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Related-party transactions (Details) - USD ($)
$ in Millions
Dec. 31, 2024
Dec. 31, 2023
IfrsStatementLineItems [Line Items]    
Assets $ 181,645 $ 217,067
Liabilities 122,295 138,092
Transactions With Joint Ventures Associates Government Entities And Pension Plans [Member]    
IfrsStatementLineItems [Line Items]    
Assets 13,540 17,965
Liabilities 4,135 3,924
Current [member]    
IfrsStatementLineItems [Line Items]    
Assets 1,557 2,684
Liabilities 1,382 1,676
Non Current [Member]    
IfrsStatementLineItems [Line Items]    
Assets 11,983 15,281
Liabilities 2,753 2,248
Petros [Member]    
IfrsStatementLineItems [Line Items]    
Assets 44 64
Liabilities 234 305
Government bonds [member]    
IfrsStatementLineItems [Line Items]    
Assets 1,114 1,819
Banks Controlled By The Brazilian Government [Member]    
IfrsStatementLineItems [Line Items]    
Assets 12,030 15,526
Liabilities 2,675 2,119
Petroleum And Alcohol Account Receivable From The Brazilian Government [Member]    
IfrsStatementLineItems [Line Items]    
Assets   278
Brazilian Federal Government [Member]    
IfrsStatementLineItems [Line Items]    
Liabilities 1,046 1,378
PPSA [Member]    
IfrsStatementLineItems [Line Items]    
Liabilities 79 28
Other Government Entities [Member]    
IfrsStatementLineItems [Line Items]    
Assets 235 138
Liabilities 85 80
Other Associates And Joint Ventures [Member]    
IfrsStatementLineItems [Line Items]    
Assets 52 95
Liabilities 15 10
Joint Venture And Associates Sub Total [Member]    
IfrsStatementLineItems [Line Items]    
Assets 117 140
Liabilities 16 14
Petrochemical Companies [Member]    
IfrsStatementLineItems [Line Items]    
Assets 65 45
Liabilities 1 4
Government Entities Sub Total [Member]    
IfrsStatementLineItems [Line Items]    
Assets 13,379 17,761
Liabilities $ 3,885 $ 3,605