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Supplemental information on oil and gas producing activities (unaudited) - Reserve information (Details) - gal | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Supplemental information on oil and gas producing activities (unaudited) |  |  |  |
Opening balance |  | 1,883 | 2,011 | 2,002
Proved reserves, Revisions of previous estimates | [1] | 84 | 9 | 63
Proved reserves, Improved recovery |  | 97 | 93 | 81
Proved reserves, Purchases |  | 35 | 0 | 48
Proved reserves, Extensions and discoveries |  | 49 | 17 | 57
Proved reserves, Sales |  | (6) | 0 | 0
Proved reserves, Production |  | (250) | (247) | (240)
Closing balance |  | 1,892 | 1,883 | 2,011
Proved developed reserves: Opening balance |  | 1,435 | 1,376 | 1,370
Proved developed reserves: Closing balance |  | 1,394 | 1,435 | 1,376
Proved undeveloped reserves: Opening balance |  | 448 | 635 | 632
Proved undeveloped reserves: Closing balance |  | 498 | 448 | 635
Gas |  |  |  |
Supplemental information on oil and gas producing activities (unaudited) |  |  |  |
Opening balance |  | 2,346 | 2,828 | 3,151
Proved reserves, Revisions of previous estimates | [1] | (55) | (165) | (104)
Proved reserves, Improved recovery |  | 102 | 9 | 21
Proved reserves, Purchases |  | 5 | 0 | 50
Proved reserves, Extensions and discoveries |  | 40 | 0 | 33
Proved reserves, Sales |  | (5) | 0 | 0
Proved reserves, Production |  | (317) | (326) | (323)
Closing balance |  | 2,116 | 2,346 | 2,828
Proved developed reserves: Opening balance |  | 2,007 | 2,174 | 2,561
Proved developed reserves: Closing balance |  | 1,750 | 2,007 | 2,174
Proved undeveloped reserves: Opening balance |  | 339 | 654 | 590
Proved undeveloped reserves: Closing balance |  | 366 | 339 | 654
Oil |  |  |  |
Supplemental information on oil and gas producing activities (unaudited) |  |  |  |
Opening balance |  | 1,471 | 1,515 | 1,449
Proved reserves, Revisions of previous estimates | [1] | 94 | 38 | 81
Proved reserves, Improved recovery |  | 79 | 91 | 77
Proved reserves, Purchases |  | 35 | 0 | 39
Proved reserves, Extensions and discoveries |  | 42 | 17 | 52
Proved reserves, Sales |  | (5) | 0 | 0
Proved reserves, Production |  | (194) | (190) | (183)
Closing balance |  | 1,522 | 1,471 | 1,515
Proved developed reserves: Opening balance |  | 1,083 | 995 | 921
Proved developed reserves: Closing balance |  | 1,087 | 1,083 | 995
Proved undeveloped reserves: Opening balance |  | 388 | 520 | 528
Proved undeveloped reserves: Closing balance |  | 435 | 388 | 520
[1] | Represents changes in previous proved reserves, upward or downward, resulting from new information (except for an increase in a proved area), usually obtained from development drilling and production history or result from changes in economic factors.

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- Definition Net quantities of an enterprise's interests in proved developed reserves of either crude oil (including condensate and natural gas liquids), natural gas, synthetic oil and gas, or other nonrenewable natural resource that is intended to be upgraded into synthetic oil and gas as of the beginning and the end of the year. "Net" quantities of reserves include those relating to the enterprise's operating and nonoperating interests in properties. Quantities of reserves relating to royalty interests owned are included in "net" quantities if the necessary information is available to the enterprise. "Net" quantities does not include reserves relating to interests of others in properties owned by the enterprise. The unit of measure for reserve quantities is defined as "barrels" for oil and synthetic oil reserves or "cubic feet" or "cubic meters" for natural gas and synthetic gas reserves. + References No definition available. + Details
Name: | ec_ProvedDevelopedReserves
Namespace Prefix: | ec_
Data Type: | dtr-types:volumeItemType
Balance Type: | na
Period Type: | instant

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- Definition The net quantity of proved reserves as of the balance sheet date. Proved oil reserves are the estimated quantities of crude oil and natural gas liquids which geological and engineering data demonstrate with reasonable certainty to be recoverable. + References No definition available. + Details
Name: | ec_ProvedOilAndGasReservesNet
Namespace Prefix: | ec_
Data Type: | dtr-types:volumeItemType
Balance Type: | na
Period Type: | instant

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- Definition Additions to proved reserves that result from (1) extension of the proved acreage of previously discovered (old) reservoirs through additional drilling in periods after discovery and (2) discovery of new fields with proved reserves or of new reservoirs of proved reserves in old fields. + References No definition available. + Details
Name: | ec_ProvedReservesExtensionsDiscoveriesAndAdditions
Namespace Prefix: | ec_
Data Type: | dtr-types:volumeItemType
Balance Type: | na
Period Type: | duration

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- Definition Changes in proved reserve estimates resulting from application of improved recovery techniques. + References No definition available. + Details
Name: | ec_ProvedReservesImprovedRecovery
Namespace Prefix: | ec_
Data Type: | dtr-types:volumeItemType
Balance Type: | na
Period Type: | duration

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- Definition Production of proved reserves. + References No definition available. + Details
Name: | ec_ProvedReservesProduction
Namespace Prefix: | ec_
Data Type: | dtr-types:volumeItemType
Balance Type: | na
Period Type: | duration

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- Definition Purchases of proved reserves. + References No definition available. + Details
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Namespace Prefix: | ec_
Data Type: | dtr-types:volumeItemType
Balance Type: | na
Period Type: | duration

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- Definition Revisions represent changes in previous estimates of proved reserves, either upward or downward, resulting from new information (except for an increase in proved acreage) normally obtained from development drilling and production history or resulting from change in economic factors. + References No definition available. + Details
Name: | ec_ProvedReservesRevisionsOfPreviousEstimates
Namespace Prefix: | ec_
Data Type: | dtr-types:volumeItemType
Balance Type: | na
Period Type: | duration

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- Definition Sales of proved reserves. + References No definition available. + Details
Name: | ec_ProvedReservesSales
Namespace Prefix: | ec_
Data Type: | dtr-types:volumeItemType
Balance Type: | na
Period Type: | duration

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- Definition Net quantities of an enterprise's interests in proved undeveloped reserves of either crude oil (including condensate and natural gas liquids), natural gas, synthetic oil and gas, or other renewable natural resource that is intended to be upgraded into synthetic oil and gas as of the beginning and the end of the year. "Net" quantities of reserves include those relating to the enterprise's operating and nonoperating interests in properties. Quantities of reserves relating to royalty interests owned are included in "net" quantities if the necessary information is available to the enterprise. "Net" quantities does not include reserves relating to interests of others in properties owned by the enterprise. The unit of measure for reserve quantities is defined as "barrels" for oil and synthetic oil reserves or "cubic feet" or "cubic meters" for natural gas and synthetic gas reserves. + References No definition available. + Details
Name: | ec_ProvedUndevelopedReserve
Namespace Prefix: | ec_
Data Type: | dtr-types:volumeItemType
Balance Type: | na
Period Type: | instant

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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Namespace Prefix: | ec_
Data Type: | xbrli:stringItemType
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Period Type: | duration

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- Details
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Namespace Prefix: |
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- Details
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Period Type: |