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Related parties - Transactions with related parties (Details) - COP ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Main transactions with related parties      
Sales and services $ 124,001 $ 116,884 $ 111,404
Purchases and others 606,836 590,860 708,444
Joint ventures      
Main transactions with related parties      
Sales and services 39,181 25,763 21,267
Purchases and others 559,793 543,565 643,131
Associates      
Main transactions with related parties      
Sales and services 84,820 91,121 90,137
Purchases and others 47,043 47,295 65,313
Gases del Caribe S.A. E.S.P. | Associates      
Main transactions with related parties      
Sales and services 0 0 0
Purchases and others 34,486 0 0
Gas Natural del Oriente S.A. E.S.P. | Associates      
Main transactions with related parties      
Sales and services 0 0 0
Purchases and others 5,394 39,659 53,994
Extrucol S.A. | Associates      
Main transactions with related parties      
Sales and services 0 16 20
Purchases and others 3,239 4,591 3,411
E2 Energia Eficiente S.A. E.S.P. | Associates      
Main transactions with related parties      
Sales and services 84,820 91,105 90,117
Purchases and others 3,924 3,045 7,908
Equion Energa Limited | Joint ventures      
Main transactions with related parties      
Sales and services 62 731 33
Purchases and others 43,452 2,578 23,845
Ecodiesel Colombia S.A. | Joint ventures      
Main transactions with related parties      
Sales and services 39,119 25,032 21,234
Purchases and others $ 516,341 $ 540,987 $ 619,286