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The Group's Activities and Financial Statements - Additional Information (Detail)
12 Months Ended
Apr. 03, 2018
Apr. 02, 2018
Dec. 31, 2019
employee
Dec. 31, 2018
employee
Notes And Other Explanatory Information [Line Items]        
Number of employees     710 767
Average number of employees     705  
Group Activities and Financial Statements - Additional Information [Abstract]        
Proportion of ownership interests held by non-controlling interests     40.00%  
Enel Chile S.A. [Member]        
Group Activities and Financial Statements - Additional Information [Abstract]        
Proportion of ownership interest in subsidiary     50.00%  
Notes And Other Explanatory Information [Abstract]        
Proportion of ownership interest in subsidiary     50.00%  
Enel Chile S.A. [Member]        
Group Activities and Financial Statements - Additional Information [Abstract]        
Aggregate ownership interest percentage 93.55 59.98 60  
Bottom of Range | Enel Chile S.A. [Member]        
Group Activities and Financial Statements - Additional Information [Abstract]        
Ownership limit percent     65.00%  
Bottom of Range | Enel Chile S.A. [Member]        
Group Activities and Financial Statements - Additional Information [Abstract]        
Aggregate ownership interest percentage     75  
Percentage of issued capital     65.00%