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28. EQUITY AND REMUNERATION TO SHAREHOLDERS (Details 3) - BRL (R$) R$ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
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	394	69
Shares in treasury	(1)	(1)	(1)
Capital reserves and shares in Treasury	2,250	2,250	1,925
Legal reserve	853	853	853
Statutory reserve	57	57	57
Retained earnings reserve	5,500	3,965	3,341
Unrealized profit reserve	835
Incentive tax reserve	85	67	58
Reserve for mandatory dividends not distributed		1,420	1,420
Profit reserves	R$ 8,750	R$ 6,362	R$ 5,729

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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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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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A component of equity representing the capital reserves.

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A component of equity resulting from discretionary participation features. Discretionary participation features are contractual rights to receive, as a supplement to guaranteed benefits, additional benefits: (a) that are likely to be a significant portion of the total contractual benefits; (b) whose amount or timing is contractually at the discretion of the issuer; and (c) that are contractually based on: (i) the performance of a specified pool of contracts or a specified type of contract; (ii) realised and/or unrealised investment returns on a specified pool of assets held by the issuer; or (iii) the profit or loss of the company, fund or other entity that issues the contract.

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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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