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Taxes, Amounts to be Restituted to Customers, Income Tax and Social Contribution - Summary of Taxes and Amounts to be Restituted to Customers (Detail) - BRL (R$)
R$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Current    
Total current liabilities R$ 410 R$ 705
Non-current    
Total non-current liabilities 29 28
Total liabilities 439 733
Non-current    
Total asset 1,124 1,087
ICMS [member]    
Current    
Total current liabilities 168 497
COFINS [member]    
Current    
Total current liabilities 146 126
Non-current    
Total non-current liabilities 25 24
PASEP [member]    
Current    
Total current liabilities 32 27
Non-current    
Total non-current liabilities 4 4
INSS [member]    
Current    
Total current liabilities 23 20
Other Tax Authority [member]    
Current    
Total current liabilities 41 35
Pasep and COFINS [member]    
Non-current    
Total asset R$ 1,124 R$ 1,087