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TRADING ASSETS AND LIABILITIES - Trading derivative liabilities (Details) - COP ($)
$ in Millions
Dec. 31, 2023
Dec. 31, 2022
Disclosure of financial liabilities [line items]    
Derivative liabilities $ 2,154,361 $ 1,757,606
Forward contracts    
Disclosure of financial liabilities [line items]    
Derivative liabilities 1,675,923 891,181
Forward contracts, Foreign currency to buy    
Disclosure of financial liabilities [line items]    
Derivative liabilities 1,543,886 261,614
Forward contracts, Foreign currency to sell    
Disclosure of financial liabilities [line items]    
Derivative liabilities 2,691 624,319
Forward contracts, Debt securities to buy    
Disclosure of financial liabilities [line items]    
Derivative liabilities 589 996
Forward contracts, Debt securities to sell    
Disclosure of financial liabilities [line items]    
Derivative liabilities 128,757 4,252
Swap    
Disclosure of financial liabilities [line items]    
Derivative liabilities 390,599 720,888
Currency swap contract [member]    
Disclosure of financial liabilities [line items]    
Derivative liabilities 60,845 112,600
Interest rate swap contract [member]    
Disclosure of financial liabilities [line items]    
Derivative liabilities 329,754 608,288
Futures Contracts    
Disclosure of financial liabilities [line items]    
Derivative liabilities 3,752 2,107
Futures Contract, Interest rate to sell    
Disclosure of financial liabilities [line items]    
Derivative liabilities 3,752 2,107
Options Contracts    
Disclosure of financial liabilities [line items]    
Derivative liabilities 84,087 143,430
Options Contracts, Foreign currency to buy    
Disclosure of financial liabilities [line items]    
Derivative liabilities   127,692
Options Contracts, Foreign currency to sell    
Disclosure of financial liabilities [line items]    
Derivative liabilities $ 84,087 $ 15,738