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CONCESSION ARRANGEMENTS RIGHTS - Financial assets in concession arrangements (Details) - COP ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Disclosure of detailed information about service concession arrangements [line items]      
Financial assets at beginning of period $ 280,746,878    
Adjustment to fair value 350,919 $ 323,685 $ 278,751
Impairment expense (4,185,037) (4,182,394) (2,493,148)
Financial assets at end of period 304,853,883 280,746,878  
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 19,332,588    
Financial assets at end of period 24,400,493 19,332,588  
Financial assets at amortised cost, category [member]      
Disclosure of detailed information about service concession arrangements [line items]      
Financial assets at beginning of period 236,970,165    
Impairment expense (4,826,291) (4,802,074) (3,179,476)
Financial assets at end of period 251,981,889 236,970,165  
Service concession arrangement [member]      
Disclosure of detailed information about service concession arrangements [line items]      
Financial assets at beginning of period 17,812,820 16,153,016 13,081,532
Additions or new concession arrangements 1,177,274 995,993 1,695,025
Collections during the year (971,634) (1,144,396) (732,647)
Adjustment to fair value 350,919 323,685 278,751
Accrued interest 861,175 1,493,115 1,831,326
Impairment expense (709) (223) (1,220)
Effect of movements in exchange rates 30,396 (8,370) 249
Financial assets at end of period 19,260,241 17,812,820 16,153,016
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 3,830,916    
Financial assets at end of period 4,181,835 3,830,916  
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 13,981,904    
Financial assets at end of period 15,078,406 13,981,904  
Energy and Gas concession arrangement [member]      
Disclosure of detailed information about service concession arrangements [line items]      
Financial assets at beginning of period 3,945,479 3,512,055 3,228,480
Additions or new concession arrangements 76,572 118,109 4,575
Collections during the year (74,231)    
Adjustment to fair value 350,919 323,685 278,751
Effect of movements in exchange rates 30,396 (8,370) 249
Financial assets at end of period 4,329,135 3,945,479 3,512,055
Energy and Gas 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 3,830,916 3,507,231 3,228,480
Adjustment to fair value 350,919 323,685 278,751
Financial assets at end of period 4,181,835 3,830,916 3,507,231
Energy and Gas 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 114,563 4,824  
Additions or new concession arrangements 76,572 118,109 4,575
Collections during the year (74,231)    
Effect of movements in exchange rates 30,396 (8,370) 249
Financial assets at end of period 147,300 114,563 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 13,867,341 12,640,961 9,853,052
Additions or new concession arrangements 1,100,702 877,884 1,690,450
Collections during the year (897,403) (1,144,396) (732,647)
Accrued interest 861,175 1,493,115 1,831,326
Impairment expense (709) (223) (1,220)
Financial assets at end of period $ 14,931,106 $ 13,867,341 $ 12,640,961