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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, 2019	Dec. 31, 2018	Dec. 31, 2017
Disclosure of assets and liabilities with significant risk of material adjustment [line items]
Financial assets		R$ 16,279	R$ 16,866
Financial liabilities		18,120	R$ 19,556
Probable scenario [member]
Disclosure of assets and liabilities with significant risk of material adjustment [line items]
Financial assets	R$ 4,782
Financial liabilities	(5,018)
Net liability exposed	(236)
Probable scenario [member] | IGPM [member]
Disclosure of assets and liabilities with significant risk of material adjustment [line items]
Financial assets	258
Probable scenario [member] | IGPM index [member]
Disclosure of assets and liabilities with significant risk of material adjustment [line items]
Financial assets	256
Probable scenario [member] | Loans, financing and debentures [member]
Disclosure of assets and liabilities with significant risk of material adjustment [line items]
Financial liabilities	(3,946)
Probable scenario [member] | Debt with pension fund [Member]
Disclosure of assets and liabilities with significant risk of material adjustment [line items]
Financial liabilities	(679)
Probable scenario [member] | Forluz deficit of pension plan [member]
Disclosure of assets and liabilities with significant risk of material adjustment [line items]
Financial liabilities	(393)
Probable scenario [member] | IPCA [member]
Disclosure of assets and liabilities with significant risk of material adjustment [line items]
Net effect of fluctuation in IPCA and IGP-M indices	(9)
Possible scenario [member]
Disclosure of assets and liabilities with significant risk of material adjustment [line items]
Financial assets	4,830
Financial liabilities	(5,067)
Net liability exposed	(237)
Possible scenario [member] | IGPM [member]
Disclosure of assets and liabilities with significant risk of material adjustment [line items]
Financial assets	260
Possible scenario [member] | IGPM index [member]
Disclosure of assets and liabilities with significant risk of material adjustment [line items]
Financial assets	259
Possible scenario [member] | Loans, financing and debentures [member]
Disclosure of assets and liabilities with significant risk of material adjustment [line items]
Financial liabilities	(3,985)
Possible scenario [member] | Debt with pension fund [Member]
Disclosure of assets and liabilities with significant risk of material adjustment [line items]
Financial liabilities	(685)
Possible scenario [member] | Forluz deficit of pension plan [member]
Disclosure of assets and liabilities with significant risk of material adjustment [line items]
Financial liabilities	(397)
Possible scenario [member] | IPCA [member]
Disclosure of assets and liabilities with significant risk of material adjustment [line items]
Net effect of fluctuation in IPCA and IGP-M indices	(10)
Remote scenario [member]
Disclosure of assets and liabilities with significant risk of material adjustment [line items]
Financial assets	4,878
Financial liabilities	(5,117)
Net liability exposed	(239)
Remote scenario [member] | IGPM [member]
Disclosure of assets and liabilities with significant risk of material adjustment [line items]
Financial assets	263
Remote scenario [member] | IGPM index [member]
Disclosure of assets and liabilities with significant risk of material adjustment [line items]
Financial assets	262
Remote scenario [member] | Loans, financing and debentures [member]
Disclosure of assets and liabilities with significant risk of material adjustment [line items]
Financial liabilities	(4,024)
Remote scenario [member] | Debt with pension fund [Member]
Disclosure of assets and liabilities with significant risk of material adjustment [line items]
Financial liabilities	(692)
Remote scenario [member] | Forluz deficit of pension plan [member]
Disclosure of assets and liabilities with significant risk of material adjustment [line items]
Financial liabilities	(401)
Remote scenario [member] | IPCA [member]
Disclosure of assets and liabilities with significant risk of material adjustment [line items]
Net effect of fluctuation in IPCA and IGP-M indices	(12)
Infrastructure -Distribution [member] | Probable scenario [member]
Disclosure of assets and liabilities with significant risk of material adjustment [line items]
Financial assets	412
Infrastructure -Distribution [member] | Possible scenario [member]
Disclosure of assets and liabilities with significant risk of material adjustment [line items]
Financial assets	416
Infrastructure -Distribution [member] | Remote scenario [member]
Disclosure of assets and liabilities with significant risk of material adjustment [line items]
Financial assets	420
Transmission Indemnity receivable [member] | Probable scenario [member]
Disclosure of assets and liabilities with significant risk of material adjustment [line items]
Financial assets	1,349
Transmission Indemnity receivable [member] | Possible scenario [member]
Disclosure of assets and liabilities with significant risk of material adjustment [line items]
Financial assets	1,363
Transmission Indemnity receivable [member] | Remote scenario [member]
Disclosure of assets and liabilities with significant risk of material adjustment [line items]
Financial assets	1,376
Concession grant fee Generation concessions [member] | Probable scenario [member]
Disclosure of assets and liabilities with significant risk of material adjustment [line items]
Financial assets	2,507
Concession grant fee Generation concessions [member] | Possible scenario [member]
Disclosure of assets and liabilities with significant risk of material adjustment [line items]
Financial assets	2,532
Concession grant fee Generation concessions [member] | Remote scenario [member]
Disclosure of assets and liabilities with significant risk of material adjustment [line items]
Financial assets	R$ 2,557
Book value [member]
Disclosure of assets and liabilities with significant risk of material adjustment [line items]
Financial assets		4,594
Financial liabilities		(4,821)
Net liability exposed		(227)
Book value [member] | IGPM [member]
Disclosure of assets and liabilities with significant risk of material adjustment [line items]
Financial assets		247
Book value [member] | IGPM index [member]
Disclosure of assets and liabilities with significant risk of material adjustment [line items]
Financial assets		246
Book value [member] | Loans, financing and debentures [member]
Disclosure of assets and liabilities with significant risk of material adjustment [line items]
Financial liabilities		(3,791)
Book value [member] | Debt with pension fund [Member]
Disclosure of assets and liabilities with significant risk of material adjustment [line items]
Financial liabilities		(652)
Book value [member] | Forluz deficit of pension plan [member]
Disclosure of assets and liabilities with significant risk of material adjustment [line items]
Financial liabilities		(378)
Book value [member] | Infrastructure -Distribution [member]
Disclosure of assets and liabilities with significant risk of material adjustment [line items]
Financial assets		396
Book value [member] | Transmission Indemnity receivable [member]
Disclosure of assets and liabilities with significant risk of material adjustment [line items]
Financial assets		1,296
Book value [member] | Concession grant fee Generation concessions [member]
Disclosure of assets and liabilities with significant risk of material adjustment [line items]
Financial assets		R$ 2,409

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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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