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REVENUE (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
IfrsStatementLineItems [Line Items]      
Revenue $ 1,876 $ 1,732 $ 1,829
Oil And Gas Segment [Member]      
IfrsStatementLineItems [Line Items]      
Revenue 623 563 529
Oil And Gas Segment [Member] | Gas Sales [Member]      
IfrsStatementLineItems [Line Items]      
Revenue 485 432 383
Oil And Gas Segment [Member] | Oil Sales [Member]      
IfrsStatementLineItems [Line Items]      
Revenue 127 121 136
Oil And Gas Segment [Member] | Other Sales [Member]      
IfrsStatementLineItems [Line Items]      
Revenue 11 10 10
Generation [Member]      
IfrsStatementLineItems [Line Items]      
Revenue 672 648 663
Generation [Member] | Other Sales [Member]      
IfrsStatementLineItems [Line Items]      
Revenue 8 2 4
Generation [Member] | Sales Of Energy To The S P O T Market [Member]      
IfrsStatementLineItems [Line Items]      
Revenue 206 196 210
Generation [Member] | Sales Of Energy By Contract [Member]      
IfrsStatementLineItems [Line Items]      
Revenue 356 363 346
Generation [Member] | Fuel Supply [Member]      
IfrsStatementLineItems [Line Items]      
Revenue 102 87 103
Petrochemicals [Member]      
IfrsStatementLineItems [Line Items]      
Revenue 516 507 617
Petrochemicals [Member] | Other Sales [Member]      
IfrsStatementLineItems [Line Items]      
Revenue 2 2 4
Petrochemicals [Member] | Products From Catalytic Reforming Sales [Member]      
IfrsStatementLineItems [Line Items]      
Revenue 277 217 270
Petrochemicals [Member] | Styrene Sales [Member]      
IfrsStatementLineItems [Line Items]      
Revenue 71 79 96
Petrochemicals [Member] | Synthetic Rubber Sales [Member]      
IfrsStatementLineItems [Line Items]      
Revenue 83 78 106
Petrochemicals [Member] | Polystyrene Sales [Member]      
IfrsStatementLineItems [Line Items]      
Revenue 83 131 141
Holding And Others [Member]      
IfrsStatementLineItems [Line Items]      
Revenue 65 14 20
Holding And Others [Member] | Technical Assistance And Administration Services Sales [Member]      
IfrsStatementLineItems [Line Items]      
Revenue 25 14 20
Holding And Others [Member] | Other [Member]      
IfrsStatementLineItems [Line Items]      
Revenue $ 40