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CLASSIFICATION OF FINANCIAL ASSETS AND FINANCIAL LIABILITIES - Financial liabilities (Details) - COP ($)
$ in Millions
Dec. 31, 2024
Dec. 31, 2023
Disclosure of financial liabilities [line items]    
Financial liabilities $ 274,729,544 $ 249,900,662
Financial liabilities at fair value through profit or loss, category [member]    
Disclosure of financial liabilities [line items]    
Financial liabilities 1,033,592 2,371,927
Financial liabilities at amortised cost, category [member]    
Disclosure of financial liabilities [line items]    
Financial liabilities 273,695,952 247,528,735
Trading derivatives [member] | Financial liabilities at fair value through profit or loss, classified as held for trading, category [member]    
Disclosure of financial liabilities [line items]    
Financial liabilities 1,011,934 2,154,361
Customer deposits [member]    
Disclosure of financial liabilities [line items]    
Financial liabilities 200,872,177 181,987,396
Customer deposits [member] | Financial liabilities at amortised cost, category [member]    
Disclosure of financial liabilities [line items]    
Financial liabilities 200,872,177 181,987,396
Financial obligations [member]    
Disclosure of financial liabilities [line items]    
Financial liabilities 72,823,775 65,541,339
Financial obligations [member] | Financial liabilities at amortised cost, category [member]    
Disclosure of financial liabilities [line items]    
Financial liabilities 72,823,775 65,541,339
Derivatives [member] | Trading derivatives [member]    
Disclosure of financial liabilities [line items]    
Financial liabilities 1,011,934 2,154,361
Derivatives [member] | Trading derivatives [member] | Financial liabilities at fair value through profit or loss, classified as held for trading, category [member]    
Disclosure of financial liabilities [line items]    
Financial liabilities 1,011,934 2,154,361
Derivatives [member] | Hedging instruments [member]    
Disclosure of financial liabilities [line items]    
Financial liabilities 21,658 217,566
Derivatives [member] | Hedging instruments [member] | Financial liabilities at fair value through profit or loss, mandatorily measured at fair value, category [member]    
Disclosure of financial liabilities [line items]    
Financial liabilities $ 21,658 $ 217,566