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Taxes, Amounts to be Restituted to Customers, Income Tax and Social Contribution - Summary of Income Tax and Social Contribution Tax (Detail) - BRL (R$)
R$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Disclosure of taxes, income tax and social contribution tax [abstract]    
Income tax R$ 83 R$ 88
Social contribution tax 29 27
Total income and social contribution tax R$ 112 R$ 115