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TRADING ASSETS AND LIABILITIES - Trading assets (Details) - COP ($)
$ in Millions
Dec. 31, 2023
Dec. 31, 2022
Disclosure of financial assets [line items]    
Financial assets $ 280,746,878 $ 274,682,875
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
Trading securities [member]    
Disclosure of financial assets [line items]    
Financial assets 15,451,121 11,841,407
Trading securities [member] | Financial assets at fair value through profit or loss, classified as held for trading, category, International Financial Reporting Standards 9 [member]    
Disclosure of financial assets [line items]    
Financial assets 15,451,121 11,841,407
Debt securities [member] | Trading securities [member]    
Disclosure of financial assets [line items]    
Financial assets 7,113,380 3,760,887
Debt securities [member] | Trading securities [member] | Financial assets at fair value through profit or loss, classified as held for trading, category, International Financial Reporting Standards 9 [member]    
Disclosure of financial assets [line items]    
Financial assets 7,113,380 3,760,887
Equity financial instruments | Trading securities [member]    
Disclosure of financial assets [line items]    
Financial assets 6,260,174 6,039,115
Equity financial instruments | Trading securities [member] | Financial assets at fair value through profit or loss, classified as held for trading, category, International Financial Reporting Standards 9 [member]    
Disclosure of financial assets [line items]    
Financial assets 6,260,174 6,039,115
Derivatives [member]    
Disclosure of financial assets [line items]    
Financial assets 2,126,229 2,062,259
Derivatives [member] | Trading securities [member]    
Disclosure of financial assets [line items]    
Financial assets 2,077,567 2,041,405
Derivatives [member] | Trading securities [member] | Financial assets at fair value through profit or loss, classified as held for trading, category, International Financial Reporting Standards 9 [member]    
Disclosure of financial assets [line items]    
Financial assets $ 2,077,567 $ 2,041,405