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Investments (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Jan. 12, 2022
Dec. 31, 2019
IfrsStatementLineItems [Line Items]          
Shareholders'equity (deficit) $ 69,836 $ 69,812 $ 59,876   $ 74,215
Net income for the year $ 36,755 $ 19,986 $ 948    
Exploration And Production Refining Transportation And Marketing Gas And Power And Distribution Segment [Member] | Petrobras International Braspetro Pibbv [Member] | Netherlands [Member]          
IfrsStatementLineItems [Line Items]          
Name of subsidiary Several        
Proportion of ownership interest in subsidiary 100.00%        
Proportion of voting rights held in subsidiary 100.00%        
Shareholders'equity (deficit) $ 52,728        
Net income for the year $ 3,787        
Country Netherlands        
Refining Transportation And Marketing Segment [Member] | Petrobras Transporte S A Transpetro [Member] | Countries Of Domicile [Member]          
IfrsStatementLineItems [Line Items]          
Name of subsidiary RT&M        
Proportion of ownership interest in subsidiary 100.00%        
Proportion of voting rights held in subsidiary 100.00%        
Shareholders'equity (deficit) $ 932        
Net income for the year $ 90        
Country Brazil        
Refining Transportation And Marketing Segment [Member] | Fabrica Carioca De Catalizadores S A F C C [Member] | Countries Of Domicile [Member]          
IfrsStatementLineItems [Line Items]          
Name of subsidiary RT&M        
Proportion of ownership interest in subsidiary 50.00%        
Proportion of voting rights held in subsidiary 50.00%        
Shareholders'equity (deficit) $ 50        
Net income for the year $ 17        
Country Brazil        
Refining Transportation And Marketing Segment [Member] | Logum Logistica S A [Member] | Countries Of Domicile [Member]          
IfrsStatementLineItems [Line Items]          
Name of subsidiary RT&M        
Proportion of ownership interest in subsidiary 30.00%        
Proportion of voting rights held in subsidiary 30.00%        
Shareholders'equity (deficit) $ 192        
Net income for the year $ (33)        
Country Brazil        
Refining Transportation And Marketing Segment [Member] | Petrocoque S A Industria E Comercio [Member] | Countries Of Domicile [Member]          
IfrsStatementLineItems [Line Items]          
Name of subsidiary RT&M        
Proportion of ownership interest in subsidiary 50.00%        
Proportion of voting rights held in subsidiary 50.00%        
Shareholders'equity (deficit) $ 16        
Net income for the year $ 80        
Country Brazil        
Refining Transportation And Marketing Segment [Member] | Refinaria De Petroleo Riograndense S A [Member] | Countries Of Domicile [Member]          
IfrsStatementLineItems [Line Items]          
Name of subsidiary RT&M        
Proportion of ownership interest in subsidiary 33.20%        
Proportion of voting rights held in subsidiary 33.33%        
Shareholders'equity (deficit) $ 19        
Net income for the year $ 15        
Country Brazil        
Refining Transportation And Marketing Segment [Member] | Metanol Do Nordeste S A Metanor [Member] | Countries Of Domicile [Member]          
IfrsStatementLineItems [Line Items]          
Name of subsidiary RT&M        
Proportion of ownership interest in subsidiary 34.54%        
Proportion of voting rights held in subsidiary 50.00%        
Shareholders'equity (deficit) $ 19        
Net income for the year $ 5        
Country Brazil        
Refining Transportation And Marketing Segment [Member] | Companhia De Coque Calcinado De Petroleo S A Coquepar [Member] | Countries Of Domicile [Member]          
IfrsStatementLineItems [Line Items]          
Name of subsidiary RT&M        
Proportion of ownership interest in subsidiary 45.00%        
Proportion of voting rights held in subsidiary 45.00%        
Country Brazil        
Refining Transportation And Marketing Segment [Member] | Braskem S A [Member] | Countries Of Domicile [Member]          
IfrsStatementLineItems [Line Items]          
Name of subsidiary RT&M        
Proportion of ownership interest in subsidiary 36.15%        
Proportion of voting rights held in subsidiary 47.03%        
Shareholders'equity (deficit) $ 1,309        
Net income for the year $ 206        
Country Brazil        
Refining Transportation And Marketing Segment [Member] | Nitroclor Ltda [Member] | Countries Of Domicile [Member]          
