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Equity and Remuneration to Shareholders - Summary of Calculation of Diluted Earnings per Share (Detail) - BRL (R$) R$ / shares in Units, shares in Millions, R$ in Millions | 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 | R$ 334 | R$ 2,469
Preferred shares [member] |  |  |
Earnings per share [line items] |  |  |
Total basic earnings for the preferred shares | 819 | 291 | 1,643
Diluted earnings for the common shares (D) | R$ 819 | R$ 264 | R$ 1,643
Diluted earnings per common share ( D / No. of common shares ) | R$ 0.84 | R$ 0.32 | R$ 1.96
Common shares [member] |  |  |
Earnings per share [line items] |  |  |
Total basic earnings for the preferred shares | R$ 182 | R$ 44 | R$ 826
Diluted earnings for the common shares (D) | R$ 182 | R$ 30 | R$ 826
Diluted earnings per common share ( D / No. of common shares ) | R$ 0.37 | R$ 0.07 | R$ 1.96
RME/Lepsa Option [Member] | Preferred shares [member] |  |  |
Earnings per share [line items] |  |  |
Dilutive effect |  | (22) |
RME/Lepsa Option [Member] | Common shares [member] |  |  |
Earnings per share [line items] |  |  |
Dilutive effect |  | (11) |
Ativas Option [Member] | Preferred shares [member] |  |  |
Earnings per share [line items] |  |  |
Dilutive effect |  | (5) |
Ativas Option [Member] | Common shares [member] |  |  |
Earnings per share [line items] |  |  |
Dilutive effect |  | (2) |

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