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Disposal of assets and other transactions (Details 2)
$ in Millions
 12 Months Ended
Dec. 31, 2023
USD ($)
IfrsStatementLineItems [Line Items]  
Contingent assets at the ending $ 6,953
Assets recognized 137
Assets recognized in previous periods 1,135
Contingent assets at the beginning $ 5,681
Transaction Contingent Assets One [Member]  
IfrsStatementLineItems [Line Items]  
Riacho da Forquilha group of fields Riacho da Forquilha cluster
Closing date December 2019
Contingent assets at the ending $ 62
Assets recognized 30
Assets recognized in previous periods 28
Contingent assets at the beginning $ 4
Transaction Contingent Assets Two [Member]  
IfrsStatementLineItems [Line Items]  
Riacho da Forquilha group of fields Pampo and Enchova cluster
Closing date July 2020
Contingent assets at the ending $ 650
Assets recognized 15
Assets recognized in previous periods 180
Contingent assets at the beginning $ 455
Transaction Contingent Assets Three [Member]  
IfrsStatementLineItems [Line Items]  
Riacho da Forquilha group of fields Baúna field
Closing date November 2020
Contingent assets at the ending $ 285
Assets recognized 27
Assets recognized in previous periods 132
Contingent assets at the beginning $ 126
Transaction Contingent Assets Four [Member]  
IfrsStatementLineItems [Line Items]  
Riacho da Forquilha group of fields Miranga cluster
Closing date December 2021
Contingent assets at the ending $ 85
Assets recognized in previous periods 55
Contingent assets at the beginning $ 30
Transaction Contingent Assets Five [Member]  
IfrsStatementLineItems [Line Items]  
Riacho da Forquilha group of fields Cricare cluster
Closing date December 2021
Contingent assets at the ending $ 118
Assets recognized in previous periods 22
Contingent assets at the beginning $ 96
Transaction Contingent Assets Six [Member]  
IfrsStatementLineItems [Line Items]  
Riacho da Forquilha group of fields Peroá cluster
Closing date August 2022
Contingent assets at the ending $ 43
Assets recognized in previous periods 10
Contingent assets at the beginning $ 33
Transaction Contingent Assets Seven [Member]  
IfrsStatementLineItems [Line Items]  
Riacho da Forquilha group of fields Papa-Terra field
Closing date December 2022
Contingent assets at the ending $ 90
Assets recognized 1
Assets recognized in previous periods 15
Contingent assets at the beginning $ 74
Transaction Contingent Assets Eighth [Member]  
IfrsStatementLineItems [Line Items]  
Riacho da Forquilha group of fields Albacora Leste field
Closing date January 2023
Contingent assets at the ending $ 250
Assets recognized 10
Contingent assets at the beginning $ 240
Transaction Contingent Assets Nine [Member]  
IfrsStatementLineItems [Line Items]  
Riacho da Forquilha group of fields Norte Capixaba cluster
Closing date April 2023
Contingent assets at the ending $ 66
Assets recognized 11
Contingent assets at the beginning $ 55
Transaction Contingent Assets Ten [Member]  
IfrsStatementLineItems [Line Items]  
Riacho da Forquilha group of fields Golfinho and Camarupim groups of fields
Closing date August 2023
Contingent assets at the ending $ 60
Contingent assets at the beginning $ 60
Transaction Contingent Assets Eleven [Member]  
IfrsStatementLineItems [Line Items]  
Riacho da Forquilha group of fields Sepia and Atapu
Closing date April 2022
Contingent assets at the ending $ 5,244
Assets recognized 43
Assets recognized in previous periods 693
Contingent assets at the beginning $ 4,508