Commercial lending portfolio [member] | Financial assets at amortised cost, category [member] | Gross carrying amount [member] | HONDURAS        
Disclosure of financial assets [line items]        
Financial assets 392,236 298,941    
Commercial lending portfolio [member] | Financial assets at amortised cost, category [member] | Gross carrying amount [member] | EL SALVADOR        
Disclosure of financial assets [line items]        
Financial assets 13,919 6,704    
Commercial lending portfolio [member] | Financial assets at amortised cost, category [member] | Gross carrying amount [member] | NICARAGUA        
Disclosure of financial assets [line items]        
Financial assets 412 605    
Commercial lending portfolio [member] | Financial assets at amortised cost, category [member] | Gross carrying amount [member] | Other countries        
Disclosure of financial assets [line items]        
Financial assets 2,698,814 2,522,148    
Interbank and overnight funds [member] | Financial assets at amortised cost, category [member]        
Disclosure of financial assets [line items]        
Financial assets 704,260 392,585    
Interbank and overnight funds [member] | Financial assets at amortised cost, category [member] | Gross carrying amount [member]        
Disclosure of financial assets [line items]        
Financial assets 705,055 392,607 5,967,743 3,218,433
Interbank and overnight funds [member] | Financial assets at amortised cost, category [member] | Gross carrying amount [member] | COLOMBIA        
Disclosure of financial assets [line items]        
Financial assets 395,382 320,400    
Interbank and overnight funds [member] | Financial assets at amortised cost, category [member] | Gross carrying amount [member] | PANAMA        
Disclosure of financial assets [line items]        
Financial assets 214,187 21,512    
Interbank and overnight funds [member] | Financial assets at amortised cost, category [member] | Gross carrying amount [member] | COSTA RICA        
Disclosure of financial assets [line items]        
Financial assets 2,012 606    
Interbank and overnight funds [member] | Financial assets at amortised cost, category [member] | Gross carrying amount [member] | UNITED STATES        
Disclosure of financial assets [line items]        
Financial assets 93,474 50,089    
Loans to consumers [member] | Financial assets at amortised cost, category [member]        
Disclosure of financial assets [line items]        
Financial assets 57,810,307 55,692,165    
Loans to consumers [member] | Financial assets at amortised cost, category [member] | Gross carrying amount [member]        
Disclosure of financial assets [line items]        
Financial assets 61,976,325 59,999,611 59,419,444 76,889,145
Loans to consumers [member] | Financial assets at amortised cost, category [member] | Gross carrying amount [member] | COLOMBIA        
Disclosure of financial assets [line items]        
Financial assets 57,719,813 56,659,813    
Loans to consumers [member] | Financial assets at amortised cost, category [member] | Gross carrying amount [member] | PANAMA        
Disclosure of financial assets [line items]        
Financial assets 4,248,452 3,339,663    
Loans to consumers [member] | Financial assets at amortised cost, category [member] | Gross carrying amount [member] | UNITED STATES        
Disclosure of financial assets [line items]        
Financial assets 7,984      
Loans to consumers [member] | Financial assets at amortised cost, category [member] | Gross carrying amount [member] | Other countries        
Disclosure of financial assets [line items]        
Financial assets 76 135    
Mortgages [member] | Financial assets at amortised cost, category [member]        
Disclosure of financial assets [line items]        
Financial assets 21,562,412 18,106,219    
Mortgages [member] | Financial assets at amortised cost, category [member] | Gross carrying amount [member]        
Disclosure of financial assets [line items]        
Financial assets 22,035,727 18,486,206 17,883,355 29,120,316
Mortgages [member] | Financial assets at amortised cost, category [member] | Gross carrying amount [member] | COLOMBIA        
Disclosure of financial assets [line items]        
Financial assets 18,494,856 15,363,688    
Mortgages [member] | Financial assets at amortised cost, category [member] | Gross carrying amount [member] | PANAMA        
Disclosure of financial assets [line items]        
Financial assets 3,540,871 3,122,518    
Microcredit [member] | Financial assets at amortised cost, category [member]        
Disclosure of financial assets [line items]        
Financial assets 757 223,869    
Microcredit [member] | Financial assets at amortised cost, category [member] | Gross carrying amount [member]        
Disclosure of financial assets [line items]        
Financial assets 4,375 277,529 $ 267,720 $ 317,739
Microcredit [member] | Financial assets at amortised cost, category [member] | Gross carrying amount [member] | COLOMBIA        
Disclosure of financial assets [line items]        
Financial assets $ 4,375 $ 277,529