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Financial Instruments and Risk Management - Summary of Risk of Increase in Inflation Sensitive Analysis (Detail) - BRL (R$) R$ in Millions	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Disclosure of assets and liabilities with significant risk of material adjustment [line items]
Financial assets		R$ 7,453	R$ 5,701
Net assets (liabilities) exposed		(46)	R$ (407)	R$ 1,350	R$ 1,107
Probable Scenario [Member]
Disclosure of assets and liabilities with significant risk of material adjustment [line items]
Financial assets	R$ 4,563
Financial liabilities	(5,010)
Net assets (liabilities) exposed	(447)
Probable Scenario [Member] | Loans, financings and debentures [member]
Disclosure of assets and liabilities with significant risk of material adjustment [line items]
Financial liabilities	(3,964)
Probable Scenario [Member] | Debt agreed with pension fund [Member]
Disclosure of assets and liabilities with significant risk of material adjustment [line items]
Financial liabilities	(751)
Probable Scenario [Member] | Forluz deficit of pension plan [member]
Disclosure of assets and liabilities with significant risk of material adjustment [line items]
Financial liabilities	(295)
Probable Scenario [Member] | IPCA [Member]
Disclosure of assets and liabilities with significant risk of material adjustment [line items]
Net effect of variation in IPCA and IGP-M indices	(18)
Probable Scenario [Member] | Infrastructure -Distribution [Member]
Disclosure of assets and liabilities with significant risk of material adjustment [line items]
Financial assets	116
Probable Scenario [Member] | Transmission Indemnity receivable [member]
Disclosure of assets and liabilities with significant risk of material adjustment [line items]
Financial assets	2,010
Probable Scenario [Member] | Concession Grant Fee [Member]
Disclosure of assets and liabilities with significant risk of material adjustment [line items]
Financial assets	2,437
Possible Scenario [member]
Disclosure of assets and liabilities with significant risk of material adjustment [line items]
Financial assets	4,610
Financial liabilities	(5,061)
Net assets (liabilities) exposed	(451)
Possible Scenario [member] | Loans, financings and debentures [member]
Disclosure of assets and liabilities with significant risk of material adjustment [line items]
Financial liabilities	(4,004)
Possible Scenario [member] | Debt agreed with pension fund [Member]
Disclosure of assets and liabilities with significant risk of material adjustment [line items]
Financial liabilities	(759)
Possible Scenario [member] | Forluz deficit of pension plan [member]
Disclosure of assets and liabilities with significant risk of material adjustment [line items]
Financial liabilities	(298)
Possible Scenario [member] | IPCA [Member]
Disclosure of assets and liabilities with significant risk of material adjustment [line items]
Net effect of variation in IPCA and IGP-M indices	(22)
Possible Scenario [member] | Infrastructure -Distribution [Member]
Disclosure of assets and liabilities with significant risk of material adjustment [line items]
Financial assets	117
Possible Scenario [member] | Transmission Indemnity receivable [member]
Disclosure of assets and liabilities with significant risk of material adjustment [line items]
Financial assets	2,031
Possible Scenario [member] | Concession Grant Fee [Member]
Disclosure of assets and liabilities with significant risk of material adjustment [line items]
Financial assets	2,462
Remote Scenario [member]
Disclosure of assets and liabilities with significant risk of material adjustment [line items]
Financial assets	4,657
Financial liabilities	(5,113)
Net assets (liabilities) exposed	(456)
Remote Scenario [member] | Loans, financings and debentures [member]
Disclosure of assets and liabilities with significant risk of material adjustment [line items]
Financial liabilities	(4,045)
Remote Scenario [member] | Debt agreed with pension fund [Member]
Disclosure of assets and liabilities with significant risk of material adjustment [line items]
Financial liabilities	(767)
Remote Scenario [member] | Forluz deficit of pension plan [member]
Disclosure of assets and liabilities with significant risk of material adjustment [line items]
Financial liabilities	(301)
Remote Scenario [member] | IPCA [Member]
Disclosure of assets and liabilities with significant risk of material adjustment [line items]
Net effect of variation in IPCA and IGP-M indices	(27)
Remote Scenario [member] | Infrastructure -Distribution [Member]
Disclosure of assets and liabilities with significant risk of material adjustment [line items]
Financial assets	118
Remote Scenario [member] | Transmission Indemnity receivable [member]
Disclosure of assets and liabilities with significant risk of material adjustment [line items]
Financial assets	2,052
Remote Scenario [member] | Concession Grant Fee [Member]
Disclosure of assets and liabilities with significant risk of material adjustment [line items]
Financial assets	R$ 2,487
Book value [member]
Disclosure of assets and liabilities with significant risk of material adjustment [line items]
Financial assets		4,376
Financial liabilities		(4,805)
Net assets (liabilities) exposed		(429)
Book value [member] | Loans, financings and debentures [member]
Disclosure of assets and liabilities with significant risk of material adjustment [line items]
Financial liabilities		(3,801)
Book value [member] | Debt agreed with pension fund [Member]
Disclosure of assets and liabilities with significant risk of material adjustment [line items]
Financial liabilities		(721)
Book value [member] | Forluz deficit of pension plan [member]
Disclosure of assets and liabilities with significant risk of material adjustment [line items]
Financial liabilities		(283)
Book value [member] | Infrastructure -Distribution [Member]
Disclosure of assets and liabilities with significant risk of material adjustment [line items]
Financial assets		111
Book value [member] | Transmission Indemnity receivable [member]
Disclosure of assets and liabilities with significant risk of material adjustment [line items]
Financial assets		1,928
Book value [member] | Concession Grant Fee [Member]
Disclosure of assets and liabilities with significant risk of material adjustment [line items]
Financial assets		R$ 2,337

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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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