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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
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Earnings per share [line items]
Net income for the year attributed to equity holders of the parent	R$ 1,700	R$ 1,001	R$ 334
Net income for the year from continuing operations attributed to equity holders of the parent	1,378	1,001	334
Preferred shares [member]
Earnings per share [line items]
Total basic earnings	1,131	819	291
Total diluted earnings	R$ 1,131	R$ 819	R$ 264
Diluted earnings per common share (D / number of common shares)	R$ 1.17	R$ 0.84	R$ 0.32
Total basic earnings from continuing operations	R$ 917	R$ 819	R$ 291
Total diluted earnings from continuing operations	R$ 917	R$ 819	R$ 264
Diluted earnings from continuing operations per common share (D.1 / number of common shares)	R$ 0.95	R$ 0.84	R$ 0.32
Common shares [member]
Earnings per share [line items]
Total basic earnings	R$ 569	R$ 182	R$ 44
Total diluted earnings	R$ 569	R$ 182	R$ 30
Diluted earnings per common share (D / number of common shares)	R$ 1.17	R$ 0.37	R$ 0.07
Total basic earnings from continuing operations	R$ 461	R$ 182	R$ 44
Total diluted earnings from continuing operations	R$ 461	R$ 182	R$ 30
Diluted earnings from continuing operations per common share (D.1 / number of common shares)	R$ 0.95	R$ 0.37	R$ 0.07
RME/Lepsa Option [Member] | Preferred shares [member]
Earnings per share [line items]
Dilution effect related to the Option			(22)
Dilution effect related to the Option			(22)
RME/Lepsa Option [Member] | Common shares [member]
Earnings per share [line items]
Dilution effect related to the Option			(11)
Dilution effect related to the Option			(11)
Ativas Option [Member] | Preferred shares [member]
Earnings per share [line items]
Dilution effect related to the Option			(5)
Dilution effect related to the Option			(5)
Ativas Option [Member] | Common shares [member]
Earnings per share [line items]
Dilution effect related to the Option			(3)
Dilution effect related to the Option			(3)

X

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The amount of profit (loss) attributable to ordinary equity holders of the parent entity (the numerator), divided by the weighted average number of ordinary shares outstanding during the period (the denominator), both adjusted for the effects of all dilutive potential ordinary shares. [Refer: Ordinary shares [member]; Weighted average [member]]

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