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Income and Social Contribution Taxes - Summary of Estimated Balance of Deferred Tax Asset (Detail) - BRL (R$)
R$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Disclosure Of Future Taxable Profits Enable Deferred Tax Assets [line items]    
Deferred tax assets future taxable profits R$ 3,471 R$ 3,052
2019 [member]    
Disclosure Of Future Taxable Profits Enable Deferred Tax Assets [line items]    
Deferred tax assets future taxable profits 567  
2020 [member]    
Disclosure Of Future Taxable Profits Enable Deferred Tax Assets [line items]    
Deferred tax assets future taxable profits 566  
2021 [member]    
Disclosure Of Future Taxable Profits Enable Deferred Tax Assets [line items]    
Deferred tax assets future taxable profits 542  
2022 [member]    
Disclosure Of Future Taxable Profits Enable Deferred Tax Assets [line items]    
Deferred tax assets future taxable profits 547  
2023 [member]    
Disclosure Of Future Taxable Profits Enable Deferred Tax Assets [line items]    
Deferred tax assets future taxable profits 492  
2024-2026 [member]    
Disclosure Of Future Taxable Profits Enable Deferred Tax Assets [line items]    
Deferred tax assets future taxable profits 458  
2027-2028 [member]    
Disclosure Of Future Taxable Profits Enable Deferred Tax Assets [line items]    
Deferred tax assets future taxable profits R$ 299