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RISK MANAGEMENT - Trading book risk - Liabilities (Details) - COP ($)
$ in Millions
Dec. 31, 2023
Dec. 31, 2022
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Financial liabilities $ 249,900,662 $ 247,219,098
Market risk [member]    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Financial liabilities 2,371,927 1,761,174
Financial liabilities at fair value through profit or loss, category [member]    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Financial liabilities 2,371,927 1,761,174
Trading derivatives [member] | Financial liabilities at fair value through profit or loss, classified as held for trading, category [member]    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Financial liabilities 2,154,361 1,757,606
Derivatives [member] | Hedging instruments [member]    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Financial liabilities 217,566 3,568
Derivatives [member] | Hedging instruments [member] | Financial liabilities at fair value through profit or loss, mandatorily measured at fair value, category [member]    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Financial liabilities 217,566 3,568
Derivatives [member] | Hedging instruments [member] | Financial liabilities at fair value through profit or loss, mandatorily measured at fair value, category [member] | Market risk [member]    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Financial liabilities 217,566 3,568
Derivatives [member] | Trading derivatives [member]    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Financial liabilities 2,154,361 1,757,606
Derivatives [member] | Trading derivatives [member] | Financial liabilities at fair value through profit or loss, classified as held for trading, category [member]    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Financial liabilities 2,154,361 1,757,606
Derivatives [member] | Trading derivatives [member] | Financial liabilities at fair value through profit or loss, classified as held for trading, category [member] | Market risk [member]    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Financial liabilities $ 2,154,361 $ 1,757,606