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Recoverable Taxes - Summary of Recoverable Taxes (Detail) - BRL (R$)
R$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Disclosure of Recoverable Taxes [Line Items]    
Recoverable taxes, current R$ 174 R$ 236
Recoverable taxes, non-current 231 178
Recoverable taxes 405 414
ICMS (VAT) [member]    
Disclosure of Recoverable Taxes [Line Items]    
Recoverable taxes, current 71 155
Recoverable taxes, non-current 225 171
PIS and Pasep taxes [member]    
Disclosure of Recoverable Taxes [Line Items]    
Recoverable taxes, current 12 12
Recoverable taxes, non-current 1 1
Cofins [member]    
Disclosure of Recoverable Taxes [Line Items]    
Recoverable taxes, current 56 58
Recoverable taxes, non-current 3 5
Other [member]    
Disclosure of Recoverable Taxes [Line Items]    
Recoverable taxes, current 35 11
Recoverable taxes, non-current R$ 2 R$ 1