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RISK MANAGEMENT - Concentrations of credit risk - Concentration by country (Details) - COP ($)
$ in Millions
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Disclosure of financial assets [line items]        
Financial assets $ 280,746,878 $ 274,682,875    
Financial assets at amortised cost, category [member]        
Disclosure of financial assets [line items]        
Financial assets 236,970,165 235,373,468    
Loan portfolio [member] | Financial assets at amortised cost, category [member]        
Disclosure of financial assets [line items]        
Financial assets 176,168,055 179,115,847    
Loan portfolio [member] | Financial assets at amortised cost, category [member] | Gross carrying amount [member]        
Disclosure of financial assets [line items]        
Financial assets 186,203,770 188,313,361 $ 231,573,437 $ 206,447,165
Loan portfolio [member] | Financial assets at amortised cost, category [member] | Gross carrying amount [member] | Colombia        
Disclosure of financial assets [line items]        
Financial assets 162,767,987 161,501,401    
Loan portfolio [member] | Financial assets at amortised cost, category [member] | Gross carrying amount [member] | Panama        
Disclosure of financial assets [line items]        
Financial assets 14,364,809 18,462,789    
Loan portfolio [member] | Financial assets at amortised cost, category [member] | Gross carrying amount [member] | Costa Rica        
Disclosure of financial assets [line items]        
Financial assets 116,474 219,877    
Loan portfolio [member] | Financial assets at amortised cost, category [member] | Gross carrying amount [member] | Guatemala        
Disclosure of financial assets [line items]        
Financial assets 218,838 225,105    
Loan portfolio [member] | Financial assets at amortised cost, category [member] | Gross carrying amount [member] | United States        
Disclosure of financial assets [line items]        
Financial assets 5,907,129 5,063,374    
Loan portfolio [member] | Financial assets at amortised cost, category [member] | Gross carrying amount [member] | Honduras        
Disclosure of financial assets [line items]        
Financial assets 298,941 77,035    
Loan portfolio [member] | Financial assets at amortised cost, category [member] | Gross carrying amount [member] | El Salvador        
Disclosure of financial assets [line items]        
Financial assets 6,704 56,066    
Loan portfolio [member] | Financial assets at amortised cost, category [member] | Gross carrying amount [member] | Nicaragua        
Disclosure of financial assets [line items]        
Financial assets 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 2,522,283 2,707,714    
Loans to corporate entities [member] | Financial assets at amortised cost, category [member]        
Disclosure of financial assets [line items]        
Financial assets 102,145,802 105,248,652    
Loans to corporate entities [member] | Financial assets at amortised cost, category [member] | Gross carrying amount [member]        
Disclosure of financial assets [line items]        
Financial assets 107,440,424 110,742,842    
Commercial lending portfolio [member] | Financial assets at amortised cost, category [member]        
Disclosure of financial assets [line items]        
Financial assets 101,753,217 99,282,353    
Commercial lending portfolio [member] | Financial assets at amortised cost, category [member] | Gross carrying amount [member]        
Disclosure of financial assets [line items]        
Financial assets 107,047,817 104,775,099 122,027,804 110,986,938
Commercial lending portfolio [member] | Financial assets at amortised cost, category [member] | Gross carrying amount [member] | Colombia        
Disclosure of financial assets [line items]        
Financial assets 90,146,557 86,114,887    
Commercial lending portfolio [member] | Financial assets at amortised cost, category [member] | Gross carrying amount [member] | Panama        
Disclosure of financial assets [line items]        
Financial assets 7,881,116 10,318,304    
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 115,868 212,701    
Commercial lending portfolio [member] | Financial assets at amortised cost, category [member] | Gross carrying amount [member] | Guatemala        
Disclosure of financial assets [line items]        
Financial assets 218,838 225,105    
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 5,857,040 5,063,368    
Commercial lending portfolio [member] | Financial assets at amortised cost, category [member] | Gross carrying amount [member] | Honduras        
Disclosure of financial assets [line items]        
Financial assets 298,941 77,035    
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 6,704 56,066    
Commercial lending portfolio [member] | Financial assets at amortised cost, category [member] | Gross carrying amount [member] | Nicaragua        
Disclosure of financial assets [line items]        
Financial assets 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 2,522,148 2,707,633    
Interbank and overnight funds [member] | Financial assets at amortised cost, category [member]        
Disclosure of financial assets [line items]        
Financial assets 392,585 5,966,299    
Interbank and overnight funds [member] | Financial assets at amortised cost, category [member] | Gross carrying amount [member]        
Disclosure of financial assets [line items]        
Financial assets 392,607 5,967,743 3,218,433 4,693,678
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 320,400 5,786,796    
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 21,512 177,090    
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 606 3,857    
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 50,089      
Loans to consumers [member] | Financial assets at amortised cost, category [member]        
Disclosure of financial assets [line items]        
Financial assets 55,692,165 56,107,532    
Loans to consumers [member] | Financial assets at amortised cost, category [member] | Gross carrying amount [member]        
Disclosure of financial assets [line items]        
Financial assets 59,999,611 59,419,444 76,889,145 65,835,457
Loans to consumers [member] | Financial assets at amortised cost, category [member] | Gross carrying amount [member] | Colombia        
Disclosure of financial assets [line items]        
Financial assets 56,659,813 55,387,762    
Loans to consumers [member] | Financial assets at amortised cost, category [member] | Gross carrying amount [member] | Panama        
Disclosure of financial assets [line items]        
Financial assets 3,339,663 4,030,766    
Loans to consumers [member] | Financial assets at amortised cost, category [member] | Gross carrying amount [member] | Costa Rica        
Disclosure of financial assets [line items]        
Financial assets   829    
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   6    
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 135 81    
Mortgage [member] | Financial assets at amortised cost, category [member]        
Disclosure of financial assets [line items]        
Financial assets 18,106,219 17,530,914    
Mortgage [member] | Financial assets at amortised cost, category [member] | Gross carrying amount [member]        
Disclosure of financial assets [line items]        
Financial assets 18,486,206 17,883,355 29,120,316 24,558,771
Mortgage [member] | Financial assets at amortised cost, category [member] | Gross carrying amount [member] | Colombia        
Disclosure of financial assets [line items]        
Financial assets 15,363,688 13,944,236    
Mortgage [member] | Financial assets at amortised cost, category [member] | Gross carrying amount [member] | Panama        
Disclosure of financial assets [line items]        
Financial assets 3,122,518 3,936,629    
Mortgage [member] | Financial assets at amortised cost, category [member] | Gross carrying amount [member] | Costa Rica        
Disclosure of financial assets [line items]        
Financial assets   2,490    
Microcredit [member] | Financial assets at amortised cost, category [member]        
Disclosure of financial assets [line items]        
Financial assets 223,869 228,749    
Microcredit [member] | Financial assets at amortised cost, category [member] | Gross carrying amount [member]        
Disclosure of financial assets [line items]        
Financial assets 277,529 267,720 $ 317,739 $ 372,321
Microcredit [member] | Financial assets at amortised cost, category [member] | Gross carrying amount [member] | Colombia        
Disclosure of financial assets [line items]        
Financial assets $ 277,529 $ 267,720