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HEDGE ACCOUNTING - Fair value and interest expense (Details) - COP ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Disclosure of detailed information about hedging instruments [line items]    
Change in fair value $ 79,980 $ 154
Interest of the derivative designated as the hedging instrument (63,333) (1,242)
Banco de Bogota S.A.    
Disclosure of detailed information about hedging instruments [line items]    
Change in fair value 79,864 (14)
Interest of the derivative designated as the hedging instrument (61,905) (1,242)
Banco de Occidente S.A.    
Disclosure of detailed information about hedging instruments [line items]    
Change in fair value 116  
Interest of the derivative designated as the hedging instrument $ (1,428)  
Multi Financial Holding    
Disclosure of detailed information about hedging instruments [line items]    
Change in fair value   $ 168