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Equity and Remuneration to Shareholders - Summary of Calculation of Basic Earnings per Share (Detail) - BRL (R$) R$ / shares in Units, 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$ 1,379	R$ 1,002	R$ 334
Net income for the year from continuing operations attributed to equity holders of the parent	1,379	1,002	334
Preferred shares [member]
Earnings per share [line items]
Minimum mandatory dividend from net income for the year	577	486	204
Net income for the year not distributed	554	333	87
Total earnings	R$ 1,131	R$ 819	R$ 291
Basic earnings per share	R$ 1.17	R$ 0.84	R$ 0.35
Minimum mandatory dividend from net income for the year from continuing operations	R$ 527	R$ 486	R$ 204
Net income for the year from continuing operations not distributed	390	333	87
Total earnings from continuing operations	R$ 917	R$ 819	R$ 291
Basic earnings from continuing operations per share	R$ 0.95	R$ 0.84	R$ 0.35
Common shares [member]
Earnings per share [line items]
Minimum mandatory dividend from net income for the year	R$ 290	R$ 15
Net income for the year not distributed	279	167	R$ 44
Total earnings	R$ 569	R$ 182	R$ 44
Basic earnings per share	R$ 1.17	R$ 0.37	R$ 0.10
Minimum mandatory dividend from net income for the year from continuing operations	R$ 290	R$ 15
Net income for the year from continuing operations not distributed	171	167	R$ 44
Total earnings from continuing operations	R$ 461	R$ 182	R$ 44
Basic earnings from continuing operations per share	R$ 0.95	R$ 0.37	R$ 0.10

X

- Definition

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).

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