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Equity and Remuneration to Shareholders - Summary of Equity Valuation Adjustments (Detail) - BRL (R$)
R$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Miscellaneous equity [abstract]      
Deemed cost of PP&E R$ 639 R$ 685 R$ 720
Accumulated Other Comprehensive Income Variation in fair value of financial asset available for sale in jointly-controlled entity   37 18
Cumulative translation adjustments     63
Adjustments to actuarial liabilities - Employee benefits (1,476) (1,211) (699)
Equity valuation adjustments R$ (837) R$ (489) R$ 102