IfrsStatementLineItems [Line Items]          
Name of subsidiary RT&M        
Proportion of ownership interest in subsidiary 38.80%        
Proportion of voting rights held in subsidiary 38.80%        
Country Brazil        
Exploration And Production Segment [Member] | Petrobras Logistica De Exploracao E Producao S A P B L O G [Member] | Countries Of Domicile [Member]          
IfrsStatementLineItems [Line Items]          
Name of subsidiary E&P        
Proportion of ownership interest in subsidiary 100.00%        
Proportion of voting rights held in subsidiary 100.00%        
Shareholders'equity (deficit)       $ 87  
Net income for the year $ 225        
Country Brazil        
Exploration And Production Segment [Member] | Fundo De Investimento Imobiliario R B Logistica F I I [Member] | Countries Of Domicile [Member]          
IfrsStatementLineItems [Line Items]          
Name of subsidiary E&P        
Proportion of ownership interest in subsidiary 99.15%        
Proportion of voting rights held in subsidiary 99.15%        
Shareholders'equity (deficit) $ 16        
Net income for the year $ 8        
Country Brazil        
Biofuels Segment [Member] | Petrobras Biocombustivel S A [Member] | Countries Of Domicile [Member]          
IfrsStatementLineItems [Line Items]          
Name of subsidiary Corporate, others        
Proportion of ownership interest in subsidiary 100.00%        
Proportion of voting rights held in subsidiary 100.00%        
Shareholders'equity (deficit) $ 193        
Net income for the year $ (38)        
Country Brazil        
Gas And Power Segment [Member] | Araucaria Nitrogenados S A [Member] | Countries Of Domicile [Member]          
IfrsStatementLineItems [Line Items]          
Name of subsidiary Gas & Power        
Proportion of ownership interest in subsidiary 100.00%        
Proportion of voting rights held in subsidiary 100.00%        
Shareholders'equity (deficit) $ 31        
Net income for the year $ 10        
Country Brazil        
Gas And Power Segment [Member] | Termomacae Ltda [Member] | Countries Of Domicile [Member]          
IfrsStatementLineItems [Line Items]          
Name of subsidiary Gas & Power        
Proportion of ownership interest in subsidiary 100.00%        
Proportion of voting rights held in subsidiary 100.00%        
Shareholders'equity (deficit) $ 61        
Net income for the year $ 14        
Country Brazil        
Gas And Power Segment [Member] | Termobahia S A [Member] | Countries Of Domicile [Member]          
IfrsStatementLineItems [Line Items]          
Name of subsidiary Gas & Power        
Proportion of ownership interest in subsidiary 98.85%        
Proportion of voting rights held in subsidiary 98.85%        
Shareholders'equity (deficit) $ 67        
Net income for the year $ 11        
Country Brazil        
Gas And Power Segment [Member] | Baixada Santista Energia S A [Member] | Countries Of Domicile [Member]          
IfrsStatementLineItems [Line Items]          
Name of subsidiary Gas & Power        
Proportion of ownership interest in subsidiary 100.00%        
Proportion of voting rights held in subsidiary 100.00%        
Shareholders'equity (deficit) $ 58        
Net income for the year $ 4        
Country Brazil        
Gas And Power Segment [Member] | Transportadora Brasileira Gasoduto Brasil Bolivia [Member] | Countries Of Domicile [Member]          
IfrsStatementLineItems [Line Items]          
Name of subsidiary Gas & Power        
Proportion of ownership interest in subsidiary 51.00%        
Proportion of voting rights held in subsidiary 51.00%        
Shareholders'equity (deficit) $ 119        
Net income for the year $ 181        
Country Brazil        
Gas And Power Segment [Member] | Ibiritermo S A [Member] | Countries Of Domicile [Member]          
IfrsStatementLineItems [Line Items]          
Name of subsidiary Gas & Power        
Proportion of ownership interest in subsidiary 100.00%        
Proportion of voting rights held in subsidiary 100.00%        
Shareholders'equity (deficit) $ 2        
Net income for the year $ 5        
Country Brazil        
Gas And Power Segment [Member] | Brasympe Energia S A [Member] | Countries Of Domicile [Member]          
IfrsStatementLineItems [Line Items]          
Name of subsidiary Gas & Power        
Proportion of ownership interest in subsidiary 20.00%        
Proportion of voting rights held in subsidiary 20.00%        
Shareholders'equity (deficit) $ 14        
