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HEDGE ACCOUNTING - Fair value hedges (Details)
$ in Millions
 12 Months Ended
Dec. 31, 2024
COP ($)
Dec. 31, 2023
COP ($)
Disclosure of detailed information about hedging instruments [line items]    
Assets $ 54,019 $ 48,662
Liabilities 21,658 217,566
Change in fair value (1,372) 79,980
Banco de Bogota S.A.    
Disclosure of detailed information about hedging instruments [line items]    
Change in fair value $ 5,960 79,864
Banco de Occidente S.A.    
Disclosure of detailed information about hedging instruments [line items]    
Notional amount 411,000  
Liabilities $ 7,250  
Change in fair value $ (83) $ 116
Time deposits [member] | Banco de Bogota S.A.    
Disclosure of detailed information about hedging instruments [line items]    
Notional amount 4,644,189 6,539,684
Liabilities $ 66,064 $ 40,289
Time deposits [member] | Banco de Occidente S.A.    
Disclosure of detailed information about hedging instruments [line items]    
Notional amount   435,000
Liabilities   $ 734
Interest rate swap contract [member] | Banco de Bogota S.A.    
Disclosure of detailed information about hedging instruments [line items]    
Notional amount 4,644,189 6,539,684
Assets $ 68,840 $ 47,975
Liabilities   $ 10,871
Interest rate swap contract [member] | Banco de Occidente S.A.    
Disclosure of detailed information about hedging instruments [line items]    
Notional amount 411,000 435,000
Assets $ 7,333 $ 850