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Disclosure Of Investments In Associates And Joint Ventures (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
IfrsStatementLineItems [Line Items]      
Share capital $ 36 $ 38  
(Loss) Profit of the year $ 238 $ (468) $ 800
Compania De Inversiones De Energia S A [Member]      
IfrsStatementLineItems [Line Items]      
Joint ventures [1] CIESA (1)    
Main activity [1] Investment    
Date [1] Dec. 31, 2021    
Share capital [1] $ 6    
(Loss) Profit of the year [1] 104    
Equity [1] $ 599    
Direct and indirect participation [1] 50.00%    
Compania Inversora En Transmision Electrica Citelec S A [Member]      
IfrsStatementLineItems [Line Items]      
Joint ventures [2] Citelec (2)    
Main activity [2] Investment    
Date [2] Dec. 31, 2021    
Share capital [2] $ 5    
(Loss) Profit of the year [2] (7)    
Equity [2] $ 204    
Direct and indirect participation [2] 50.00%    
C T B [Member]      
IfrsStatementLineItems [Line Items]      
Main activity Generation    
Date Dec. 31, 2021    
Share capital $ 83    
(Loss) Profit of the year 98    
Equity $ 454    
Direct and indirect participation 50.00%    
Greenwind S A [Member]      
IfrsStatementLineItems [Line Items]      
Joint ventures Greenwind    
Main activity Generation    
Date Dec. 31, 2021    
Share capital    
(Loss) Profit of the year (3)    
Equity $ (10)    
Direct and indirect participation 50.00%    
Refineria Del Norte S A [Member]      
IfrsStatementLineItems [Line Items]      
Joint ventures Refinor    
Main activity Refinery    
Date Sep. 30, 2021    
Share capital $ 1    
(Loss) Profit of the year (5)    
Equity $ 62    
Direct and indirect participation 28.50%    
Oleoducto De Crudos Pesados [Member]      
IfrsStatementLineItems [Line Items]      
Joint ventures OCP    
Main activity Investment    
Date Dec. 31, 2021    
Share capital $ 100    
(Loss) Profit of the year (2)    
Equity $ 126    
Direct and indirect participation 30.06%    
Transportadora De Gas Del Sur S A [Member]      
IfrsStatementLineItems [Line Items]      
Joint ventures [1] TGS (1)    
Main activity [1] Transport of gas    
Date [1] Dec. 31, 2021    
Share capital [1] $ 7    
(Loss) Profit of the year [1] 204    
Equity [1] $ 1,174    
Direct and indirect participation [1] 3.677%    
[1] The Company holds a direct and indirect interest of 3.677% in TGS and 50% in CIESA, a company that holds a 51% interest in the share capital of TGS. Therefore, additionally the Company has an indirect participation of 25.50% in TGS.
[2] Through a 50% interest, the company jointly controls Citelec, a company that controlled Transener with 52.65% of the shares and votes. As a result, the Company has an indirect participation of 26.33% in Transener.