Reporting entity (Details)	Dec. 31, 2025
Reporting entity
Proportion of shares available for public trade held privately	11.51%
Proportion of shares held by majority share holders	88.49%

The percentage of shares which are held by majority share holders not available for public trade.

No definition available.

Name:	ec_ProportionOfSharesHeldByMajorityShareHolders
Namespace Prefix:	ec_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant