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CONCESSION ARRANGEMENTS RIGHTS - Intangible assets in concession arrangements - Tabular disclosure (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]      
Beginning Balance $ 2,382,427 $ 2,040,158 $ 1,886,042
Additions 654,850 682,696 599,678
Amortization of the year (289,291) (277,022) (257,917)
Effect of movements in exchange rates 20,104 (35,407) 31,564
Ending Balance 2,758,318 2,382,427 2,040,158
Service concession arrangement [member]      
Disclosure of detailed information about service concession arrangements [line items]      
Beginning Balance 13,557,267 13,242,706 11,098,116
Ending Balance 14,314,560 13,557,267 13,242,706
Energy and Gas concession arrangement [member]      
Disclosure of detailed information about service concession arrangements [line items]      
Beginning Balance 5,524,828 5,891,841 4,831,161
Ending Balance 6,374,508 5,524,828 5,891,841
Infrastructure concession arrangement [member]      
Disclosure of detailed information about service concession arrangements [line items]      
Beginning Balance 8,032,439 7,350,865 6,266,955
Ending Balance 7,940,052 8,032,439 7,350,865
Cost | Service concession arrangement [member]      
Disclosure of detailed information about service concession arrangements [line items]      
Beginning Balance 15,348,044 14,760,176 12,311,890
Additions 742,131 1,302,943 1,912,368
Reclassification to / from PPE 244 4,270 113
Transfer to non-current assets held for sale (33,400)    
Withdrawals (21,794) (6,489) (11,724)
Effect of movements in exchange rates 472,522 (712,856) 547,529
Cost / (Amortization) / (Impairment loss) 1,159,703 587,868 2,448,286
Ending Balance 16,507,747 15,348,044 14,760,176
Cost | Energy and Gas concession arrangement [member]      
Disclosure of detailed information about service concession arrangements [line items]      
Beginning Balance 7,108,173 7,238,835 5,893,832
Additions 741,423 588,454 809,085
Reclassification to / from PPE 244 229 113
Transfer to non-current assets held for sale (33,400)    
Withdrawals (21,794) (6,489) (11,724)
Effect of movements in exchange rates 472,522 (712,856) 547,529
Cost / (Amortization) / (Impairment loss) 1,158,995 (130,662) 1,345,003
Ending Balance 8,267,168 7,108,173 7,238,835
Cost | Infrastructure concession arrangement [member]      
Disclosure of detailed information about service concession arrangements [line items]      
Beginning Balance 8,239,871 7,521,341 6,418,058
Additions 708 714,489 1,103,283
Reclassification to / from PPE   4,041  
Cost / (Amortization) / (Impairment loss) 708 718,530 1,103,283
Ending Balance 8,240,579 8,239,871 7,521,341
Accumulated Amortisation | Service concession arrangement [member]      
Disclosure of detailed information about service concession arrangements [line items]      
Beginning Balance (1,782,966) (1,505,046) (1,202,372)
Amortization of the year (397,046) (317,087) (272,708)
Reclassification to / from PPE 18 (2,184)  
Transfer to non-current assets held for sale 26,426    
Withdrawals 6,997 289 835
Effect of movements in exchange rates (37,931) 41,062 (30,801)
Cost / (Amortization) / (Impairment loss) (401,536) (277,920) (302,674)
Ending Balance (2,184,502) (1,782,966) (1,505,046)
Accumulated Amortisation | Energy and Gas concession arrangement [member]      
Disclosure of detailed information about service concession arrangements [line items]      
Beginning Balance (1,575,534) (1,339,183) (1,055,525)
Amortization of the year (303,951) (277,702) (253,692)
Reclassification to / from PPE 18    
Transfer to non-current assets held for sale 26,426    
Withdrawals 6,997 289 835
Effect of movements in exchange rates (37,931) 41,062 (30,801)
Cost / (Amortization) / (Impairment loss) (308,441) (236,351) (283,658)
Ending Balance (1,883,975) (1,575,534) (1,339,183)
Accumulated Amortisation | Infrastructure concession arrangement [member]      
Disclosure of detailed information about service concession arrangements [line items]      
Beginning Balance (207,432) (165,863) (146,847)
Amortization of the year (93,095) (39,385) (19,016)
Reclassification to / from PPE   (2,184)  
Cost / (Amortization) / (Impairment loss) (93,095) (41,569) (19,016)
Ending Balance (300,527) (207,432) (165,863)
Impairment loss | Service concession arrangement [member]      
Disclosure of detailed information about service concession arrangements [line items]      
Beginning Balance (7,811) (12,424) (11,402)
Impairment charge (874) 4,613 (1,022)
Cost / (Amortization) / (Impairment loss) (874) 4,613 (1,022)
Ending Balance (8,685) (7,811) (12,424)
Impairment loss | Energy and Gas concession arrangement [member]      
Disclosure of detailed information about service concession arrangements [line items]      
Beginning Balance (7,811) (7,811) (7,146)
Impairment charge (874)   (665)
Cost / (Amortization) / (Impairment loss) (874)   (665)
Ending Balance $ (8,685) (7,811) (7,811)
Impairment loss | Infrastructure concession arrangement [member]      
Disclosure of detailed information about service concession arrangements [line items]      
Beginning Balance   (4,613) (4,256)
Impairment charge   4,613 (357)
Cost / (Amortization) / (Impairment loss)   $ 4,613 (357)
Ending Balance     $ (4,613)