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Equity and Remuneration to Shareholders - Summary of Calculation of Basic Earnings per Share (Detail) - BRL (R$)
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Earnings per share [line items]      
Net income for the year R$ 1,002,000,000 R$ 334,000,000 R$ 2,469,000,000
Preferred shares [member]      
Earnings per share [line items]      
Minimum mandatory dividend for preferred shares from income for the period (item c) 486,000,000 204,000,000 422,000,000
Income not distributed arising from the net income for the period - common shares 333,000,000 87,000,000 1,221,000,000
Total earnings for the common shares (B) R$ 819,000,000 R$ 291,000,000 R$ 1,643,000,000
Basic earnings per common share ( B / number of common shares ) R$ 0.84 R$ 0.35 R$ 1.96
Common shares [member]      
Earnings per share [line items]      
Minimum mandatory dividend for preferred shares from income for the period (item c) R$ 15,000,000   R$ 212,000,000
Income not distributed arising from the net income for the period - common shares 167,000,000 R$ 44,000,000 614,000,000
Total earnings for the common shares (B) R$ 182,000,000 R$ 44,000,000 R$ 826,000,000
Basic earnings per common share ( B / number of common shares ) R$ 0.37 R$ 0.10 R$ 1.96