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Schedule of derivative instruments contracted Realized gain (Details) - BRL (R$)
R$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
IfrsStatementLineItems [Line Items]    
[custom:RealizedGainLossAccordingToContract1] R$ 1,198 R$ 495
Over The Counters [Member]    
IfrsStatementLineItems [Line Items]    
[custom:DerivativeInstrumentsAsset1] US$ exchange variation + Rate (9.25% p.y.)  
[custom:DerivativeInstrumentsLiabilities1] Local currency + R$ 151.99% of CDI  
[custom:FinancialInstrumentsMaturityPeriod1] Interest: Half-yearly Principal: Dec. 2024  
[custom:TradeMarket1] Over the counter  
[custom:RealizedGainLossAccordingToContract] R$ 1,019 329
Over The Counters [Member] | United States of America, Dollars    
IfrsStatementLineItems [Line Items]    
[custom:DerivativesNotionalAmount1]   1,000
Over The Counters One [Member]    
IfrsStatementLineItems [Line Items]    
[custom:DerivativeInstrumentsAsset1] US$ exchange variation + Rate (9.25% p.y.)  
[custom:DerivativeInstrumentsLiabilities1] Local currency + R$125.52% of CDI  
[custom:FinancialInstrumentsMaturityPeriod1] Interest: Half-yearly Principal: Dec. 2024  
[custom:TradeMarket1] Over the counter  
[custom:RealizedGainLossAccordingToContract1] R$ 155 R$ 166
Over The Counters One [Member] | United States of America, Dollars    
IfrsStatementLineItems [Line Items]    
[custom:DerivativesNotionalAmount1] R$ 500  
Over The Counters Two [Member]    
IfrsStatementLineItems [Line Items]    
[custom:DerivativeInstrumentsAsset1] US$ exchange variation higher R$5.0984  
[custom:DerivativeInstrumentsLiabilities1] US$ exchange variation lower R$5.0954  
[custom:FinancialInstrumentsMaturityPeriod1] August 03, 2021  
[custom:TradeMarket1] Over the counter  
[custom:RealizedGainLossAccordingToContract1] R$ 24  
Over The Counters Two [Member] | United States of America, Dollars    
IfrsStatementLineItems [Line Items]    
[custom:DerivativesNotionalAmount1] R$ 600