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Basis of Presentation of the Consolidated Financial Statements - Joint Arrangements (Detail)
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Apr. 01, 2021
Enel Green Power Chile S.A. [Member]      
Statement Of Compliance And Basis Of Presentation [Line Items]      
Percentage of voting equity interests acquired     50.00%
Transmisora Electrica de Quillota Ltda. [Member]      
Statement Of Compliance And Basis Of Presentation [Line Items]      
Direct 0.00% 0.00%  
Indirect   50.00%  
Total   50.00%  
HIF H2 S.p.A [Member]      
Statement Of Compliance And Basis Of Presentation [Line Items]      
Direct 0.00% 0.00%  
Indirect 50.00%    
Total 50.00%