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Schedule of financial assets at amortized cost (Details) - USD ($)
$ in Millions
Dec. 31, 2021
Dec. 31, 2020
IfrsStatementLineItems [Line Items]    
Non current financial assets at amortized cost $ 105 $ 100
Current financial assets at amortized cost 5 25
Term Deposits [Member]    
IfrsStatementLineItems [Line Items]    
Non current financial assets at amortized cost 100 100
Other Non Current [Member]    
IfrsStatementLineItems [Line Items]    
Non current financial assets at amortized cost 5
Public Securities [Member]    
IfrsStatementLineItems [Line Items]    
Current financial assets at amortized cost [1] 25
Other Current [Member]    
IfrsStatementLineItems [Line Items]    
Current financial assets at amortized cost $ 5
[1] Received in accordance with the mechanism set forth by SE Resolution No. 54/19 for the settlement of receivables under Natural Gas Surplus Injection Promotion Programs.