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Impairment (Details 6) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
IfrsStatementLineItems [Line Items]      
Impairment (losses) reversals $ 2,680 $ 1,315 $ (3,190)
Impairment (losses) reversals 104 (151) (225)
Producing Properties Relating To Oil And Gas Activities Country Of Brazil [Member]      
IfrsStatementLineItems [Line Items]      
Carrying amount 230 376  
Recoverable amount 334 300  
Impairment (losses) reversals $ 103 $ (116)  
Business segment E&P E&P  
Others [Member]      
IfrsStatementLineItems [Line Items]      
Impairment (losses) reversals $ 1 $ 9 $ 4
Business segment Several Several Several
Refineries And Associated Logistics Assets [Member]      
IfrsStatementLineItems [Line Items]      
Carrying amount   $ 77 $ 255
Recoverable amount   34 218
Impairment (losses) reversals   $ (44) $ (37)
Business segment   RT&M RT&M
Thermoelectric Power Plants [Member]      
IfrsStatementLineItems [Line Items]      
Carrying amount     $ 91
Recoverable amount     12
Impairment (losses) reversals     $ (79)
Business segment     G&LCE
Investments In Associates And Joint Ventures [Member]      
IfrsStatementLineItems [Line Items]      
Carrying amount     $ 107
Recoverable amount     44
Impairment (losses) reversals     $ (67)
Business segment     G&LCE
Oil And Gas Production And Drilling Equipment [Member]      
IfrsStatementLineItems [Line Items]      
Carrying amount     $ 47
Impairment (losses) reversals     $ (46)
Business segment     E&P