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Schedule of changes in intangible assets (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
IfrsStatementLineItems [Line Items]      
Intangible assets, beginning   $ 62 $ 312
Increase $ 4  
Impairment [1] (18) (147)  
Decrease (4)  
Translation effect (3)  
Reclasification to assets clasified as held for sales (100)  
Intangible assets, ending 44 62  
Intangible assets amortization, beginning (21) (161)  
Impairment [1] 16 129  
Reclasification to assets clasified as held for sales 16  
Intangible assets amortization, ending (6) (21)  
Depreciation for the year [2] (1) (5)  
Intangible assets 38 41  
Impairment Loss 589    
Diamante Hydroelectric Power [Member]      
IfrsStatementLineItems [Line Items]      
Impairment Loss 2    
Diamante And Nihuiles Hydroelectric Power [Member]      
IfrsStatementLineItems [Line Items]      
Impairment Loss   18  
Concession Agreements [Member]      
IfrsStatementLineItems [Line Items]      
Intangible assets, beginning   20  
Increase    
Impairment [1] (18)    
Decrease    
Translation effect    
Reclasification to assets clasified as held for sales    
Intangible assets, ending 2    
Intangible assets amortization, beginning   (18)  
Impairment [1] 16    
Depreciation for the year [2]    
Reclasification to assets clasified as held for sales    
Intangible assets amortization, ending (2)    
Intangible assets 2  
Goodwill [member]      
IfrsStatementLineItems [Line Items]      
Intangible assets, beginning 35 35  
Increase    
Impairment [1]    
Decrease    
Translation effect    
Reclasification to assets clasified as held for sales    
Intangible assets 35 35  
Intangibles Identified In Acquisitions Of Companies [Member]      
IfrsStatementLineItems [Line Items]      
Intangible assets, beginning   7  
Impairment [1]    
Decrease    
Translation effect    
Reclasification to assets clasified as held for sales    
Intangible assets, ending 7    
Intangible assets amortization, beginning   (3)  
Impairment [1]    
Reclasification to assets clasified as held for sales    
Intangible assets amortization, ending (4)    
Depreciation for the year [2] (1)    
Intangible assets 3 4  
Other Intangible Asset [Member]      
IfrsStatementLineItems [Line Items]      
Intangible assets, beginning    
Increase 4    
Impairment [1]    
Decrease (4)    
Translation effect    
Reclasification to assets clasified as held for sales    
Intangible assets, ending    
[1] Considering the assumptions detailed in Note 11.1, the assessment of recoverability for the Power Generation segment, resulted in the recognition of impairment losses for the Diamante hydroelectric power plant in an amount of US$ 2 million in 2021, and the recognition of impairment losses for the Diamante and Nihuiles hydroelectric power plants in an amount of US$ 18 million in 2020
[2] It includes US$ 1 million corresponding to Discontinued operations for fiscal year 2020.