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RISK MANAGEMENT - Concentrations of credit risk - Concentration by sector (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
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 $ 84,358,141 $ 84,466,684    
Concentration risk, percentage, financial assets (as a percent) 45.30% 44.80%    
Loan portfolio [member] | Financial assets at amortised cost, category [member] | Gross carrying amount [member] | Commercial services        
Disclosure of financial assets [line items]        
Financial assets $ 40,341,863 $ 42,542,019    
Concentration risk, percentage, financial assets (as a percent) 21.70% 22.60%    
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 $ 14,733,390 $ 14,438,349    
Concentration risk, percentage, financial assets (as a percent) 7.90% 7.70%    
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 $ 7,191,477 $ 7,843,322    
Concentration risk, percentage, financial assets (as a percent) 3.90% 4.20%    
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 $ 6,410,022 $ 7,006,245    
Concentration risk, percentage, financial assets (as a percent) 3.40% 3.70%    
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 $ 6,283,172 $ 6,567,477    
Concentration risk, percentage, financial assets (as a percent) 3.40% 3.50%    
Loan portfolio [member] | Financial assets at amortised cost, category [member] | Gross carrying amount [member] | Public services        
Disclosure of financial assets [line items]        
Financial assets $ 7,172,123 $ 5,672,379    
Concentration risk, percentage, financial assets (as a percent) 3.90% 3.00%    
Loan portfolio [member] | Financial assets at amortised cost, category [member] | Gross carrying amount [member] | Chemical production        
Disclosure of financial assets [line items]        
Financial assets $ 5,414,605 $ 5,422,364    
Concentration risk, percentage, financial assets (as a percent) 2.90% 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 $ 5,367,471 $ 5,252,429    
Concentration risk, percentage, financial assets (as a percent) 2.90% 2.80%    
Loan portfolio [member] | Financial assets at amortised cost, category [member] | Gross carrying amount [member] | Agricultural        
Disclosure of financial assets [line items]        
Financial assets $ 4,192,847 $ 4,448,738    
Concentration risk, percentage, financial assets (as a percent) 2.30% 2.40%    
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 $ 1,622,212 $ 1,650,721    
Concentration risk, percentage, financial assets (as a percent) 0.80% 0.90%    
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 $ 1,500,686 $ 1,226,418    
Concentration risk, percentage, financial assets (as a percent) 0.80% 0.60%    
Loan portfolio [member] | Financial assets at amortised cost, category [member] | Gross carrying amount [member] | Other [member]        
Disclosure of financial assets [line items]        
Financial assets $ 1,615,761 $ 1,776,216    
Concentration risk, percentage, financial assets (as a percent) 0.80% 0.90%