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Schedule of marketable securities (Details) - BRL (R$)
R$ in Millions
Dec. 31, 2021
Dec. 31, 2020
IfrsStatementLineItems [Line Items]    
Current investments R$ 1,724 R$ 3,360
[custom:LongTermSecurities-0] 354 765
[custom:ShortTermAndLongTermSecurities-0] 2,078 4,125
Bank Certificate Of Deposit C D B [Member]    
IfrsStatementLineItems [Line Items]    
Current investments 101 545
Financial Notes Banks [Member]    
IfrsStatementLineItems [Line Items]    
Current investments 1,417 2,074
[custom:LongTermSecurities-0] 348 730
Treasury financial notes [member]    
IfrsStatementLineItems [Line Items]    
Current investments 178 731
Other Investment [Member]    
IfrsStatementLineItems [Line Items]    
Current investments 28 10
[custom:LongTermSecurities-0] 1 10
Debentures [Member]    
IfrsStatementLineItems [Line Items]    
[custom:LongTermSecurities-0] R$ 5 R$ 25