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Disposal of assets and other transactions (Details 1)
$ in Millions
 12 Months Ended
Dec. 31, 2022
USD ($)
Transaction Pending One [Member]  
IfrsStatementLineItems [Line Items]  
Transaction Sale of the Company's entire interest (100%) in a set of 22 production onshore and shallow water field concessions, together with its associated infrastructure, located in the Potiguar Basin, in the state of Rio Grande do Norte, jointly called the Potiguar group of fields.
Acquirer 3R Potiguar SA, subsidiary of 3R Petroleum Óleo e Gás SA
Signature date January 2022
Transaction amount $ 1,385
Transaction Pending Two [Member]  
IfrsStatementLineItems [Line Items]  
Transaction Sale of the Company's entire interest in a set of four onshore production fields, with integrated facilities, located in the state of Espírito Santo, jointly called Norte Capixaba group of fields.
Acquirer Seacrest Petróleo SPE Norte Capixaba Ltda., a wholly owned subsidiary of Seacrest Exploração e Produção de Petróleo Ltda.
Signature date February 2022
Transaction amount $ 478
Transaction Pending Three [Member]  
IfrsStatementLineItems [Line Items]  
Transaction Sale of the Company's entire interest in the Albacora Leste concession, located predominantly in deep waters in the Campos Basin.
Acquirer Petro Rio Jaguar Petróleo Ltda. (PetroRio), subsidiary of Petro Rio S.A.
Signature date April 2022
Transaction amount $ 1,951
Transaction Pending Four [Member]  
IfrsStatementLineItems [Line Items]  
Transaction Sale of the Lubrificantes e Derivados de Petróleo do Nordeste (LUBNOR) refinery and its associated logistics assets, located in the state of Ceará.
Acquirer Grepar Participações Ltda.
Signature date May 2022
Transaction amount $ 34
Transaction Pending Five [Member]  
IfrsStatementLineItems [Line Items]  
Transaction maritime concessions called Golfinho and Camarupim groups of fields, in deep waters of the post-salt layer, located in the Espírito Santo Basin.
Acquirer BW Energy Maromba do Brasil Ltda (BWE)
Signature date June 2022
Transaction amount $ 15