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Schedule of revenue (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
IfrsStatementLineItems [Line Items]
Revenue		$ 1,508	$ 1,073	$ 1,340
Generation [Member]
IfrsStatementLineItems [Line Items]
Revenue		656	559	819
Generation [Member] | Sales Of Energy To The S P O T Market [Member]
IfrsStatementLineItems [Line Items]
Revenue	[1]	167	179	249
Generation [Member] | Sales Of Energy By Contract [Member]
IfrsStatementLineItems [Line Items]
Revenue		380	323	285
Generation [Member] | Fuel Supply [Member]
IfrsStatementLineItems [Line Items]
Revenue		104	54	282
Generation [Member] | Other Sales [Member]
IfrsStatementLineItems [Line Items]
Revenue		5	3	3
Oil And Gas Segment [Member]
IfrsStatementLineItems [Line Items]
Revenue		340	227	178
Oil And Gas Segment [Member] | Other Sales [Member]
IfrsStatementLineItems [Line Items]
Revenue		10	10	7
Oil And Gas Segment [Member] | Oil Gas And Liquid Sales [Member]
IfrsStatementLineItems [Line Items]
Revenue		330	217	171
Petrochemicals [Member]
IfrsStatementLineItems [Line Items]
Revenue		490	267	323
Petrochemicals [Member] | Petrochemicals Sales [Member]
IfrsStatementLineItems [Line Items]
Revenue		490	267	323
Holding And Others [Member]
IfrsStatementLineItems [Line Items]
Revenue		22	20	20
Holding And Others [Member] | Administrative Services Sales [Member]
IfrsStatementLineItems [Line Items]
Revenue		$ 22	$ 20	$ 20
[1] As of December 31, 2019, includes US$ 5.9 million related to the agreement for the regularization and settlement of receivables executed with the WEM on August 5, 2019.

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The income arising in the course of an entity's ordinary activities. Income is increases in assets, or decreases in liabilities, that result in increases in equity, other than those relating to contributions from holders of equity claims.

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