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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, 2017
Dec. 31, 2016
Disclosure Of Future Taxable Profits Enable Deferred Tax Assets [Line Items]    
Deferred tax assets future taxable profits R$ 3,052 R$ 2,953
2018 [member]    
Disclosure Of Future Taxable Profits Enable Deferred Tax Assets [Line Items]    
Deferred tax assets future taxable profits 421  
2019 [member]    
Disclosure Of Future Taxable Profits Enable Deferred Tax Assets [Line Items]    
Deferred tax assets future taxable profits 477  
2020 [member]    
Disclosure Of Future Taxable Profits Enable Deferred Tax Assets [Line Items]    
Deferred tax assets future taxable profits 476  
2021 [member]    
Disclosure Of Future Taxable Profits Enable Deferred Tax Assets [Line Items]    
Deferred tax assets future taxable profits 452  
2022 [member]    
Disclosure Of Future Taxable Profits Enable Deferred Tax Assets [Line Items]    
Deferred tax assets future taxable profits 465  
2022-2024 [member]    
Disclosure Of Future Taxable Profits Enable Deferred Tax Assets [Line Items]    
Deferred tax assets future taxable profits 493  
2025-2026 [Member]    
Disclosure Of Future Taxable Profits Enable Deferred Tax Assets [Line Items]    
Deferred tax assets future taxable profits R$ 268