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Investments in associates and joint ventures - Additional information about associates and joint ventures (Details) - COP ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Statement of financial position        
Current assets $ 60,659,805 $ 68,615,106    
Non-current assets 237,582,351 211,525,984    
Total assets 298,242,156 280,141,090    
Current liabilities 39,635,471 43,564,563    
Non-current liabilities 152,693,246 136,324,047    
Total liabilities 192,328,717 179,888,610    
Net equity 105,913,439 100,252,480 $ 113,903,089 $ 90,583,772
Other complementary information        
Cash and cash equivalents 14,054,475 12,336,115 15,401,058 $ 14,549,906
Statement of profit or loss        
Sales revenue 133,330,428 143,189,602 159,611,078  
Costs (86,481,154) (88,178,198) (89,458,148)  
Other operating expenses, net (5,103,103) (5,025,797) (4,335,695)  
Financial (expenses) income (8,519,948) (5,665,384) (6,834,757)  
Income tax 12,208,540 11,515,875 18,963,938  
Financial year results 18,498,875 25,383,071 35,199,480  
Other comprehensive results 2,943,021 (11,455,618) $ 8,894,726  
Interligao Eltrica do Madeira        
Statement of financial position        
Current assets 650,066 675,192    
Non-current assets 4,729,026 5,064,524    
Total assets 5,379,092 5,739,716    
Current liabilities 416,641 290,292    
Non-current liabilities 1,843,439 2,288,606    
Total liabilities 2,260,080 2,578,898    
Net equity 3,119,012 3,160,818    
Other complementary information        
Cash and cash equivalents 121,823 193,009    
Statement of profit or loss        
Sales revenue 572,619 613,807    
Costs (27,966) (33,798)    
Other operating expenses, net 0      
Financial (expenses) income (91,419) (125,247)    
Income tax (92,027) (97,899)    
Financial year results 361,207 356,863    
Other comprehensive results 0 0    
Depreciation and amortization 728 804    
Transmissora Aliana de Energia Eltrica        
Statement of financial position        
Current assets 1,648,936 2,167,294    
Non-current assets 11,582,196 11,709,871    
Total assets 13,231,132 13,877,165    
Current liabilities 1,412,355 1,276,744    
Non-current liabilities 6,875,987 7,327,321    
Total liabilities 8,288,342 8,604,065    
Net equity 4,942,790 5,273,100    
Other complementary information        
Cash and cash equivalents 3,858 624    
Statement of profit or loss        
Sales revenue 1,757,883 1,165,129    
Costs (260,523) (191,359)    
Other operating expenses, net (168,309) (133,717)    
Financial (expenses) income 81,962 327,744    
Income tax (70,168) (46,465)    
Financial year results 1,340,845 1,121,332    
Other comprehensive results 10,073 (46,177)    
Depreciation and amortization 42,834 30,875    
Equion Energa Limited        
Statement of financial position        
Current assets 104,545 1,395,515    
Non-current assets 1,563,339 5,661    
Total assets 1,667,884 1,401,176    
Current liabilities 41,600 29,726    
Non-current liabilities 29,121 42,056    
Total liabilities 70,721 71,782    
Net equity 1,597,163 1,329,394    
Other complementary information        
Cash and cash equivalents 25,394 34,378    
Statement of profit or loss        
Sales revenue 125 11    
Costs (22,189) (23,815)    
Other operating expenses, net (722) (2,579)    
Financial (expenses) income 95,397 82,424    
Income tax (22,673) (17,323)    
Financial year results 49,938 38,718    
Other comprehensive results $ 1,014,048 796,213    
Depreciation and amortization   $ 21