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ESTIMATION OF FAIR VALUE - Fair value of financial assets recognized at amortized cost (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    
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 186,147,734 188,850,409    
Financial assets at fair value 200,356,532 189,864,007    
Financial assets at amortised cost, category [member] | Investment securities at amortised cost [member]        
Disclosure of financial assets [line items]        
Financial assets 9,979,679 9,734,562    
Financial assets at fair value 9,981,183 9,744,533    
Financial assets at amortised cost, category [member] | Loan portfolio [member]        
Disclosure of financial assets [line items]        
Financial assets 176,168,055 179,115,847    
Financial assets at fair value 190,375,349 180,119,474    
Financial assets at amortised cost, category [member] | Loan portfolio [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
Debt securities [member] | Gross carrying amount [member]        
Disclosure of financial assets [line items]        
Financial assets $ 40,438,606 $ 35,995,562