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Summary of Balances of Significant Transactions (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Dec. 31, 2021
DisclosureRelatedartyTransactionsLineItems [Line Items]          
Assets $ 191,820   $ 191,820   $ 174,348
Liabilities 113,003   113,003   104,536
Assets 12,586   12,586   10,833
Liabilities 3,086   3,086   1,449
Income expense 1,816 $ 5,731 3,598 $ 10,004  
Transactions With Joint Ventures Associates Government Entities And Pension Plans [Member]          
DisclosureRelatedartyTransactionsLineItems [Line Items]          
Assets 12,586   12,586   10,833
Liabilities 3,086   3,086   1,449
Income expense 1,816 5,731 3,598 10,004  
Current Assets Or Current Liabilities [Member]          
DisclosureRelatedartyTransactionsLineItems [Line Items]          
Assets 2,678   2,678   2,110
Liabilities 2,039   2,039   315
Non Current Assets Or Non Current Liabilities [Member]          
DisclosureRelatedartyTransactionsLineItems [Line Items]          
Assets 9,908   9,908   8,723
Liabilities 1,047   1,047   1,134
Purchases And Services [Member]          
DisclosureRelatedartyTransactionsLineItems [Line Items]          
Income expense 1 (106) 5 (486)  
Income Expenses [Member]          
DisclosureRelatedartyTransactionsLineItems [Line Items]          
Income expense (156) (104) (245) (147)  
Foreign Exchange And Inflation Indexation Charges Net [Member]          
DisclosureRelatedartyTransactionsLineItems [Line Items]          
Income expense (43) (5) (31) (45)  
Net Finance Income Expense [Member]          
DisclosureRelatedartyTransactionsLineItems [Line Items]          
Income expense (5) 76 69 78  
Pension Plans [Member]          
DisclosureRelatedartyTransactionsLineItems [Line Items]          
Assets 57   57   51
Liabilities 32   32   61
Revenues Mainly Sales Revenues [Member]          
DisclosureRelatedartyTransactionsLineItems [Line Items]          
Income expense 2,019 5,870 3,800 10,604  
Government bonds [member]          
DisclosureRelatedartyTransactionsLineItems [Line Items]          
Assets 1,767   1,767   1,446
Income expense 51 13 93 20  
Banks Controlled By The Brazilian Government [Member]          
DisclosureRelatedartyTransactionsLineItems [Line Items]          
Assets 9,825   9,825   8,417
Liabilities 1,611   1,611   1,267
Income expense (51) (30) (30) (93)  
Petroleum and alcohol account receivable from the brazilian government [member]          
DisclosureRelatedartyTransactionsLineItems [Line Items]          
Assets 582   582   506
Income expense 27 11 46 22  
Brazilian Federal Government Dividends [Member]          
DisclosureRelatedartyTransactionsLineItems [Line Items]          
Liabilities 1,327   1,327    
Income expense (77) (4) (77) (4)  
Other Government Entities [Member]          
DisclosureRelatedartyTransactionsLineItems [Line Items]          
Assets 52   52   28
Liabilities 54   54   54
Income expense (16) (43) (5) (33)  
Receivable From The Electricity Sector [Member]          
DisclosureRelatedartyTransactionsLineItems [Line Items]          
Income expense   97   112  
Empresa Brasileira De Administrao De Petrleo Gs Natural Pr Sal Petrleo [Member]          
DisclosureRelatedartyTransactionsLineItems [Line Items]          
Income expense (132) (36) (171) (67)  
Government Entities Sub Total [Member]          
DisclosureRelatedartyTransactionsLineItems [Line Items]          
Income expense (198) 8 (144) (43)  
State Controlled Gas Distributors Joint Ventures [Member]          
DisclosureRelatedartyTransactionsLineItems [Line Items]          
Assets 205   205   255
Liabilities 51   51   42
Income expense 622 585 1,196 1,034  
Petrochemical Companies [Member]          
DisclosureRelatedartyTransactionsLineItems [Line Items]          
Assets 2   2   26
Liabilities 10   10   12
Income expense 1,332 822 2,457 1,590  
Other Associates And Joint Ventures [Member]          
DisclosureRelatedartyTransactionsLineItems [Line Items]          
Assets 96   96   104
Liabilities 1   1   13
Income expense 60 77 89 119  
Joint Venture And Associates Sub Total [Member]          
DisclosureRelatedartyTransactionsLineItems [Line Items]          
Assets 303   303   385
Liabilities 62   62   67
Income expense 2,014 5,723 3,742 10,047  
Brazilian government parent and its controlled entities [member]          
DisclosureRelatedartyTransactionsLineItems [Line Items]          
Assets 12,226   12,226   10,397
Liabilities $ 2,992   $ 2,992   $ 1,321
Petrobras Distribuidora [Member]          
DisclosureRelatedartyTransactionsLineItems [Line Items]          
Income expense   4,298   7,608  
Natural Gas Transportation Companies [Member]          
DisclosureRelatedartyTransactionsLineItems [Line Items]          
Income expense   $ (59)   $ (304)