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RISK MANAGEMENT - Concentrations of credit risk - Concentration by sector (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
Concentration risk, percentage, financial assets (as a percent) 100.00% 100.00%    
Loan portfolio [member] | Financial assets at amortised cost, category [member] | Gross carrying amount [member] | Consumer services        
Disclosure of financial assets [line items]        
Financial assets $ 89,687,446 $ 84,358,141    
Concentration risk, percentage, financial assets (as a percent) 44.80% 45.30%    
Loan portfolio [member] | Financial assets at amortised cost, category [member] | Gross carrying amount [member] | Commercial services        
Disclosure of financial assets [line items]        
Financial assets $ 43,792,710 $ 40,341,863    
Concentration risk, percentage, financial assets (as a percent) 21.90% 21.70%    
Loan portfolio [member] | Financial assets at amortised cost, category [member] | Gross carrying amount [member] | IFRS Construction [Member]        
Disclosure of financial assets [line items]        
Financial assets $ 15,046,109 $ 14,733,390    
Concentration risk, percentage, financial assets (as a percent) 7.50% 7.90%    
Loan portfolio [member] | Financial assets at amortised cost, category [member] | Gross carrying amount [member] | Food, beverage and tobacco        
Disclosure of financial assets [line items]        
Financial assets $ 7,577,678 $ 7,191,477    
Concentration risk, percentage, financial assets (as a percent) 3.80% 3.90%    
Loan portfolio [member] | Financial assets at amortised cost, category [member] | Gross carrying amount [member] | Other industrial and manufacturing products        
Disclosure of financial assets [line items]        
Financial assets $ 6,857,011 $ 6,410,022    
Concentration risk, percentage, financial assets (as a percent) 3.40% 3.40%    
Loan portfolio [member] | Financial assets at amortised cost, category [member] | Gross carrying amount [member] | Transportation and communications        
Disclosure of financial assets [line items]        
Financial assets $ 6,499,070 $ 6,283,172    
Concentration risk, percentage, financial assets (as a percent) 3.20% 3.40%    
Loan portfolio [member] | Financial assets at amortised cost, category [member] | Gross carrying amount [member] | Public services        
Disclosure of financial assets [line items]        
Financial assets $ 9,218,309 $ 7,172,123    
Concentration risk, percentage, financial assets (as a percent) 4.60% 3.90%    
Loan portfolio [member] | Financial assets at amortised cost, category [member] | Gross carrying amount [member] | Chemical production        
Disclosure of financial assets [line items]        
Financial assets $ 5,539,036 $ 5,414,605    
Concentration risk, percentage, financial assets (as a percent) 2.80% 2.90%    
Loan portfolio [member] | Financial assets at amortised cost, category [member] | Gross carrying amount [member] | Government        
Disclosure of financial assets [line items]        
Financial assets $ 5,471,013 $ 5,367,471    
Concentration risk, percentage, financial assets (as a percent) 2.70% 2.90%    
Loan portfolio [member] | Financial assets at amortised cost, category [member] | Gross carrying amount [member] | Agricultural        
Disclosure of financial assets [line items]        
Financial assets $ 4,538,856 $ 4,192,847    
Concentration risk, percentage, financial assets (as a percent) 2.30% 2.30%    
Loan portfolio [member] | Financial assets at amortised cost, category [member] | Gross carrying amount [member] | Trade and tourism        
Disclosure of financial assets [line items]        
Financial assets $ 1,724,337 $ 1,622,212    
Concentration risk, percentage, financial assets (as a percent) 0.90% 0.80%    
Loan portfolio [member] | Financial assets at amortised cost, category [member] | Gross carrying amount [member] | Mining products and oil        
Disclosure of financial assets [line items]        
Financial assets $ 2,754,170 $ 1,500,686    
Concentration risk, percentage, financial assets (as a percent) 1.40% 0.80%    
Loan portfolio [member] | Financial assets at amortised cost, category [member] | Gross carrying amount [member] | Other [member]        
Disclosure of financial assets [line items]        
Financial assets $ 1,430,380 $ 1,615,761    
Concentration risk, percentage, financial assets (as a percent) 0.70% 0.80%