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Equity and Remuneration to Shareholders - Summary of Detailed Information Regarding Calculation of Retained Earnings Reserve (Detail) - BRL (R$)
R$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Disclosure of reserves and retained earnings within equity [line items]      
Net income for the year R$ 1,700 R$ 1,001 R$ 334
Expired dividends 42    
Retained earnings [member]      
Disclosure of reserves and retained earnings within equity [line items]      
Net income for the year 1,700 1,001 334
Expired dividends 42    
Incentives tax reserve (9) (1) (7)
Deemed cost realization 42 28 37
Adjustment for initial adoption of IFRS 9 and IFRS 15. (157)    
Dividends proposed (867) (500) (203)
Retained earnings reserve R$ 751 R$ 528 R$ 161