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REVENUE (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
IfrsStatementLineItems [Line Items]      
Revenue $ 1,732 $ 1,829 $ 1,508
Generation [Member]      
IfrsStatementLineItems [Line Items]      
Revenue 648 663 656
Generation [Member] | Sales Of Energy To The S P O T Market [Member]      
IfrsStatementLineItems [Line Items]      
Revenue 196 210 167
Generation [Member] | Sales Of Energy By Contract [Member]      
IfrsStatementLineItems [Line Items]      
Revenue 363 346 380
Generation [Member] | Fuel Supply [Member]      
IfrsStatementLineItems [Line Items]      
Revenue 87 103 104
Generation [Member] | Other Sales [Member]      
IfrsStatementLineItems [Line Items]      
Revenue 2 4 5
Oil And Gas Segment [Member]      
IfrsStatementLineItems [Line Items]      
Revenue 563 529 340
Oil And Gas Segment [Member] | Other Sales [Member]      
IfrsStatementLineItems [Line Items]      
Revenue 10 10 10
Oil And Gas Segment [Member] | Gas Sales [Member]      
IfrsStatementLineItems [Line Items]      
Revenue 432 383 231
Oil And Gas Segment [Member] | Oil Sales [Member]      
IfrsStatementLineItems [Line Items]      
Revenue 121 136 99
Petrochemicals [Member]      
IfrsStatementLineItems [Line Items]      
Revenue 507 617 490
Petrochemicals [Member] | Other Sales [Member]      
IfrsStatementLineItems [Line Items]      
Revenue 2 4 3
Petrochemicals [Member] | Products From Catalytic Reforming Sales [Member]      
IfrsStatementLineItems [Line Items]      
Revenue 217 270 185
Petrochemicals [Member] | Styrene Sales [Member]      
IfrsStatementLineItems [Line Items]      
Revenue 79 96 84
Petrochemicals [Member] | Synthetic Rubber Sales [Member]      
IfrsStatementLineItems [Line Items]      
Revenue 78 106 99
Petrochemicals [Member] | Polystyrene Sales [Member]      
IfrsStatementLineItems [Line Items]      
Revenue 131 141 119
Holding And Others [Member]      
IfrsStatementLineItems [Line Items]      
Revenue 14 20 22
Holding And Others [Member] | Technical Assistance And Administration Services Sales [Member]      
IfrsStatementLineItems [Line Items]      
Revenue 14 20 22
Holding And Others [Member] | Other [Member]      
IfrsStatementLineItems [Line Items]      
Revenue