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Intangible assets (Details) - COP ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Intangible assets    
Beginning balance $ 18,146,605  
Ending balance 14,714,809 $ 18,146,605
Licences and software    
Intangible assets    
Beginning balance 628,454  
Ending balance 698,038 628,454
Licences and software | Electric Power Transmission Lines [Member]    
Intangible assets    
Beginning balance 628,454 428,994
Ending balance   628,454
Other intangibles    
Intangible assets    
Beginning balance 836,081  
Ending balance 713,928 836,081
Other intangibles | Electric Power Transmission Lines [Member]    
Intangible assets    
Beginning balance 836,081 786,788
Ending balance   836,081
Concessions and rights    
Intangible assets    
Beginning balance 15,174,024  
Ending balance 11,878,160 15,174,024
Concessions and rights | Electric Power Transmission Lines [Member]    
Intangible assets    
Beginning balance 15,174,024 12,625,316
Ending balance   15,174,024
Easements    
Intangible assets    
Beginning balance 1,508,046  
Ending balance 1,424,683 1,508,046
Easements | Electric Power Transmission Lines [Member]    
Intangible assets    
Beginning balance 1,508,046 1,667,418
Ending balance   1,508,046
Intangible assets    
Intangible assets    
Beginning balance 18,146,605  
Ending balance 14,714,809 18,146,605
Intangible assets | Electric Power Transmission Lines [Member]    
Intangible assets    
Beginning balance 18,146,605 15,508,516
Ending balance   18,146,605
Cost | Licences and software    
Intangible assets    
Beginning balance 1,512,614  
Acquisitions 235,031  
Disposals (23,443)  
Foreign currency translation (95,373)  
Transfers/reclassifications 30,623  
Ending balance 1,659,452 1,512,614
Cost | Licences and software | Electric Power Transmission Lines [Member]    
Intangible assets    
Beginning balance 1,512,614 1,118,811
Acquisitions   292,803
Disposals   (4,148)
Foreign currency translation   74,759
Transfers/reclassifications   30,389
Ending balance   1,512,614
Cost | Other intangibles    
Intangible assets    
Beginning balance 1,282,752  
Acquisitions 8,270  
Disposals (62)  
Foreign currency translation (312,512)  
Transfers/reclassifications (8,592)  
Ending balance 969,856 1,282,752
Cost | Other intangibles | Electric Power Transmission Lines [Member]    
Intangible assets    
Beginning balance 1,282,752 940,080
Acquisitions   9,953
Effect of business combination   12,670
Foreign currency translation   338,654
Transfers/reclassifications   (18,605)
Ending balance   1,282,752
Cost | Concessions and rights    
Intangible assets    
Beginning balance 17,568,081  
Acquisitions 515,975  
Foreign currency translation (4,295,705)  
Transfers/reclassifications (129,202)  
Ending balance 13,659,149 17,568,081
Cost | Concessions and rights | Electric Power Transmission Lines [Member]    
Intangible assets    
Beginning balance 17,568,081 13,503,441
Acquisitions   835,457
Effect of business combination   (117,270)
Disposals   (95,875)
Foreign currency translation   3,439,810
Transfers/reclassifications   2,518
Ending balance   17,568,081
Cost | Easements    
Intangible assets    
Beginning balance 1,637,444  
Acquisitions 17,320  
Disposals (755)  
Foreign currency translation (113,875)  
Transfers/reclassifications 16,826  
Ending balance 1,556,960 1,637,444
Cost | Easements | Electric Power Transmission Lines [Member]    
Intangible assets    
Beginning balance 1,637,444 1,733,379
Acquisitions   9,297
Effect of business combination   (318,388)
Disposals   (478)
Foreign currency translation   86,905
Transfers/reclassifications   126,729
Ending balance   1,637,444
Cost | Intangible assets    
Intangible assets    
Beginning balance 22,000,891  
Acquisitions 776,596  
Disposals (24,260)  
Foreign currency translation (4,817,465)  
Transfers/reclassifications (90,345)  
Ending balance 17,845,417 22,000,891
Cost | Intangible assets | Electric Power Transmission Lines [Member]    
Intangible assets    
Beginning balance 22,000,891 17,295,711
Acquisitions   1,147,510
Effect of business combination   (422,988)
Disposals   (100,501)
Foreign currency translation   3,940,128
Transfers/reclassifications   141,031
Ending balance   22,000,891
Accumulated amortization | Licences and software    
Intangible assets    
Beginning balance (884,160)  
Amortization (165,635)  
Losses for impairment (4,418)  
Disposals 22,687  
Foreign currency translation 69,810  
Transfers/reclassifications 302  
Ending balance (961,414) (884,160)
Accumulated amortization | Licences and software | Electric Power Transmission Lines [Member]    
Intangible assets    
Beginning balance (884,160) (689,817)
Amortization   (138,544)
Losses for impairment   (1,785)
Disposals   3,283
Foreign currency translation   (58,215)
Transfers/reclassifications   918
Ending balance   (884,160)
Accumulated amortization | Other intangibles    
Intangible assets    
Beginning balance (446,671)  
Amortization (25,625)  
Losses for impairment (89)  
Disposals 62  
Foreign currency translation 216,395  
Transfers/reclassifications 0  
Ending balance (255,928) (446,671)
Accumulated amortization | Other intangibles | Electric Power Transmission Lines [Member]    
Intangible assets    
Beginning balance (446,671) (153,292)
Amortization   (30,282)
Losses for impairment   (15,323)
Foreign currency translation   (243,909)
Transfers/reclassifications   (3,865)
Ending balance   (446,671)
Accumulated amortization | Concessions and rights    
Intangible assets    
Beginning balance (2,394,057)  
Amortization (693,587)  
Losses for impairment (13,215)  
Foreign currency translation 1,319,870  
Ending balance (1,780,989) (2,394,057)
Accumulated amortization | Concessions and rights | Electric Power Transmission Lines [Member]    
Intangible assets    
Beginning balance (2,394,057) (878,125)
Amortization   (658,457)
Losses for impairment   (34,022)
Disposals   95,875
Foreign currency translation   (919,328)
Ending balance   (2,394,057)
Accumulated amortization | Easements    
Intangible assets    
Beginning balance (129,398)  
Amortization (7,346)  
Losses for impairment (197)  
Foreign currency translation 5,153  
Transfers/reclassifications (489)  
Ending balance (132,277) (129,398)
Accumulated amortization | Easements | Electric Power Transmission Lines [Member]    
Intangible assets    
Beginning balance (129,398) (65,961)
Amortization   (6,439)
Losses for impairment   (133)
Disposals   425
Foreign currency translation   (109)
Transfers/reclassifications   (57,181)
Ending balance   (129,398)
Accumulated amortization | Intangible assets    
Intangible assets    
Beginning balance (3,854,286)  
Amortization (892,193)  
Losses for impairment (17,919)  
Disposals 22,749  
Foreign currency translation 1,611,228  
Transfers/reclassifications (187)  
Ending balance (3,130,608) (3,854,286)
Accumulated amortization | Intangible assets | Electric Power Transmission Lines [Member]    
Intangible assets    
Beginning balance $ (3,854,286) (1,787,195)
Amortization   (833,722)
Losses for impairment   (51,263)
Disposals   99,583
Foreign currency translation   (1,221,561)
Transfers/reclassifications   (60,128)
Ending balance   $ (3,854,286)