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Related-party transactions (Details) - USD ($)
$ in Millions
Dec. 31, 2022
Dec. 31, 2021
IfrsStatementLineItems [Line Items]    
Assets $ 187,191 $ 174,348
Liabilities 117,355 104,536
Transactions With Joint Ventures Associates Government Entities And Pension Plans [Member]    
IfrsStatementLineItems [Line Items]    
Assets 14,309 10,833
Liabilities 3,449 1,449
Current Assets Or Current Liabilities [Member]    
IfrsStatementLineItems [Line Items]    
Assets 2,603 2,110
Liabilities 2,119 315
Non Current Assets Or Non Current Liabilities [Member]    
IfrsStatementLineItems [Line Items]    
Assets 11,706 8,723
Liabilities 1,330 1,134
Petros [Member]    
IfrsStatementLineItems [Line Items]    
Assets 56 51
Liabilities 301 61
Government bonds [member]    
IfrsStatementLineItems [Line Items]    
Assets 1,689 1,446
Banks Controlled By The Brazilian Government [Member]    
IfrsStatementLineItems [Line Items]    
Assets 11,811 8,417
Liabilities 1,567 1,267
Petroleum And Alcohol Account Receivable From The Brazilian Government [Member]    
IfrsStatementLineItems [Line Items]    
Assets 602 506
P P S A [Member]    
IfrsStatementLineItems [Line Items]    
Liabilities   57
Other Government Entities [Member]    
IfrsStatementLineItems [Line Items]    
Assets 58 26
Liabilities 71 54
Other Associates And Joint Ventures [Member]    
IfrsStatementLineItems [Line Items]    
Assets 72 104
Joint Venture And Associates Sub Total [Member]    
IfrsStatementLineItems [Line Items]    
Assets 93 385
Liabilities 31 67
State Controlled Gas Distributors Joint Ventures [Member]    
IfrsStatementLineItems [Line Items]    
Assets   255
Liabilities   42
Petrochemical Companies [Member]    
IfrsStatementLineItems [Line Items]    
Assets 21 26
Liabilities 10 12
Other Associates And Joint Ventures [Member]    
IfrsStatementLineItems [Line Items]    
Liabilities 21 13
Petrobras Distribuidora [Member]    
IfrsStatementLineItems [Line Items]    
Assets   2
Liabilities 1,422  
Government Entities Sub Total [Member]    
IfrsStatementLineItems [Line Items]    
Assets 14,160 10,397
Liabilities $ 3,117 $ 1,321