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16. CONCESSION FINANCIAL AND SECTOR ASSETS AND LIABILITIES (Details) - BRL (R$) R$ in Millions	Dec. 31, 2019	Dec. 31, 2018
Financial assets of the concession
Current assets	R$ 1,080	R$ 1,071
Non-current assets	4,851	4,927
Assets Related To Infrastructure [Member]
Financial assets of the concession
Financial assets	5,049	4,917
Concession Financial Assets [member]
Financial assets of the concession
Financial assets	5,931	5,998
Energy Distribution Concession [Member] | Assets Related To Infrastructure [Member]
Financial assets of the concession
Financial assets	460	396
Transmission Receivable [Member] | Assets Related To Infrastructure [Member]
Financial assets of the concession
Financial assets	1,281	1,296
Generation Receivable [Member] | Assets Related To Infrastructure [Member]
Financial assets of the concession
Financial assets	816	816
Concession Grant Fee [Member] | Assets Related To Infrastructure [Member]
Financial assets of the concession
Financial assets	2,468	2,409
Cva and Other Financial Components In Tariff Adjustments [Member] | Assets Related To Infrastructure [Member]
Financial assets of the concession
Financial assets	882	R$ 1,081
Gas Distribution Concession [Member] | Assets Related To Infrastructure [Member]
Financial assets of the concession
Financial assets	R$ 24

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Disclosure of financial assets of the concession.

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The amount of current financial assets. [Refer: Financial assets]

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The amount of assets that are: (a) cash; (b) an equity instrument of another entity; (c) a contractual right: (i) to receive cash or another financial asset from another entity; or (ii) to exchange financial assets or financial liabilities with another entity under conditions that are potentially favourable to the entity; or (d) a contract that will, or may be, settled in the entity’s own equity instruments and is: (i) a non-derivative for which the entity is, or may be, obliged to receive a variable number of the entity’s own equity instruments; or (ii) a derivative that will, or may be, settled other than by the exchange of a fixed amount of cash or another financial asset for a fixed number of the entity’s own equity instruments. For this purpose the entity’s own equity instruments do not include puttable financial instruments classified as equity instruments in accordance with paragraphs 16A-16B of IAS 32, instruments that impose on the entity an obligation to deliver to another party a pro rata share of the net assets of the entity only on liquidation and are classified as equity instruments in accordance with paragraphs 16C-16D of IAS 32, or instruments that are contracts for the future receipt or delivery of the entity’s own equity instruments. [Refer: Financial instruments, class [member]; Financial liabilities]

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The amount of non-current financial assets. [Refer: Financial assets]

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