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ESTIMATION OF FAIR VALUE - Trading assets in debt securities pledged as collateral (Details) - Financial assets at fair value through profit or loss, classified as held for trading, category, International Financial Reporting Standards 9 [member] - COP ($)
$ in Millions
Dec. 31, 2024
Dec. 31, 2023
Debt securities [member]    
Disclosure of financial assets [line items]    
Financial assets pledged as collateral $ 6,452,275 $ 2,853,286
Pledged in money market operations | Debt securities [member]    
Disclosure of financial assets [line items]    
Financial assets pledged as collateral 5,272,055 2,774,296
Pledged in money market operations | Securities issued or secured by Colombian Government    
Disclosure of financial assets [line items]    
Financial assets pledged as collateral 5,270,000 2,702,953
Pledged in money market operations | Securities issued or secured by other financial entities    
Disclosure of financial assets [line items]    
Financial assets pledged as collateral 2,055 71,343
Pledged as collateral to special entities such as CRCC, BR and BVC | Debt securities [member]    
Disclosure of financial assets [line items]    
Financial assets pledged as collateral 1,179,027 78,990
Pledged as collateral to special entities such as CRCC, BR and BVC | Securities issued or secured by Colombian Government    
Disclosure of financial assets [line items]    
Financial assets pledged as collateral 1,179,027 78,990
Pledged as collateral in operations with derivative instruments | Debt securities [member]    
Disclosure of financial assets [line items]    
Financial assets pledged as collateral 1,193  
Pledged as collateral in operations with derivative instruments | Securities issued or secured by Colombian Government    
Disclosure of financial assets [line items]    
Financial assets pledged as collateral 1,193  
Level 1 of fair value hierarchy [member] | Debt securities [member]    
Disclosure of financial assets [line items]    
Financial assets pledged as collateral 6,450,220 2,781,943
Level 1 of fair value hierarchy [member] | Pledged in money market operations | Debt securities [member]    
Disclosure of financial assets [line items]    
Financial assets pledged as collateral 5,270,000 2,702,953
Level 1 of fair value hierarchy [member] | Pledged in money market operations | Securities issued or secured by Colombian Government    
Disclosure of financial assets [line items]    
Financial assets pledged as collateral 5,270,000 2,702,953
Level 1 of fair value hierarchy [member] | Pledged as collateral to special entities such as CRCC, BR and BVC | Debt securities [member]    
Disclosure of financial assets [line items]    
Financial assets pledged as collateral 1,179,027 78,990
Level 1 of fair value hierarchy [member] | Pledged as collateral to special entities such as CRCC, BR and BVC | Securities issued or secured by Colombian Government    
Disclosure of financial assets [line items]    
Financial assets pledged as collateral 1,179,027 78,990
Level 1 of fair value hierarchy [member] | Pledged as collateral in operations with derivative instruments | Debt securities [member]    
Disclosure of financial assets [line items]    
Financial assets pledged as collateral 1,193  
Level 1 of fair value hierarchy [member] | Pledged as collateral in operations with derivative instruments | Securities issued or secured by Colombian Government    
Disclosure of financial assets [line items]    
Financial assets pledged as collateral 1,193  
Level 2 of fair value hierarchy [member] | Debt securities [member]    
Disclosure of financial assets [line items]    
Financial assets pledged as collateral 2,055 71,343
Level 2 of fair value hierarchy [member] | Pledged in money market operations | Debt securities [member]    
Disclosure of financial assets [line items]    
Financial assets pledged as collateral 2,055 71,343
Level 2 of fair value hierarchy [member] | Pledged in money market operations | Securities issued or secured by other financial entities    
Disclosure of financial assets [line items]    
Financial assets pledged as collateral $ 2,055 $ 71,343