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Disposal of assets and other transactions (Details 4)
$ in Millions
12 Months Ended
Dec. 31, 2022
USD ($)
IfrsStatementLineItems [Line Items]  
Assets recognized $ 1,067
Assets recognized in previous periods $ 111
Transaction Contingent Assets One [Member]  
IfrsStatementLineItems [Line Items]  
Transaction Riacho da Forquilha group of fields
Closing date December 2019
Amounts subject to recognition $ 62
Assets recognized $ 28
Transaction Contingent Assets Two [Member]  
IfrsStatementLineItems [Line Items]  
Transaction Pampo and Enchova group of fields
Closing date July 2020
Amounts subject to recognition $ 650
Assets recognized 144
Assets recognized in previous periods $ 36
Transaction Contingent Assets Three [Member]  
IfrsStatementLineItems [Line Items]  
Transaction Baúna field
Closing date November 2020
Amounts subject to recognition $ 285
Assets recognized 115
Assets recognized in previous periods $ 17
Transaction Contingent Assets Four [Member]  
IfrsStatementLineItems [Line Items]  
Transaction Frade field
Closing date February 2021
Amounts subject to recognition $ 20
Transaction Contingent Assets Five [Member]  
IfrsStatementLineItems [Line Items]  
Transaction Ventura group of fields
Closing date July 2021
Amounts subject to recognition $ 43
Assets recognized in previous periods $ 43
Transaction Contingent Assets Six [Member]  
IfrsStatementLineItems [Line Items]  
Transaction Miranga group of fields
Closing date December 2021
Amounts subject to recognition $ 85
Assets recognized 40
Assets recognized in previous periods $ 15
Transaction Contingent Assets Seven [Member]  
IfrsStatementLineItems [Line Items]  
Transaction Cricare group of fields
Closing date December 2021
Amounts subject to recognition $ 118
Assets recognized $ 22
Transaction Contingent Assets Eight [Member]  
IfrsStatementLineItems [Line Items]  
Transaction Peroá group of fields
Closing date August 2022
Amounts subject to recognition $ 43
Assets recognized $ 10
Transaction Contingent Assets Nine [Member]  
IfrsStatementLineItems [Line Items]  
Transaction Papa-Terra field
Closing date December 2022
Amounts subject to recognition $ 90
Assets recognized $ 15
Transaction Contingent Assets Ten [Member]  
IfrsStatementLineItems [Line Items]  
Transaction Sepia and Atapu (*)
Closing date April 2022
Amounts subject to recognition $ 5,244
Assets recognized $ 693