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INVESTMENT SECURITIES - Balances of investment securities (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    
Accumulated impairment [member]        
Disclosure of financial assets [line items]        
Financial assets (10,478,009) (10,521,501)    
Financial assets at fair value through profit or loss, category [member]        
Disclosure of financial assets [line items]        
Financial assets 24,400,493 19,332,588    
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] | Accumulated impairment [member]        
Disclosure of financial assets [line items]        
Financial assets (10,387,285) (10,438,261)    
Financial assets measured at fair value through other comprehensive income, category [member]        
Disclosure of financial assets [line items]        
Financial assets 27,050,198 23,326,776    
Investments in equity instruments designated at fair value through other comprehensive income [member]        
Disclosure of financial assets [line items]        
Financial assets 1,421,303 1,117,349    
Investment securities [member]        
Disclosure of financial assets [line items]        
Financial assets 39,162,618 34,425,693    
Investment securities [member] | Gross carrying amount [member]        
Disclosure of financial assets [line items]        
Financial assets 39,181,293 34,442,575    
Investment securities [member] | Financial assets at amortised cost, category [member] | Gross carrying amount [member]        
Disclosure of financial assets [line items]        
Financial assets 10,708,367 9,996,561    
Investment securities at fair value [member]        
Disclosure of financial assets [line items]        
Financial assets 28,472,926 24,446,014    
Debt securities [member] | Gross carrying amount [member]        
Disclosure of financial assets [line items]        
Financial assets 49,697,404 40,438,606    
Debt securities [member] | Financial assets at amortised cost, category [member] | Accumulated impairment [member]        
Disclosure of financial assets [line items]        
Financial assets (18,675) (16,882) $ (36,930) $ (10,698)
Debt securities [member] | Investment securities [member] | Financial assets at fair value through profit or loss, mandatorily measured at fair value, category [member]        
Disclosure of financial assets [line items]        
Financial assets 1,425 1,889    
Debt securities [member] | Investment securities [member] | Financial assets at amortised cost, category [member] | Gross carrying amount [member]        
Disclosure of financial assets [line items]        
Financial assets 10,708,367 9,996,561    
Debt securities [member] | Investment securities [member] | Financial assets at amortised cost, category [member] | Accumulated impairment [member]        
Disclosure of financial assets [line items]        
Financial assets (18,675) (16,882)    
Debt securities [member] | Investment securities [member] | Financial assets measured at fair value through other comprehensive income, category [member]        
Disclosure of financial assets [line items]        
Financial assets 27,050,198 23,326,776    
Debt securities [member] | Investment securities at fair value [member] | Financial assets at fair value through profit or loss, mandatorily measured at fair value, category [member]        
Disclosure of financial assets [line items]        
Financial assets 1,425 1,889    
Debt securities [member] | Investment securities at fair value [member] | Financial assets measured at fair value through other comprehensive income, category [member]        
Disclosure of financial assets [line items]        
Financial assets 27,050,198 23,326,776    
Debt securities [member] | Investment securities at fair value [member] | Financial assets measured at fair value through other comprehensive income, category [member] | Gross carrying amount [member]        
Disclosure of financial assets [line items]        
Financial assets 27,050,198 23,326,776    
Debt securities [member] | Investment securities at fair value [member] | Financial assets measured at fair value through other comprehensive income, category [member] | Accumulated impairment [member]        
Disclosure of financial assets [line items]        
Financial assets (18,310) (12,972) $ (12,686) $ (123,978)
Equity investments [member] | Investment securities [member] | Investments in equity instruments designated at fair value through other comprehensive income [member]        
Disclosure of financial assets [line items]        
Financial assets 1,421,303 1,117,349    
Equity investments [member] | Investment securities at fair value [member] | Investments in equity instruments designated at fair value through other comprehensive income [member]        
Disclosure of financial assets [line items]        
Financial assets $ 1,421,303 $ 1,117,349