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Related-party transactions (Details 1) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
IfrsStatementLineItems [Line Items]        
Income expense $ 650 $ 1,816 $ 1,448 $ 3,598
Revenues Mainly Sales Revenues [Member]        
IfrsStatementLineItems [Line Items]        
Income expense 820 2,019 1,714 3,800
Transactions With Joint Ventures Associates Government Entities And Pension Plans [Member]        
IfrsStatementLineItems [Line Items]        
Income expense 650 1,816 1,448 3,598
Purchases And Services [Member]        
IfrsStatementLineItems [Line Items]        
Income expense 2 1 4 5
Income Expenses [Member]        
IfrsStatementLineItems [Line Items]        
Income expense (94) (156) (242) (245)
Foreign Exchange And Inflation Indexation Charges Net [Member]        
IfrsStatementLineItems [Line Items]        
Income expense (171) (43) (214) (31)
Net Finance Income Expense [Member]        
IfrsStatementLineItems [Line Items]        
Income expense 93 (5) 186 69
Government Bonds [Member]        
IfrsStatementLineItems [Line Items]        
Income expense 54 51 107 93
Banks Controlled By The Brazilian Government [Member]        
IfrsStatementLineItems [Line Items]        
Income expense (24) (51) (18) (30)
Petroleum And Alcohol Account Receivable From The Brazilian Government [Member]        
IfrsStatementLineItems [Line Items]        
Income expense 17 27 28 46
Brazilian Federal Government Dividends [Member]        
IfrsStatementLineItems [Line Items]        
Income expense (125) (77) (142) (77)
Empresa Brasileira De Administrao De Petrleo Gs Natural Pr Sal Petrleo [Member]        
IfrsStatementLineItems [Line Items]        
Income expense (23) (132) (133) (171)
Other Government Entities [Member]        
IfrsStatementLineItems [Line Items]        
Income expense (70) (16) (109) (5)
Government Entities Sub Total [Member]        
IfrsStatementLineItems [Line Items]        
Income expense (171) (198) (267) (144)
Petros [Member]        
IfrsStatementLineItems [Line Items]        
Income expense (5)   (9)  
State Controlled Gas Distributors Joint Ventures [Member]        
IfrsStatementLineItems [Line Items]        
Income expense [1]   622   1,196
Petrochemical Companies [Member]        
IfrsStatementLineItems [Line Items]        
Income expense 815 1,332 1,704 2,457
Other Associates And Joint Ventures [Member]        
IfrsStatementLineItems [Line Items]        
Income expense 11 60 20 89
Joint Venture And Associates Sub Total [Member]        
IfrsStatementLineItems [Line Items]        
Income expense $ 826 $ 2,014 $ 1,724 $ 3,742
[1] In July 2022, the Company disposed its entire interest in Gaspetro.