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Equity and Remuneration to Shareholders - Summary of Calculation of Basic Earnings per Share (Detail) - BRL (R$) | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Earnings per share [line items] |  |  |
Net income for the year | R$ 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

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