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Related party transactions (Details) - USD ($)
$ in Millions
Jun. 30, 2025
Dec. 31, 2024
IfrsStatementLineItems [Line Items]    
Assets $ 215,296 $ 181,645
Liabilities 141,668 122,295
Transactions With Joint Ventures Associates Government Entities And Pension Plans [Member]    
IfrsStatementLineItems [Line Items]    
Assets 16,272 13,540
Liabilities 5,555 4,135
Current [member]    
IfrsStatementLineItems [Line Items]    
Assets 1,747 1,557
Liabilities 1,186 1,382
Non Current [Member]    
IfrsStatementLineItems [Line Items]    
Assets 14,525 11,983
Liabilities 4,369 2,753
Petros [Member]    
IfrsStatementLineItems [Line Items]    
Assets 51 44
Liabilities 266 234
Government Bonds [Member]    
IfrsStatementLineItems [Line Items]    
Assets 716 1,114
Banks Controlled By The Brazilian Government [Member]    
IfrsStatementLineItems [Line Items]    
Assets 15,163 12,030
Liabilities 4,261 2,675
Brazilian Federal Government [Member]    
IfrsStatementLineItems [Line Items]    
Liabilities 883 1,046
P P S A [Member]    
IfrsStatementLineItems [Line Items]    
Liabilities 25 79
Other Government Entities [Member]    
IfrsStatementLineItems [Line Items]    
Assets 185 235
Liabilities 101 85
Other Associates And Joint Ventures [Member]    
IfrsStatementLineItems [Line Items]    
Assets 86 52
Liabilities 12 15
Joint Venture And Associates Sub Total [Member]    
IfrsStatementLineItems [Line Items]    
Assets 157 117
Liabilities 19 16
Petrochemical Companies [Member]    
IfrsStatementLineItems [Line Items]    
Assets 71 65
Liabilities 7 1
Government Entities Sub Total [Member]    
IfrsStatementLineItems [Line Items]    
Assets 16,064 13,379
Liabilities $ 5,270 $ 3,885