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Related-party transactions (Details) - USD ($)
$ in Millions
Dec. 31, 2023
Dec. 31, 2022
IfrsStatementLineItems [Line Items]    
Assets $ 217,067 $ 187,191
Liabilities 138,092 117,355
Transactions With Joint Ventures Associates Government Entities And Pension Plans [Member]    
IfrsStatementLineItems [Line Items]    
Assets 17,965 14,309
Liabilities 3,924 3,449
Current Assets Or Current Liabilities [Member]    
IfrsStatementLineItems [Line Items]    
Assets 2,684 2,603
Liabilities 1,676 2,119
Non Current Assets Or Non Current Liabilities [Member]    
IfrsStatementLineItems [Line Items]    
Assets 15,281 11,706
Liabilities 2,248 1,330
Petros [Member]    
IfrsStatementLineItems [Line Items]    
Assets 64 56
Liabilities 305 301
Government bonds [member]    
IfrsStatementLineItems [Line Items]    
Assets 1,819 1,689
Banks Controlled By The Brazilian Government [Member]    
IfrsStatementLineItems [Line Items]    
Assets 15,526 11,811
Liabilities 2,119 1,567
Petroleum And Alcohol Account Receivable From The Brazilian Government [Member]    
IfrsStatementLineItems [Line Items]    
Assets 278 602
Brazilian Federal Government [Member]    
IfrsStatementLineItems [Line Items]    
Liabilities 1,378 1,422
P P S A [Member]    
IfrsStatementLineItems [Line Items]    
Liabilities 28 57
Other Government Entities [Member]    
IfrsStatementLineItems [Line Items]    
Assets 138 58
Liabilities 80 71
Other Associates And Joint Ventures [Member]    
IfrsStatementLineItems [Line Items]    
Assets 95 72
Liabilities 10 21
Joint Venture And Associates Sub Total [Member]    
IfrsStatementLineItems [Line Items]    
Assets 140 93
Liabilities 14 31
Petrochemical Companies [Member]    
IfrsStatementLineItems [Line Items]    
Assets 45 21
Liabilities 4 10
Government Entities Sub Total [Member]    
IfrsStatementLineItems [Line Items]    
Assets 17,761 14,160
Liabilities $ 3,605 $ 3,117