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ESTIMATION OF FAIR VALUE - Fair value of financial assets recognized at amortized cost (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    
Financial assets at amortised cost, category [member] | Loan portfolio and investments in debt securities at amortised cost [member]        
Disclosure of financial assets [line items]        
Financial assets 200,819,178 186,147,734    
Financial assets at fair value 199,972,606 200,356,532    
Financial assets at amortised cost, category [member] | Investment securities at amortised cost [member]        
Disclosure of financial assets [line items]        
Financial assets 10,689,692 9,979,679    
Financial assets at fair value 10,715,384 9,981,183    
Financial assets at amortised cost, category [member] | Loan portfolio [member]        
Disclosure of financial assets [line items]        
Financial assets 190,129,486 176,168,055    
Financial assets at fair value 189,257,222 190,375,349    
Financial assets at amortised cost, category [member] | Loan portfolio [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
Debt securities [member] | Gross carrying amount [member]        
Disclosure of financial assets [line items]        
Financial assets $ 49,697,404 $ 40,438,606