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21. EQUITY (Details 1) - shares
Dec. 31, 2020
Dec. 31, 2019
EquityAbstractLineItems [Line Items]    
Quantity 812,473,246 812,473,246
Percent (%) 100.00% 100.00%
Treasury shares [member]    
EquityAbstractLineItems [Line Items]    
Quantity 4,766,084 713,446
Percent (%) 0.59% 0.09%
Fundacao Petrobras de Seguridade Social - Petros [Member]    
EquityAbstractLineItems [Line Items]    
Quantity [1] 92,716,266 92,716,266
Percent (%) [1] 11.41% 11.41%
Caixa de Previd. dos Func. Do Banco do Brasil [Member]    
EquityAbstractLineItems [Line Items]    
Quantity [1] 74,856,852 76,974,752
Percent (%) [1] 9.21% 9.47%
Board of Directors [Member]    
EquityAbstractLineItems [Line Items]    
Quantity 6,865,302 6,474,420
Percent (%) 0.84% 0.80%
Executives [Member]    
EquityAbstractLineItems [Line Items]    
Quantity 605,902 236,338
Percent (%) 0.07% 0.03%
Other Share Holders [Member]    
EquityAbstractLineItems [Line Items]    
Quantity 632,662,840 635,358,024
Percent (%) 77.88% 78.20%
[1] The pension funds are controlled by employees that participate in the respective entities.