Net income for the year $ 1        
Country Brazil        
Gas And Power Segment [Member] | Brentech Energia S A [Member] | Countries Of Domicile [Member]          
IfrsStatementLineItems [Line Items]          
Name of subsidiary Gas & Power        
Proportion of ownership interest in subsidiary 30.00%        
Proportion of voting rights held in subsidiary 30.00%        
Shareholders'equity (deficit) $ 16        
Net income for the year $ 28        
Country Brazil        
Gas And Power Segment [Member] | U E G Araucaria Ltda [Member] | Countries Of Domicile [Member]          
IfrsStatementLineItems [Line Items]          
Name of subsidiary Gas & Power        
Proportion of ownership interest in subsidiary 18.80%        
Proportion of voting rights held in subsidiary 18.80%        
Shareholders'equity (deficit) $ 82        
Net income for the year $ (26)        
Country Brazil        
Gas And Power Segment [Member] | Energetica S U A P E I I [Member] | Countries Of Domicile [Member]          
IfrsStatementLineItems [Line Items]          
Name of subsidiary Gas & Power        
Proportion of ownership interest in subsidiary 20.00%        
Proportion of voting rights held in subsidiary 20.00%        
Shareholders'equity (deficit) $ 88        
Net income for the year $ 31        
Country Brazil        
Gas And Power Segment [Member] | Bioenergetica Britaruma S A [Member] | Countries Of Domicile [Member]          
IfrsStatementLineItems [Line Items]          
Name of subsidiary Gas & Power        
Proportion of ownership interest in subsidiary 30.00%        
Proportion of voting rights held in subsidiary 30.00%        
Country Brazil        
Corporate Segment [Member] | Braspetro Oil Services Company Brasoil [Member] | Cayman Islands [Member]          
IfrsStatementLineItems [Line Items]          
Name of subsidiary Corporate, others        
Proportion of ownership interest in subsidiary 100.00%        
Proportion of voting rights held in subsidiary 100.00%        
Shareholders'equity (deficit) $ 118        
Net income for the year $ 7        
Country Cayman Islands        
Corporate Segment [Member] | Procurement Negocios Eletronicos S A [Member] | Countries Of Domicile [Member]          
IfrsStatementLineItems [Line Items]          
Name of subsidiary Corporate, others        
Proportion of ownership interest in subsidiary 72.00%        
Proportion of voting rights held in subsidiary 49.00%        
Shareholders'equity (deficit) $ 7        
Net income for the year $ 2        
Country Brazil        
Corporate Segment [Member] | Petrobras Comercializadora De Energia Ltda P B E N [Member] | Countries Of Domicile [Member]          
IfrsStatementLineItems [Line Items]          
Name of subsidiary Corporate, others        
Proportion of ownership interest in subsidiary 100.00%        
Proportion of voting rights held in subsidiary 100.00%        
Shareholders'equity (deficit) $ 11        
Country Brazil        
Corporate Segment [Member] | Associacao Petrobras De Saude [Member] | Countries Of Domicile [Member]          
IfrsStatementLineItems [Line Items]          
Name of subsidiary Corporate, others        
Proportion of ownership interest in subsidiary 93.47%        
Proportion of voting rights held in subsidiary 93.47%        
Shareholders'equity (deficit) $ 116        
Net income for the year $ 21        
Country Brazil        
R Tand M [Member] | Refinariade Mataripe S A [Member] | Countries Of Domicile [Member]          
IfrsStatementLineItems [Line Items]          
Name of subsidiary RT&M        
Proportion of ownership interest in subsidiary 100.00%        
Proportion of voting rights held in subsidiary 100.00%        
Country Brazil        
R Tand M [Member] | Refinaria De Mucuripe S A [Member] | Countries Of Domicile [Member]          
IfrsStatementLineItems [Line Items]          
Name of subsidiary RT&M        
Proportion of ownership interest in subsidiary 100.00%        
Proportion of voting rights held in subsidiary 100.00%        
Country Brazil        
Gas And Power [Member] | Transportadora Sulbrasileirade Gas T S B [Member] | Countries Of Domicile [Member]          
IfrsStatementLineItems [Line Items]          
Name of subsidiary Gas & Power        
Proportion of ownership interest in subsidiary 25.00%        
Proportion of voting rights held in subsidiary 25.00%        
Shareholders'equity (deficit) $ 3        
Net income for the year $ 2        
Country Brazil