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Schedule of estimated balance of deferred tax asset (Details) - BRL (R$)
R$ in Millions
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
IfrsStatementLineItems [Line Items]      
Deferred tax assets future taxable profits R$ 4,255 R$ 4,323 R$ 4,028
Not later than one year [member]      
IfrsStatementLineItems [Line Items]      
Deferred tax assets future taxable profits 717    
Later Than One Years And Not Later Than Two Years [Member]      
IfrsStatementLineItems [Line Items]      
Deferred tax assets future taxable profits 583    
Later than two years and not later than three years [member]      
IfrsStatementLineItems [Line Items]      
Deferred tax assets future taxable profits 662    
Later than three years and not later than four years [member]      
IfrsStatementLineItems [Line Items]      
Deferred tax assets future taxable profits 507    
Later than four years and not later than five years [member]      
IfrsStatementLineItems [Line Items]      
Deferred tax assets future taxable profits 481    
Later Than Five Years And Not Later Than Eight Years [Member]      
IfrsStatementLineItems [Line Items]      
Deferred tax assets future taxable profits 845    
Later Than Eight Years And Not Later Than Ten Years [Member]      
IfrsStatementLineItems [Line Items]      
Deferred tax assets future taxable profits R$ 460