Basis of Presentation of the Consolidated Financial Statements – Joint Arrangements (Detail) - Transmisora Electrica de Quillota Ltda. [Member]	12 Months Ended
Dec. 31, 2020	Dec. 31, 2019
Statement Of Compliance And Basis Of Presentation [Line Items]
Direct	0.00%	0.00%
Indirect	50.00%	50.00%
Total	50.00%	50.00%

Proportion of indirect ownership interest in associates and joint ventures

No definition available.

Name:	enic_ProportionOfIndirectOwnershipInterestInAssociatesAndJointVentures
Namespace Prefix:	enic_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration