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EQUITY ATTRIBUTABLE TO OWNERS OF THE PARENT - Equity transactions - Subsidiary transactions (Details) - COP ($)
$ / shares in Units, $ in Millions
 1 Months Ended 12 Months Ended
Jun. 30, 2024
Mar. 31, 2024
Dec. 31, 2024
Dec. 31, 2022
Disclosure of subsidiaries [line items]        
Equity transactions     $ (76,823) $ (15,091)
Non-controlling interests [member]        
Disclosure of subsidiaries [line items]        
Equity transactions     (13,511) (13,359)
Equity attributable to owners of parent [member]        
Disclosure of subsidiaries [line items]        
Equity transactions     $ (63,312) $ (1,732)
Corficolombiana        
Disclosure of subsidiaries [line items]        
Dividends paid to non-controlling interests, per share   $ 1,135    
Equity transactions   $ (21,823)    
Corficolombiana | Non-controlling interests [member]        
Disclosure of subsidiaries [line items]        
Equity transactions   (8,845)    
Corficolombiana | Equity attributable to owners of parent [member]        
Disclosure of subsidiaries [line items]        
Equity transactions   $ (12,978)    
Compania Hotelera Cartagena de Indias S.A.        
Disclosure of subsidiaries [line items]        
Proportion of ownership interests held by non-controlling interests (as a percent) 39.52%      
Non-controlling interests, ownership interests, shares acquired (in shares) 14,594,928      
Equity transactions $ (55,000)      
Compania Hotelera Cartagena de Indias S.A. | Non-controlling interests [member]        
Disclosure of subsidiaries [line items]        
Equity transactions (4,904)      
Compania Hotelera Cartagena de Indias S.A. | Equity attributable to owners of parent [member]        
Disclosure of subsidiaries [line items]        
Equity transactions $ (50,096)