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Equity and Remuneration to Shareholders - Reserves - Schedule of Capital Reserves and Profit Reserves (Detail) - BRL (R$) R$ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Disclosure of reserves within equity [abstract]
Investment-related donations and subsidies	R$ 1,857	R$ 1,857	R$ 1,857
Goodwill on issuance of shares	394	69	69
Shares in treasury	(1)	(1)	(1)
Capital reserves and shares in Treasury	2,250	1,925	1,925
Legal reserve	853	853	853
Statutory reserve	57	57	57
Retained earnings reserve	3,965	3,341	2,813
Incentive tax reserve	67	58	57
Reserve for mandatory dividends not distributed	1,420	1,420	1,420
Profit reserves	R$ 6,362	R$ 5,729	R$ 5,200

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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- Definition

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

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- Definition

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

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- Definition

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

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- Definition

Investment related subsidies.

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- Definition

Legal reserve.

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- Definition

Reserve for mandatory dividends not distributed.

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- Definition

Retained earnings reserve.

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- Definition

Tax incentives reserve.

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No definition available.

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