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Schedule of contingent asset from disposal investments (Details) - USD ($)
$ in Millions
 6 Months Ended 12 Months Ended
Jun. 30, 2022
Dec. 31, 2021
DisclosureInvestmentsLineItems [Line Items]    
Assets recognized $ 281 $ 111
Riacho of forquilha group [member]    
DisclosureInvestmentsLineItems [Line Items]    
Closing date 2019-12  
Amounts subject to recognition $ 62  
Assets recognized $ 8  
Pampo And Enchova Group [Member]    
DisclosureInvestmentsLineItems [Line Items]    
Closing date 2020-07  
Amounts subject to recognition $ 650  
Assets recognized $ 125 36
Bauna Field [Member]    
DisclosureInvestmentsLineItems [Line Items]    
Closing date 2020-11  
Amounts subject to recognition $ 285  
Assets recognized $ 95 17
Frade Fielda Group [Member]    
DisclosureInvestmentsLineItems [Line Items]    
Closing date 2021-02  
Amounts subject to recognition $ 20  
Ventura Group [Member]    
DisclosureInvestmentsLineItems [Line Items]    
Closing date 2021-07  
Amounts subject to recognition $ 43  
Assets recognized   43
Miranga Group [Member]    
DisclosureInvestmentsLineItems [Line Items]    
Closing date 2021-12  
Amounts subject to recognition $ 85  
Assets recognized $ 33 $ 15
Cricare Group [Member]    
DisclosureInvestmentsLineItems [Line Items]    
Closing date 2021-12  
Amounts subject to recognition $ 118  
Assets recognized $ 20