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Related-party transactions (Details 1) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
IfrsStatementLineItems [Line Items]      
Income (expense) $ 2,722 $ 3,190 $ 5,625
Transactions With Joint Ventures Associates Government Entities And Pension Plans [Member]      
IfrsStatementLineItems [Line Items]      
Income (expense) 2,722 3,190 5,625
Revenues Mainly Sales Revenues [Member]      
IfrsStatementLineItems [Line Items]      
Income (expense) 3,536 3,450 5,821
Purchases And Services [Member]      
IfrsStatementLineItems [Line Items]      
Income (expense) 15 12 (4)
Income Expenses [Member]      
IfrsStatementLineItems [Line Items]      
Income (expense) (871) (582) (804)
Foreign Exchange And Inflation Indexation Charges Net [Member]      
IfrsStatementLineItems [Line Items]      
Income (expense) (105) (267) 299
Net Finance Income Expense [Member]      
IfrsStatementLineItems [Line Items]      
Income (expense) 147 577 313
Petros [Member]      
IfrsStatementLineItems [Line Items]      
Income (expense) (19) (19) (21)
Government bonds [member]      
IfrsStatementLineItems [Line Items]      
Income (expense) 145 210 204
Banks Controlled By The Brazilian Government [Member]      
IfrsStatementLineItems [Line Items]      
Income (expense)   (19) 71
Receivable From The Electricity Sector [Member]      
IfrsStatementLineItems [Line Items]      
Income (expense)   233  
Petroleum And Alcohol Account Receivable From The Brazilian Government [Member]      
IfrsStatementLineItems [Line Items]      
Income (expense) 7 15 62
Brazilian Federal Government Dividends [Member]      
IfrsStatementLineItems [Line Items]      
Income (expense) (112) (124) 288
Empresa Brasileira De Administrao De Petrleo Gs Natural Pr Sal Petrleo [Member]      
IfrsStatementLineItems [Line Items]      
Income (expense) (599) (361) (657)
Other Government Entities [Member]      
IfrsStatementLineItems [Line Items]      
Income (expense) (255) (204) (79)
Other Associates And Joint Ventures [Member]      
IfrsStatementLineItems [Line Items]      
Income (expense) 50 57 96
Joint Venture And Associates Sub Total [Member]      
IfrsStatementLineItems [Line Items]      
Income (expense) 3,555 3,459 5,757
State Controlled Gas Distribuidora [Member]      
IfrsStatementLineItems [Line Items]      
Income (expense)     1,196
Petrobras Distribuidora [Member]      
IfrsStatementLineItems [Line Items]      
Income (expense) 3,505 3,402 4,465
Government Entities Sub Total [Member]      
IfrsStatementLineItems [Line Items]      
Income (expense) $ (814) $ (250) $ (111)