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REVENUE (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
IfrsStatementLineItems [Line Items]      
Revenue $ 1,829 $ 1,508 $ 1,073
Generation [Member]      
IfrsStatementLineItems [Line Items]      
Revenue 663 656 559
Generation [Member] | Sales Of Energy To The S P O T Market [Member]      
IfrsStatementLineItems [Line Items]      
Revenue 210 167 179
Generation [Member] | Sales Of Energy By Contract [Member]      
IfrsStatementLineItems [Line Items]      
Revenue 346 380 323
Generation [Member] | Fuel Supply [Member]      
IfrsStatementLineItems [Line Items]      
Revenue 103 104 54
Generation [Member] | Other Sales [Member]      
IfrsStatementLineItems [Line Items]      
Revenue 4 5 3
Oil And Gas Segment [Member]      
IfrsStatementLineItems [Line Items]      
Revenue 529 340 227
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 383 231 152
Oil And Gas Segment [Member] | Oil Sales [Member]      
IfrsStatementLineItems [Line Items]      
Revenue 136 99 65
Petrochemicals [Member]      
IfrsStatementLineItems [Line Items]      
Revenue 617 490 267
Petrochemicals [Member] | Other Sales [Member]      
IfrsStatementLineItems [Line Items]      
Revenue 4 3 7
Petrochemicals [Member] | Products From Catalytic Reforming Sales [Member]      
IfrsStatementLineItems [Line Items]      
Revenue 270 185 98
Petrochemicals [Member] | Styrene Sales [Member]      
IfrsStatementLineItems [Line Items]      
Revenue 96 84 42
Petrochemicals [Member] | Synthetic Rubber Sales [Member]      
IfrsStatementLineItems [Line Items]      
Revenue 106 99 49
Petrochemicals [Member] | Polystyrene Sales [Member]      
IfrsStatementLineItems [Line Items]      
Revenue 141 119 71
Holding And Others [Member]      
IfrsStatementLineItems [Line Items]      
Revenue 20 22 20
Holding And Others [Member] | Technical Assistance And Administration Services Sales [Member]      
IfrsStatementLineItems [Line Items]      
Revenue 20 22 20
Holding And Others [Member] | Other [Member]      
IfrsStatementLineItems [Line Items]      
Revenue