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Related-party transactions (Details 1) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
IfrsStatementLineItems [Line Items]      
Income (Expense) $ 3,190 $ 5,625 $ 13,963
Transactions With Joint Ventures Associates Government Entities And Pension Plans [Member]      
IfrsStatementLineItems [Line Items]      
Income (Expense) 3,190 5,625 13,963
Purchases And Services [Member]      
IfrsStatementLineItems [Line Items]      
Income (Expense) 12 (4) (494)
Income Expenses [Member]      
IfrsStatementLineItems [Line Items]      
Income (Expense) (582) (804) (315)
Foreign Exchange And Inflation Indexation Charges Net [Member]      
IfrsStatementLineItems [Line Items]      
Income (Expense) (267) 299 (59)
Net Finance Income Expense [Member]      
IfrsStatementLineItems [Line Items]      
Income (Expense) 577 313 159
Petros [Member]      
IfrsStatementLineItems [Line Items]      
Income (Expense) (19) (21)  
Revenues Mainly Sales Revenues [Member]      
IfrsStatementLineItems [Line Items]      
Income (Expense) 3,450 5,821 14,672
Government bonds [member]      
IfrsStatementLineItems [Line Items]      
Income (Expense) 210 204 64
Banks Controlled By The Brazilian Government [Member]      
IfrsStatementLineItems [Line Items]      
Income (Expense) (19) 71 (157)
Receivable From The Electricity Sector [Member]      
IfrsStatementLineItems [Line Items]      
Income (Expense) 233   131
Petroleum And Alcohol Account Receivable From The Brazilian Government [Member]      
IfrsStatementLineItems [Line Items]      
Income (Expense) 15 62 58
Brazilian Federal Government Dividends [Member]      
IfrsStatementLineItems [Line Items]      
Income (Expense) (124) 288 31
Empresa Brasileira De Administrao De Petrleo Gs Natural Pr Sal Petrleo [Member]      
IfrsStatementLineItems [Line Items]      
Income (Expense) (361) (657) (139)
Other Government Entities [Member]      
IfrsStatementLineItems [Line Items]      
Income (Expense) (204) (79) (34)
Other Associates And Joint Ventures [Member]      
IfrsStatementLineItems [Line Items]      
Income (Expense) 57 96 418
Joint Venture And Associates Sub Total [Member]      
IfrsStatementLineItems [Line Items]      
Income (Expense) 3,459 5,757 14,009
B R Distribuidora [Member]      
IfrsStatementLineItems [Line Items]      
Income (Expense)     7,936
Natural Gas Transportation Companies [Member]      
IfrsStatementLineItems [Line Items]      
Income (Expense)     (308)
State Controlled Gas Distributors Joint Ventures [Member]      
IfrsStatementLineItems [Line Items]      
Income (Expense)   1,196 2,410
Petrobras Distribuidora [Member]      
IfrsStatementLineItems [Line Items]      
Income (Expense) 3,402 4,465 3,553
Government Entities Sub Total [Member]      
IfrsStatementLineItems [Line Items]      
Income (Expense) $ (250) $ (111) $ (46)