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Related parties - Transactions with related parties (Details) - COP ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Main transactions with related parties      
Sales and services $ 116,884 $ 111,404 $ 109,980
Purchases and others 590,860 708,444 627,924
Joint ventures      
Main transactions with related parties      
Sales and services 25,763 21,267 49,821
Purchases and others 543,565 643,131 591,419
Associates      
Main transactions with related parties      
Sales and services 91,121 90,137 60,159
Purchases and others 47,295 65,313 36,505
Gas Natural del Oriente S.A. E.S.P. | Associates      
Main transactions with related parties      
Sales and services 0 0 0
Purchases and others 39,659 53,994 27,175
Extrucol S.A. | Associates      
Main transactions with related parties      
Sales and services 16 20 0
Purchases and others 4,591 3,411 2,354
E2 Energia Eficiente S.A. E.S.P. | Associates      
Main transactions with related parties      
Sales and services 91,105 90,117 60,159
Purchases and others 3,045 7,908 6,976
Equion Energa Limited | Joint ventures      
Main transactions with related parties      
Sales and services 731 33 13,996
Purchases and others 2,578 23,845 149,046
Ecodiesel Colombia S.A. | Joint ventures      
Main transactions with related parties      
Sales and services 25,032 21,234 35,825
Purchases and others $ 540,987 $ 619,286 $ 442,373