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TRADING ASSETS AND LIABILITIES - Trading derivative liabilities (Details) - COP ($)
$ in Millions
Dec. 31, 2024
Dec. 31, 2023
Disclosure of financial liabilities [line items]    
Derivative liabilities $ 1,011,934 $ 2,154,361
Forward contract [member]    
Disclosure of financial liabilities [line items]    
Derivative liabilities 688,668 1,675,923
Forward contracts, Foreign currency to buy    
Disclosure of financial liabilities [line items]    
Derivative liabilities 62,051 1,543,886
Forward contracts, Foreign currency to sell    
Disclosure of financial liabilities [line items]    
Derivative liabilities 610,639 2,691
Forward contracts, Debt securities to buy    
Disclosure of financial liabilities [line items]    
Derivative liabilities 15,350 589
Forward contracts, Debt securities to sell    
Disclosure of financial liabilities [line items]    
Derivative liabilities 628 128,757
Swap contract [member]    
Disclosure of financial liabilities [line items]    
Derivative liabilities 274,277 390,599
Cross currency swap    
Disclosure of financial liabilities [line items]    
Derivative liabilities 52,455 60,845
Interest rate swap    
Disclosure of financial liabilities [line items]    
Derivative liabilities 221,822 329,754
Futures contract [member]    
Disclosure of financial liabilities [line items]    
Derivative liabilities   3,752
Futures Contract, Interest rate to sell    
Disclosure of financial liabilities [line items]    
Derivative liabilities   3,752
Option contract [member]    
Disclosure of financial liabilities [line items]    
Derivative liabilities 48,989 84,087
Options Contracts, Foreign currency to sell    
Disclosure of financial liabilities [line items]    
Derivative liabilities $ 48,989 $ 84,087