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INVESTMENT SECURITIES - Balances of investment securities (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    
Accumulated impairment [member]        
Disclosure of financial assets [line items]        
Financial assets (10,521,501) (9,694,456)    
Financial assets at fair value through profit or loss, category [member]        
Disclosure of financial assets [line items]        
Financial assets 19,332,588 15,370,870    
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] | Accumulated impairment [member]        
Disclosure of financial assets [line items]        
Financial assets (10,438,261) (9,616,860)    
Financial assets measured at fair value through other comprehensive income, category [member]        
Disclosure of financial assets [line items]        
Financial assets 23,326,776 22,461,805    
Investments in equity instruments designated at fair value through other comprehensive income [member]        
Disclosure of financial assets [line items]        
Financial assets 1,117,349 1,476,732    
Investment securities [member]        
Disclosure of financial assets [line items]        
Financial assets 34,425,693 33,674,477    
Investment securities [member] | Gross carrying amount [member]        
Disclosure of financial assets [line items]        
Financial assets 34,442,575 33,711,407    
Investment securities [member] | Financial assets at amortised cost, category [member] | Gross carrying amount [member]        
Disclosure of financial assets [line items]        
Financial assets 9,996,561 9,771,492    
Investment securities at fair value [member]        
Disclosure of financial assets [line items]        
Financial assets 24,446,014 23,939,915    
Debt securities [member] | Gross carrying amount [member]        
Disclosure of financial assets [line items]        
Financial assets 40,438,606 35,995,562    
Debt securities [member] | Financial assets at amortised cost, category [member] | Accumulated impairment [member]        
Disclosure of financial assets [line items]        
Financial assets (16,882) (36,930) $ (10,698) $ (7,195)
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 1,889 1,378    
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 9,996,561 9,771,492    
Debt securities [member] | Investment securities [member] | Financial assets at amortised cost, category [member] | Accumulated impairment [member]        
Disclosure of financial assets [line items]        
Financial assets (16,882) (36,930)    
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 23,326,776 22,461,805    
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 1,889 1,378    
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 23,326,776 22,461,805    
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 23,326,776 22,461,805    
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 (12,972) (12,686) $ (123,978) $ (96,486)
Equity investments | Investment securities [member] | Investments in equity instruments designated at fair value through other comprehensive income [member]        
Disclosure of financial assets [line items]        
Financial assets 1,117,349 1,476,732    
Equity investments | 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 $ 1,117,349 $ 1,476,732