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INVESTMENT SECURITIES - Investment in debt at amortized cost pledged as collateral (Details) - Financial assets at amortised cost, category [member] - COP ($)
$ in Millions
Dec. 31, 2023
Dec. 31, 2022
Debt securities [member]    
Disclosure of financial assets [line items]    
Financial assets pledged as collateral $ 3,208,890 $ 1,379,758
Debt securities [member] | Pledged in money market operations    
Disclosure of financial assets [line items]    
Financial assets pledged as collateral 2,275,917 380,197
Debt securities [member] | Pledged as collateral to special entities such as CRCC, BR and BVC    
Disclosure of financial assets [line items]    
Financial assets pledged as collateral 932,973 999,561
Securities issued or secured by Colombian Government | Pledged in money market operations    
Disclosure of financial assets [line items]    
Financial assets pledged as collateral 489,631  
Securities issued or secured by Colombian Government | Pledged as collateral to special entities such as CRCC, BR and BVC    
Disclosure of financial assets [line items]    
Financial assets pledged as collateral 539,339  
Securities issued or secured by other Colombian Government entities | Pledged in money market operations    
Disclosure of financial assets [line items]    
Financial assets pledged as collateral 1,667,922 118,536
Securities issued or secured by other Colombian Government entities | Pledged as collateral to special entities such as CRCC, BR and BVC    
Disclosure of financial assets [line items]    
Financial assets pledged as collateral 393,634 999,561
Securities issued or secured by other financial entities | Pledged in money market operations    
Disclosure of financial assets [line items]    
Financial assets pledged as collateral   25,449
Securities issued or secured by non-financial sector entities | Pledged in money market operations    
Disclosure of financial assets [line items]    
Financial assets pledged as collateral $ 118,364 $ 236,212