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Impairment (Details 5) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Assets With Impairment Losses [Member]    
IfrsStatementLineItems [Line Items]    
Carrying amount $ 7,242 $ 7,242
Recoverable amount 6,518 7,966
Sensitivity $ (724) $ 724
Producing Properties Relating To Oil And Gas Activities Country Of Brazil [Member]    
IfrsStatementLineItems [Line Items]    
Business segment E&P E&P
Carrying amount $ 230 $ 376
Recoverable amount $ 334 $ 300
Producing Properties Relating To Oil And Gas Activities Country Of Brazil [Member] | Assets With Impairment Losses [Member]    
IfrsStatementLineItems [Line Items]    
Business segment E&P E&P
Carrying amount   $ 5,863
Recoverable amount   6,449
Sensitivity   $ 586
C G U Marlim Sul [Member] | Producing Properties Relating To Oil And Gas Activities Country Of Brazil [Member]    
IfrsStatementLineItems [Line Items]    
Carrying amount $ 5,863  
Recoverable amount 5,277  
Sensitivity $ (586)  
Second Refining Unit Of R N E S T [Member] | Assets With Impairment Losses [Member]    
IfrsStatementLineItems [Line Items]    
Business segment RT&M RT&M
Carrying amount $ 455 $ 455
Recoverable amount 409 501
Sensitivity $ (46) $ 46
Itaborai Utilities [Member] | Assets With Impairment Losses [Member]    
IfrsStatementLineItems [Line Items]    
Business segment G&LCE G&LCE
Carrying amount $ 924 $ 924
Recoverable amount 832 1,016
Sensitivity $ (92) $ 92