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Disposal of assets and other transactions (Details 3)
$ in Millions
 12 Months Ended
Dec. 31, 2023
USD ($)
IfrsStatementLineItems [Line Items]  
Cash received $ 624
Cash in subsidiary before losing control (44)
Net Proceeds 580
Gaspetro M [Member]  
IfrsStatementLineItems [Line Items]  
Cash received 391
Cash in subsidiary before losing control (22)
Net Proceeds 369
R E M A N [Member]  
IfrsStatementLineItems [Line Items]  
Cash received 233
Cash in subsidiary before losing control (22)
Net Proceeds $ 211