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CONCESSION ARRANGEMENTS RIGHTS - Intangible assets in concession arrangements - Tabular disclosure (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]      
Beginning Balance $ 2,040,158 $ 1,886,042 $ 1,623,670
Additions 682,696 599,678 482,528
Amortization of the year (277,022) (257,917) (237,628)
Impairment charge     3,000
Effect of movements in exchange rates (35,407) 31,564 22,874
Ending Balance 2,382,427 2,040,158 1,886,042
Service concession arrangement [member]      
Disclosure of detailed information about service concession arrangements [line items]      
Beginning Balance 13,242,706 11,098,116 9,187,564
Ending Balance 13,557,267 13,242,706 11,098,116
Gas and Energy Concession Arrangement [member]      
Disclosure of detailed information about service concession arrangements [line items]      
Beginning Balance 5,891,841 4,831,161 3,831,577
Ending Balance 5,524,828 5,891,841 4,831,161
Infrastructure Concession Arrangement [member]      
Disclosure of detailed information about service concession arrangements [line items]      
Beginning Balance 7,350,865 6,266,955 5,355,987
Ending Balance 8,032,439 7,350,865 6,266,955
Gross carrying amount [member] | Service concession arrangement [member]      
Disclosure of detailed information about service concession arrangements [line items]      
Beginning Balance 14,760,176 12,311,890 10,150,745
Additions 1,302,943 1,912,368 1,904,711
Reclassification to / from PPE 4,270 113 20,301
Transfer to non-current assets held for sale     2,516
Withdrawals (6,489) (11,724) (5,104)
Effect of movements in exchange rates (712,856) 547,529 238,721
Cost / (Amortization) / (Impairment loss) 587,868 2,448,286 2,161,145
Ending Balance 15,348,044 14,760,176 12,311,890
Gross carrying amount [member] | Gas and Energy Concession Arrangement [member]      
Disclosure of detailed information about service concession arrangements [line items]      
Beginning Balance 7,238,835 5,893,832 4,654,890
Additions 588,454 809,085 982,508
Reclassification to / from PPE 229 113 20,301
Transfer to non-current assets held for sale     2,516
Withdrawals (6,489) (11,724) (5,104)
Effect of movements in exchange rates (712,856) 547,529 238,721
Cost / (Amortization) / (Impairment loss) (130,662) 1,345,003 1,238,942
Ending Balance 7,108,173 7,238,835 5,893,832
Gross carrying amount [member] | Infrastructure Concession Arrangement [member]      
Disclosure of detailed information about service concession arrangements [line items]      
Beginning Balance 7,521,341 6,418,058 5,495,855
Additions 714,489 1,103,283 922,203
Reclassification to / from PPE 4,041    
Cost / (Amortization) / (Impairment loss) 718,530 1,103,283 922,203
Ending Balance 8,239,871 7,521,341 6,418,058
Accumulated depreciation and amortisation [member] | Service concession arrangement [member]      
Disclosure of detailed information about service concession arrangements [line items]      
Beginning Balance (1,505,046) (1,202,372) (957,943)
Reclassification to / from PPE (2,184)   (45)
Amortization of the year (317,087) (272,708) (232,815)
Withdrawals 289 835 1,236
Effect of movements in exchange rates 41,062 (30,801) (12,895)
Cost / (Amortization) / (Impairment loss) (277,920) (302,674) (244,429)
Ending Balance (1,782,966) (1,505,046) (1,202,372)
Accumulated depreciation and amortisation [member] | Gas and Energy Concession Arrangement [member]      
Disclosure of detailed information about service concession arrangements [line items]      
Beginning Balance (1,339,183) (1,055,525) (821,017)
Reclassification to / from PPE     (45)
Amortization of the year (277,702) (253,692) (222,894)
Withdrawals 289 835 1,236
Effect of movements in exchange rates 41,062 (30,801) (12,895)
Cost / (Amortization) / (Impairment loss) (236,351) (283,658) (234,508)
Ending Balance (1,575,534) (1,339,183) (1,055,525)
Accumulated depreciation and amortisation [member] | Infrastructure Concession Arrangement [member]      
Disclosure of detailed information about service concession arrangements [line items]      
Beginning Balance (165,863) (146,847) (136,926)
Reclassification to / from PPE (2,184)    
Amortization of the year (39,385) (19,016) (9,921)
Cost / (Amortization) / (Impairment loss) (41,569) (19,016) (9,921)
Ending Balance (207,432) (165,863) (146,847)
Accumulated impairment [member] | Service concession arrangement [member]      
Disclosure of detailed information about service concession arrangements [line items]      
Beginning Balance (12,424) (11,402) (5,238)
Impairment charge 4,613 (1,022) (6,164)
Cost / (Amortization) / (Impairment loss) 4,613 (1,022) (6,164)
Ending Balance (7,811) (12,424) (11,402)
Accumulated impairment [member] | Gas and Energy Concession Arrangement [member]      
Disclosure of detailed information about service concession arrangements [line items]      
Beginning Balance (7,811) (7,146) (2,296)
Impairment charge   (665) (4,850)
Cost / (Amortization) / (Impairment loss)   (665) (4,850)
Ending Balance (7,811) (7,811) (7,146)
Accumulated impairment [member] | Infrastructure Concession Arrangement [member]      
Disclosure of detailed information about service concession arrangements [line items]      
Beginning Balance (4,613) (4,256) (2,942)
Impairment charge 4,613 (357) (1,314)
Cost / (Amortization) / (Impairment loss) $ 4,613 (357) (1,314)
Ending Balance   $ (4,613) $ (4,256)