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Finance debt (Details 6)
$ in Millions
 6 Months Ended
Jun. 30, 2025
USD ($)
Foreign countries [member]  
IfrsStatementLineItems [Line Items]  
Available (Lines of Credit) $ 7,050
Balance 7,050
Country Of Brazil [Member]  
IfrsStatementLineItems [Line Items]  
Available (Lines of Credit) 1,434
Balance $ 1,434
Syndicate Of Banks [Member] | Foreign countries [member] | Petrobras Global Trading B V [Member]  
IfrsStatementLineItems [Line Items]  
Date 12/16/2021
Maturity 11/16/2026
Available (Lines of Credit) $ 5,000
Balance $ 5,000
Syndicate Of Banks Two [Member] | Foreign countries [member] | Petrobras Global Trading B V [Member]  
IfrsStatementLineItems [Line Items]  
Date 3/27/2019
Maturity 2/27/2026
Available (Lines of Credit) $ 2,050
Balance $ 2,050
Banco Do Brasil [Member] | Country Of Brazil [Member] | Petroleo Brasileiro Sa [Member]  
IfrsStatementLineItems [Line Items]  
Date 3/23/2018
Maturity 9/26/2030
Available (Lines of Credit) $ 641
Balance $ 641
Bradesco [Member] | Country Of Brazil [Member] | Petroleo Brasileiro Sa [Member]  
IfrsStatementLineItems [Line Items]  
Date 10/4/2018
Maturity 9/4/2029
Available (Lines of Credit) $ 733
Balance $ 733
Caixa Economica Federal [Member] | Country Of Brazil [Member] | Petroleo Brasileiro Sa [Member]  
IfrsStatementLineItems [Line Items]  
Date 11/23/2010
Available (Lines of Credit) $ 60
Balance $ 60