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Income and Social Contribution Taxes - Summary of Income and Social Contribution Taxes recoverable (Detail) - BRL (R$)
R$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Disclosure of income and social contribution taxes [abstract]    
Income tax R$ 253 R$ 231
Social contribution tax 140 130
Income and social contribution tax credits 393 361
Income and social contribution tax credits current 387 340
Income and social contribution tax credits noncurrent 6 21
Income tax 83 88
Social contribution tax 29 27
Total R$ 112 R$ 115