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Disposal of assets and other transactions (Details 1)
$ in Millions
 6 Months Ended
Jun. 30, 2024
USD ($)
IfrsStatementLineItems [Line Items]  
Contingent assets at the closing date $ 6,953
Assets recognized in previous periods 1,720
Contingent assets 4,865
Assets recognized $ 368
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 closing date $ 62
Assets recognized in previous periods 58
Contingent assets $ 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 closing date $ 650
Assets recognized in previous periods 246
Contingent assets 383
Assets recognized $ 21
Transaction Contingent Assets Three [Member]  
IfrsStatementLineItems [Line Items]  
Riacho da Forquilha group of fields Baúna field
Closing date November 2020
Contingent assets at the closing date $ 285
Assets recognized in previous periods 196
Contingent assets 41
Assets recognized $ 48
Transaction Contingent Assets Four [Member]  
IfrsStatementLineItems [Line Items]  
Riacho da Forquilha group of fields Miranga cluster
Closing date December 2021
Contingent assets at the closing date $ 85
Assets recognized in previous periods 70
Assets recognized $ 15
Transaction Contingent Assets Five [Member]  
IfrsStatementLineItems [Line Items]  
Riacho da Forquilha group of fields Cricare cluster
Closing date December 2021
Contingent assets at the closing date $ 118
Assets recognized in previous periods 76
Contingent assets $ 42
Transaction Contingent Assets Six [Member]  
IfrsStatementLineItems [Line Items]  
Riacho da Forquilha group of fields Peroá cluster
Closing date August 2022
Contingent assets at the closing date $ 43
Assets recognized in previous periods 10
Contingent assets $ 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 closing date $ 90
Assets recognized in previous periods 16
Contingent assets 58
Assets recognized $ 16
Transaction Contingent Assets Eighth [Member]  
IfrsStatementLineItems [Line Items]  
Riacho da Forquilha group of fields Albacora Leste field
Transaction Contingent Assets Eight [Member]  
IfrsStatementLineItems [Line Items]  
Closing date January 2023
Contingent assets at the closing date $ 250
Assets recognized in previous periods 58
Contingent assets 25
Assets recognized $ 167
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 closing date $ 66
Assets recognized in previous periods 22
Contingent assets $ 44
Transaction Contingent Assets Ten [Member]  
IfrsStatementLineItems [Line Items]  
Riacho da Forquilha group of fields Golfinho and Camarupim clusters
Closing date August 2023
Contingent assets at the closing date $ 60
Assets recognized in previous periods 20
Contingent assets $ 40
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 closing date $ 5,244
Assets recognized in previous periods 948
Contingent assets 4,195
Assets recognized $ 101