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Related party transactions (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Dec. 31, 2023
IfrsStatementLineItems [Line Items]          
Assets $ 190,449   $ 190,449   $ 217,067
Liabilities 122,801   122,801   138,092
Income (Expense) 644 $ 650 1,523 $ 1,448  
Transactions With Joint Ventures Associates Government Entities And Pension Plans [Member]          
IfrsStatementLineItems [Line Items]          
Assets 14,688   14,688   17,965
Liabilities 3,683   3,683   3,924
Current Assets Or Current Liabilities [Member]          
IfrsStatementLineItems [Line Items]          
Assets 1,978   1,978   2,684
Liabilities 1,216   1,216   1,676
Non Current Assets Or Non Current Liabilities [Member]          
IfrsStatementLineItems [Line Items]          
Assets 12,710   12,710   15,281
Liabilities 2,467   2,467   2,248
Purchases And Services [Member]          
IfrsStatementLineItems [Line Items]          
Income (Expense) 3 2 6 4  
Income Expenses [Member]          
IfrsStatementLineItems [Line Items]          
Income (Expense) (196) (94) (201) (242)  
Foreign Exchange And Inflation Indexation Charges Net [Member]          
IfrsStatementLineItems [Line Items]          
Income (Expense) (113) (171) (140) (214)  
Net Finance Income Expense [Member]          
IfrsStatementLineItems [Line Items]          
Income (Expense) 51 93 118 186  
Petros [Member]          
IfrsStatementLineItems [Line Items]          
Assets 49   49   64
Liabilities 251   251   305
Income (Expense) (5) (5) (10) (9)  
Revenues Mainly Sales Revenues [Member]          
IfrsStatementLineItems [Line Items]          
Income (Expense) 899 820 1,740 1,714  
Government Bonds [Member]          
IfrsStatementLineItems [Line Items]          
Assets 1,223   1,223   1,819
Income (Expense) 38 54 84 107  
Banks Controlled By The Brazilian Government [Member]          
IfrsStatementLineItems [Line Items]          
Assets 13,089   13,089   15,526
Liabilities 2,304   2,304   2,119
Income (Expense) (5) (24) 11 (18)  
Petroleum And Alcohol Account Receivable From The Brazilian Government [Member]          
IfrsStatementLineItems [Line Items]          
Assets         278
Income (Expense) 3 17 7 28  
Brazilian Federal Government [Member]          
IfrsStatementLineItems [Line Items]          
Assets 2   2    
Liabilities 981   981   1,378
Income (Expense) (99) (125) (127) (142)  
P P S A [Member]          
IfrsStatementLineItems [Line Items]          
Liabilities 1   1   28
Income (Expense) (107) (23) (98) (133)  
Other Government Entities [Member]          
IfrsStatementLineItems [Line Items]          
Assets 132   132   138
Liabilities 106   106   80
Income (Expense) (83) (70) (93) (109)  
Other Associates And Joint Ventures [Member]          
IfrsStatementLineItems [Line Items]          
Assets 87   87   95
Liabilities 16   16   10
Income (Expense) 9 11 29 20  
Joint Venture And Associates Sub Total [Member]          
IfrsStatementLineItems [Line Items]          
Assets 193   193   140
Liabilities 40   40   14
Income (Expense) 902 826 1,749 1,724  
Petrochemical Companies [Member]          
IfrsStatementLineItems [Line Items]          
Assets 106   106   45
Liabilities 24   24   4
Income (Expense) 893 815 1,720 1,704  
Government Entities Sub Total [Member]          
IfrsStatementLineItems [Line Items]          
Assets 14,446   14,446   17,761
Liabilities 3,392   3,392   $ 3,605
Income (Expense) $ (253) $ (171) $ (216) $ (267)