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TRADING ASSETS AND LIABILITIES - Investments in debt securities at fair value (Details) - COP ($)
$ in Millions
Dec. 31, 2024
Dec. 31, 2023
Disclosure of financial assets [line items]    
Financial assets $ 304,853,883 $ 280,746,878
Financial assets at fair value through profit or loss, category [member]    
Disclosure of financial assets [line items]    
Financial assets 24,400,493 19,332,588
Trading securities [member]    
Disclosure of financial assets [line items]    
Financial assets 20,163,214 15,451,121
Trading securities [member] | Held for trading    
Disclosure of financial assets [line items]    
Financial assets 20,163,214 15,451,121
Debt securities | Trading securities [member]    
Disclosure of financial assets [line items]    
Financial assets 11,937,414 7,113,380
Debt securities | Trading securities [member] | Held for trading    
Disclosure of financial assets [line items]    
Financial assets 11,937,414 7,113,380
Securities issued or secured by Colombian Government | Trading securities [member] | Held for trading    
Disclosure of financial assets [line items]    
Financial assets 10,641,558 5,794,832
Securities issued or secured by other Colombian Government entities | Trading securities [member] | Held for trading    
Disclosure of financial assets [line items]    
Financial assets 183,760 155,737
Securities issued or secured by foreign Governments | Trading securities [member] | Held for trading    
Disclosure of financial assets [line items]    
Financial assets 75,379 32,079
Securities issued or secured by other financial entities | Trading securities [member] | Held for trading    
Disclosure of financial assets [line items]    
Financial assets 1,002,194 1,084,461
Securities issued by entities of the non-financial sector entities | Trading securities [member] | Held for trading    
Disclosure of financial assets [line items]    
Financial assets 8,813 6,406
Other debt securities | Trading securities [member] | Held for trading    
Disclosure of financial assets [line items]    
Financial assets $ 25,710 $ 39,865