Joint operations - Contracts in which Ecopetrol is the operator (Details)	12 Months Ended
Dec. 31, 2025
Joint operations
Geographic area of operations	Colombia
VMM29 \| ExxonMobil Exploration Colombia \| Contract where Entity is operator
Joint operations
Contract	VMM29
Geographic area of operations	Colombia
CR2 \| ExxonMobil Exploration Colombia \| Contract where Entity is operator
Joint operations
Contract	CR2
Type	Exploration
% Participation	50.00%
Geographic area of operations	Colombia
C62 \| ExxonMobil Exploration Colombia \| Contract where Entity is operator
Joint operations
Contract	C62
Type	Exploration
% Participation	50.00%
Geographic area of operations	Colombia
VMM32 \| CPVEN E&P Corp Sucursal Colombia \| Contract where Entity is operator
Joint operations
Contract	VMM32
Type	Exploration
% Participation	51.00%
Geographic area of operations	Colombia
Catleya \| Repsol Exploracion Colombia S.A. \| Contract where Entity is operator
Joint operations
Contract	Catleya
Type	Exploration
% Participation	50.00%
Geographic area of operations	Colombia
Cardon \| Emerald Energy PLC Suc. Colombia \| Contract where Entity is operator
Joint operations
Contract	Cardon
Type	Exploration
% Participation	50.00%
Geographic area of operations	Colombia
ORC401 CRC-2004-01 \| Parex Resourses Colombia Ltd. \| Contract where Entity is operator
Joint operations
Contract	ORC401 CRC-2004-01
Type	Exploration
% Participation	50.00%
Geographic area of operations	Colombia
OJANOM \| Parex Resourses Colombia Ltd. \| Contract where Entity is operator
Joint operations
Contract	OJANOM
Type	Exploration
% Participation	100.00%
Geographic area of operations	Colombia
OJAOCN \| Parex Resourses Colombia Ltd. \| Contract where Entity is operator
Joint operations
Contract	OJAOCN
Type	Production
% Participation	100.00%
Geographic area of operations	Colombia
OJAORM \| Parex Resourses Colombia Ltd. \| Contract where Entity is operator
Joint operations
Contract	OJAORM
Type	Production
% Participation	100.00%
Geographic area of operations	Colombia
OJASUM \| Parex Resourses Colombia Ltd. \| Contract where Entity is operator
Joint operations
Contract	OJASUM
Type	Production
% Participation	100.00%
Geographic area of operations	Colombia
La Cira Infantas \| SierraCol Energy Arauca, LLC \| Contract where Entity is operator
Joint operations
Contract	La Cira Infantas
Type	Production
Geographic area of operations	Colombia
% participation in addition to PAP	52.00%
Teca \| SierraCol Energy Arauca, LLC \| Contract where Entity is operator
Joint operations
Contract	Teca
Type	Production
% participation, basic	100.00%
% participation, incremental	60.00%
Oleoducto Alto Magdalena \| Emerald Energy \| Contract where Entity is operator
Joint operations
Contract	Oleoducto Alto Magdalena
Type	Production
% Participation	45.00%
Geographic area of operations	Colombia
Ro Paez \| Colombia Energy Development CO \| Contract where Entity is operator
Joint operations
Contract	Rio Paez
Type	Production
% Participation	68.00%
Geographic area of operations	Colombia
Asociacion Guajira \| Ecopetrol \| Contract where Entity is operator
Joint operations
Contract	Asociación Guajira
Type	Production
% Participation	43.00%
Geographic area of operations	Colombia
Asociacion Boqueron \| Perenco Oil And Gas \| Contract where Entity is operator
Joint operations
Contract	San Jacinto Rio Paez
Type	Production
% Participation	40.00%
Geographic area of operations	Colombia
San Jacinto \| Ecopetrol \| Contract where Entity is operator
Joint operations
Contract	San Jacinto
Type	Production
% Participation	50.00%
Geographic area of operations	Colombia
San Jacinto (Mandato) \| Ecopetrol \| Contract where Entity is operator
Joint operations
Contract	San Jacinto (Mandato)
Type	Production
% Participation	0.00%
Geographic area of operations	Colombia

Percentage of ownership interest in joint venture basic.

No definition available.

Name:	ec_PercentageOfOwnershipInterestInJointVentureBasic
Namespace Prefix:	ec_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Percentage of ownership interest in joint venture in addition to PAP.

+ References

No definition available.

+ Details

Name:	ec_PercentageOfOwnershipInterestInJointVentureInAdditionToPap
Namespace Prefix:	ec_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Percentage of ownership interest in joint venture incremental.

+ References

No definition available.

+ Details

Name:	ec_PercentageOfOwnershipInterestInJointVentureIncremental
Namespace Prefix:	ec_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Represents the type of contract.

+ References

No definition available.

+ Details

Name:	ec_TypeOfContract
Namespace Prefix:	ec_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with members defined in one or many axes of the table.

+ References

No definition available.

+ Details

Name:	ifrs-full_DisclosureOfJointOperationsLineItems
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

The name of a joint operation. [Refer: Total for all joint operations [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 12
-IssueDate 2025-01-01
-Paragraph 21
-Subparagraph a
-Clause i
-URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=12&code=ifrs-tx-2025-en-r&anchor=para_21_a_i&doctype=Standard
-URIDate 2025-03-27

+ Details

Name:	ifrs-full_NameOfJointOperation
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

The principal place of business of a joint operation. [Refer: Total for all joint operations [member]; Principal place of business]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 12
-IssueDate 2025-01-01
-Paragraph 21
-Subparagraph a
-Clause iii
-URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=12&code=ifrs-tx-2025-en-r&anchor=para_21_a_iii&doctype=Standard
-URIDate 2025-03-27

+ Details

Name:	ifrs-full_PrincipalPlaceOfBusinessOfJointOperation
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

The proportion of ownership interest in a joint operation attributable to the entity. [Refer: Total for all joint operations [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 12
-IssueDate 2025-01-01
-Paragraph 21
-Subparagraph a
-Clause iv
-URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=12&code=ifrs-tx-2025-en-r&anchor=para_21_a_iv&doctype=Standard
-URIDate 2025-03-27

+ Details

Name:	ifrs-full_ProportionOfOwnershipInterestInJointOperation
Namespace Prefix:	ifrs-full_
Data Type:	dtr-2022:percentItemType
Balance Type:	na
Period Type:	duration