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23. OTHER OPERATING INCOME (EXPENSES) (Details) - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Other operating income R$ 824,286 R$ 663,509 R$ 3,610,347
Other operating expenses (646,944) (1,076,730) (1,341,191)
Other operating income (expenses), net 177,342 (413,221) 2,269,156
Taxes and fees      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Other operating expenses (136,348) (88,249) (13,999)
Write-off / (Provision) of judicial deposits      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Other operating expenses (38,258) (64,886) (24,145)
Expenses with environmental liabilities, net      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Other operating expenses (7,156) (5,023) (41,697)
Expenses from tax, social security, labor, civil and environmental law suits      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Other operating expenses (95,744) (151,534) (273,890)
Contractual fines      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Other operating expenses   (16,624) (309)
Depreciation of unused equipment and amortization of intangible assets      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Other operating expenses (44,570) (43,681) (41,068)
Write off of PP&E and Intangible assets      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Other operating expenses (28,127) (88,339) (6,466)
Losses /reversals estimated in inventories      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Other operating expenses (12,903) (17,236) 1,154
Losses on spare parts      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Other operating expenses (2,872) (12,080) (55,790)
Studies and project engineering expenses      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Other operating expenses (32,956) (31,156) (38,138)
Research and development expenses      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Other operating expenses (3,944) (2,269) (3,363)
Advisory expenses      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Other operating expenses (3,419) (20,865) (15,888)
Healthcare plan expenses      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Other operating expenses (97,837) (80,489) (56,838)
Impairment of available-for-sale financial assets      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Other operating expenses     (555,298)
REFIS effect - Law 11,941/09 and Law 12,865/13      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Other operating expenses     (4,801)
Provisions/(Provision) for industrial restructuring      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Other operating expenses 5,807 96,390 (122,854)
Hedge cash flow realized      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Other operating expenses (92,140) (77,444) (11,439)
Impairment of fair value of Transnordestina      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Other operating expenses   (387,989)  
Other expenses      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Other operating expenses (56,477) (85,256) (76,362)
Indemnities/gains on lawsuits      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Other operating income 6,106 26,871 5,189
Rentals and leases      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Other operating income 1,841 1,483 1,150
Reversal of provisions      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Other operating income     5,020
Dividends received      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Other operating income 3,248 567 5,794
Extemporaneous PIS/COFINS credits      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Other operating income   203,504 234,287
Contractual fines      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Other operating income 2,970 2,501 2,200
Gain on business combination      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Other operating income   66,496 3,297,499
Actuarial pension plan      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Other operating income 36,952 48,790 8,702
Monetary adjustment related to the Eletrobras's compulsory loan      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Other operating income [1] 755,151    
Other revenues      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Other operating income R$ 18,018 61,274 R$ 50,506
Gain on sales of assets held for sale      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Other operating income   R$ 252,023  
[1] This is a net amount, certain and due, arising from the final judicial decision favorable to the Company, which is irreversible and irrevocable, in order to apply the STJ's consolidated position on the subject, which culminated in sentencing the Eletrobras to the payment of the correct interest and monetary correction of the Compulsory Loan. The final judicial decision, as well as the certainty about the amounts involved in the settlement of the judgment (judicial procedure to request the satisfaction of the right), allowed the conclusion that the right to receive this value is certain. Thus, in line with our legal and accounting advisors, we recognize the credits in noncurrent assets against the result of Other Operating Revenues.