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Financial Instruments and Risk Management - Summary of Net Liabilities in Relation to its Equity (Detail) - BRL (R$) R$ in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Disclosure of financial liabilities [line items] |  |  |  |
Total liabilities | R$ (27,910) | R$ (29,102) |  |
(-) Cash and cash equivalents | 1,030 | 995 |  |
Net assets (liabilities) exposed | (46) | (407) | R$ 1,350 | R$ 1,107
Total equity | 14,330 | 12,934 | R$ 12,988 | R$ 11,285
Capital management [member] |  |  |  |
Disclosure of financial liabilities [line items] |  |  |  |
Total liabilities | 27,910 | 29,102 |  |
(-) Cash and cash equivalents | (1,030) | (995) |  |
(-) Restricted cash | (106) | (367) |  |
Net assets (liabilities) exposed | 26,774 | 27,740 |  |
Total equity | R$ 14,330 | R$ 12,934 |  |
Net liabilities / equity | 1.87% | 2.14% |  |

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