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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, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Supplemental information on oil and gas producing activities (unaudited) |  |  |  |
Opening balance |  | 2,011 | 2,002 | 1,770
Proved reserves, Revisions of previous estimates | [1] | 9 | 63 | 315
Proved reserves, Improved recovery |  | 93 | 81 | 139
Proved reserves, Purchases |  | 0 | 48 | 0
Proved reserves, Extensions and discoveries |  | 17 | 57 | 12
Proved reserves, Sales |  | 0 | 0 | (3)
Proved reserves, Production |  | (247) | (240) | (231)
Closing balance |  | 1,883 | 2,011 | 2,002
Proved developed reserves: Opening balance |  | 1,376 | 1,370 | 1,297
Proved developed reserves: Closing balance |  | 1,435 | 1,376 | 1,370
Proved undeveloped reserves: Opening balance |  | 635 | 632 | 473
Proved undeveloped reserves: Closing balance |  | 448 | 635 | 632
Gas |  |  |  |
Supplemental information on oil and gas producing activities (unaudited) |  |  |  |
Opening balance |  | 2,828 | 3,151 | 2,921
Proved reserves, Revisions of previous estimates | [1] | (165) | (104) | 431
Proved reserves, Improved recovery |  | 9 | 21 | 107
Proved reserves, Purchases |  | 0 | 50 | 0
Proved reserves, Extensions and discoveries |  | 0 | 33 | 0
Proved reserves, Sales |  | 0 | 0 | (4)
Proved reserves, Production |  | (326) | (323) | (304)
Closing balance |  | 2,346 | 2,828 | 3,151
Proved developed reserves: Opening balance |  | 2,174 | 2,561 | 2,636
Proved developed reserves: Closing balance |  | 2,007 | 2,174 | 2,561
Proved undeveloped reserves: Opening balance |  | 654 | 590 | 285
Proved undeveloped reserves: Closing balance |  | 339 | 654 | 590
Oil |  |  |  |
Supplemental information on oil and gas producing activities (unaudited) |  |  |  |
Opening balance |  | 1,515 | 1,449 | 1,257
Proved reserves, Revisions of previous estimates | [1] | 38 | 81 | 240
Proved reserves, Improved recovery |  | 91 | 77 | 120
Proved reserves, Purchases |  | 0 | 39 | 0
Proved reserves, Extensions and discoveries |  | 17 | 52 | 12
Proved reserves, Sales |  | 0 | 0 | (3)
Proved reserves, Production |  | (190) | (183) | (177)
Closing balance |  | 1,471 | 1,515 | 1,449
Proved developed reserves: Opening balance |  | 995 | 921 | 834
Proved developed reserves: Closing balance |  | 1,083 | 995 | 921
Proved undeveloped reserves: Opening balance |  | 520 | 528 | 423
Proved undeveloped reserves: Closing balance |  | 388 | 520 | 528
[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
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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
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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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Data Type: | xbrli:stringItemType
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- Details
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- Details
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