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Equity and Remuneration to Shareholders - Schedule of Dividends Proposed for Distribution to Shareholders Based on the Profit for the Business Year (Detail) - BRL (R$) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Disclosure of Dividends [Line Items] |  |  |  |
Percentage applied to the nominal value of the preferred shares | 6.00% |  |  |
Equity | R$ 14,330,000,000 | R$ 12,934,000,000 | R$ 12,988,000,000 | R$ 11,285,000,000
Net income for the year | 1,002,000,000 | 334,000,000 | 2,469,000,000 |
Dividend distribution [Member] |  |  |  |
Disclosure of Dividends [Line Items] |  |  |  |
Equity | 14,326,000,000 | 12,930,000,000 | 12,984,000,000 |
Net income for the year | R$ 1,001,000,000 | 334,000,000 | 2,469,000,000 |
Preference shares [member] |  |  |  |
Disclosure of Dividends [Line Items] |  |  |  |
Percentage applied to the nominal value of the preferred shares | 10.00% |  |  |
Percentage applied to the portion of Equity represented by the preferred shares | 3.00% |  |  |
Preference shares [member] | Dividend distribution [Member] |  |  |  |
Disclosure of Dividends [Line Items] |  |  |  |
Nominal value of the preferred shares | R$ 4,191,000,000 | 4,190,000,000 | 4,190,000,000 |
Nominal value of the preferred shares to be capitalized | 665,000,000 |  |  |
Preferred shares | R$ 4,856,000,000 | R$ 4,190,000,000 | R$ 4,190,000,000 |
Percentage applied to the nominal value of the preferred shares | 10.00% | 10.00% | 10.00% |
Amount of the dividends by the First payment criterion | R$ 486,000,000 | R$ 419,000,000 | R$ 419,000,000 |
Equity | R$ 9,538,000,000 | R$ 8,609,000,000 | R$ 8,645,000,000 |
Preferred shares as a percentage of Equity (net of shares held in Treasury) | 66.58% | 66.58% | 66.58% |
Percentage applied to the portion of Equity represented by the preferred shares | 3.00% | 3.00% | 3.00% |
Amount of the dividends by the Second payment criterion | R$ 286,000,000 | R$ 258,000,000 | R$ 259,000,000 |
Minimum Dividends required by the Bylaws for the preferred shares | 486,000,000 | 419,000,000 | 419,000,000 |
Mandatory dividends - 50% of Net income | R$ 500,000,000 | R$ 167,000,000 | R$ 1,235,000,000 |

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