General Information (Detail) - employee	12 Months Ended
Dec. 31, 2020	Dec. 31, 2019
Disclosure Of General Information About Financial Statements [Line Items]
Number of employees	2,219	2,133
Average number of employees	2,202	2,104
Enel S.p.A. [member]
Disclosure Of General Information About Financial Statements [Line Items]
Ownership interest	64.93%

Disclosure of general information about financial statements.

No definition available.

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- Definition

The average number of personnel employed by the entity during a period.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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- Definition

The number of personnel employed by the entity at a date.

+ References

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- Definition

The proportion of ownership interest in a subsidiary attributable to the entity. [Refer: Subsidiaries [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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