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CONCESSION ARRANGEMENTS RIGHTS - Financial assets in concession arrangements (Details) - COP ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Disclosure of detailed information about service concession arrangements [line items]      
Financial assets at beginning of period $ 274,682,875    
Net income from other financial instruments mandatorily at FVTPL 323,685 $ 278,751 $ 270,095
Impairment expense (4,182,394) (2,493,148) (2,721,083)
Financial assets at end of period 280,746,878 274,682,875  
Financial assets at fair value through profit or loss, category [member]      
Disclosure of detailed information about service concession arrangements [line items]      
Financial assets at beginning of period 15,370,870    
Financial assets at end of period 19,332,588 15,370,870  
Financial assets at amortised cost, category [member]      
Disclosure of detailed information about service concession arrangements [line items]      
Financial assets at beginning of period 235,373,468    
Impairment expense (4,802,074) (3,179,476) (4,551,160)
Financial assets at end of period 236,970,165 235,373,468  
Service concession arrangement [member]      
Disclosure of detailed information about service concession arrangements [line items]      
Financial assets at beginning of period 16,153,016 13,081,532 9,727,508
Additions or new concession arrangements 995,993 1,695,025 2,613,987
Collections during the year (1,144,396) (732,647) (273,665)
Net income from other financial instruments mandatorily at FVTPL 323,685 278,751 270,095
Accrued interest 1,493,115 1,831,326 746,657
Impairment expense (223) (1,220) (3,050)
Effect of movements in exchange rates (8,370) 249  
Financial assets at end of period 17,812,820 16,153,016 13,081,532
Service concession arrangement [member] | Financial assets at fair value through profit or loss, mandatorily measured at fair value, category [member]      
Disclosure of detailed information about service concession arrangements [line items]      
Financial assets at beginning of period 3,507,231    
Financial assets at end of period 3,830,916 3,507,231  
Service concession arrangement [member] | Financial assets at amortised cost, category [member]      
Disclosure of detailed information about service concession arrangements [line items]      
Financial assets at beginning of period 12,645,785    
Financial assets at end of period 13,981,904 12,645,785  
Gas and Energy Concession Arrangement [member]      
Disclosure of detailed information about service concession arrangements [line items]      
Financial assets at beginning of period 3,512,055 3,228,480 2,958,385
Additions or new concession arrangements 118,109 4,575  
Net income from other financial instruments mandatorily at FVTPL 323,685 278,751 270,095
Effect of movements in exchange rates (8,370) 249  
Financial assets at end of period 3,945,479 3,512,055 3,228,480
Gas and Energy Concession Arrangement [member] | Financial assets at fair value through profit or loss, mandatorily measured at fair value, category [member]      
Disclosure of detailed information about service concession arrangements [line items]      
Financial assets at beginning of period 3,507,231 3,228,480 2,958,385
Net income from other financial instruments mandatorily at FVTPL 323,685 278,751 270,095
Financial assets at end of period 3,830,916 3,507,231 3,228,480
Gas and Energy Concession Arrangement [member] | Financial assets at amortised cost, category [member]      
Disclosure of detailed information about service concession arrangements [line items]      
Financial assets at beginning of period 4,824    
Additions or new concession arrangements 118,109 4,575  
Effect of movements in exchange rates (8,370) 249  
Financial assets at end of period 114,563 4,824  
Infrastructure Concession Arrangement [member] | Financial assets at amortised cost, category [member]      
Disclosure of detailed information about service concession arrangements [line items]      
Financial assets at beginning of period 12,640,961 9,853,052 6,769,123
Additions or new concession arrangements 877,884 1,690,450 2,613,987
Collections during the year (1,144,396) (732,647) (273,665)
Accrued interest 1,493,115 1,831,326 746,657
Impairment expense (223) (1,220) (3,050)
Financial assets at end of period $ 13,867,341 $ 12,640,961 $ 9,853,052