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Schedule of recoverable taxes (Details) - BRL (R$)
R$ in Millions
Dec. 31, 2021
Dec. 31, 2020
IfrsStatementLineItems [Line Items]    
Recoverable taxes, current R$ 1,969 R$ 1,850
[custom:NoncurrentRecoverableTaxes-0] 1,997 3,442
[custom:RecoverableTaxes-0] 3,966 5,292
I C M S V A T [Member]    
IfrsStatementLineItems [Line Items]    
Recoverable taxes, current 113 97
[custom:NoncurrentRecoverableTaxes-0] 342 257
P I S And Paseptaxes [Member]    
IfrsStatementLineItems [Line Items]    
Recoverable taxes, current 329 311
[custom:NoncurrentRecoverableTaxes-0] 316 588
Cofins Tax [Member]    
IfrsStatementLineItems [Line Items]    
Recoverable taxes, current 1,508 1,426
[custom:NoncurrentRecoverableTaxes-0] 1,339 2,594
Other Tax Recoverable [Member]    
IfrsStatementLineItems [Line Items]    
Recoverable taxes, current 19 16
[custom:NoncurrentRecoverableTaxes-0] R$ 0 R$ 3