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Schedule of derivative instruments contracted (Details) - BRL (R$)
R$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
IfrsStatementLineItems [Line Items]    
Unrealized gain/loss Carrying amount R$ 1,451 R$ 2,360
Unrealized gain/loss fair value 1,213 2,949
TOTAL CURRENT   523
Non-current asset 1,219 2,426
[custom:NoncurrentLiabilities3-0] R$ (6)  
Over The Counters [Member]    
IfrsStatementLineItems [Line Items]    
Assets US$ exchange variation + Rate (9.25% p.y.) (1)  
Liability R$151.99% of CDI  
Maturity period Interest: Half-yearly Principal: Dec. 2024  
Trade market Over the counter  
Unrealized gain/loss Carrying amount R$ 873 1,772
Unrealized gain/loss fair value R$ 706 2,110
Over The Counters [Member] | United States of America, Dollars    
IfrsStatementLineItems [Line Items]    
Notional amount   500
Over The Counters One [Member]    
IfrsStatementLineItems [Line Items]    
Assets US$ exchange variation + Rate (9.25% p.y.) (1)  
Liability R$125.52% of CDI  
Maturity period Interest: Half-yearly Principal: Dec. 2024  
Trade market Over the counter  
Unrealized gain/loss Carrying amount R$ 578 588
Unrealized gain/loss fair value 507 R$ 839
Over The Counters One [Member] | United States of America, Dollars    
IfrsStatementLineItems [Line Items]    
Notional amount R$ 500