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Equity and Remuneration to Shareholders - Reserves - Schedule of Capital Reserves and Profit Reserves (Detail) - BRL (R$) R$ in Millions	Apr. 23, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Disclosure of reserves within equity [abstract]
Investment-related subsidies		R$ 1,857	R$ 1,857	R$ 1,857
Goodwill on issuance of shares		69	69	69
Shares in treasury		(1)	(1)	(1)
Capital reserves and shares in Treasury	R$ 324	1,925	1,925	1,925
Legal reserve		853	853	853
Statutory Reserve		57	57	57
Retained earnings reserve		3,341	2,813	2,906
Incentives tax reserve		58	57	50
Reserve for mandatory dividends not distributed		1,420	1,420	797
Profit reserves		R$ 5,729	R$ 5,200	R$ 4,663

X

- Definition

The amount received or receivable from the issuance of the entity's shares in excess of nominal value and amounts received from other transactions involving the entity's stock or stockholders.

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- Definition

A component of equity representing the capital reserves.

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A component of equity representing the entity's cumulative undistributed earnings or deficit.

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A component of equity representing reserves created based on legal requirements.

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An entity’s own equity instruments, held by the entity or other members of the consolidated group.

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Investment related subsidies.

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Legal reserve.

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Reserve for mandatory dividends not distributed.

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Retained earnings reserve.

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Tax incentives reserve.

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