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Regulatory Charges - Disclosure of Information About Amounts Recognised in Relation to Regulatory Deferral Account Balances (Detail) - BRL (R$)
R$ in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Assets    
Receivable from Eletrobras R$ 4 R$ 138
Liabilities    
Energy Development Account (CDE) 206 189
Aneel inspection charge 2 3
Energy Efficiency 224 288
Research and development 233 234
Energy System Expansion Research 3 3
National Scientific and Technological Development Fund 5 5
Proinfa - Alternative Energy Program 7 8
Royalties for use of water resources 15 23
Emergency capacity charge 31 31
Customer charges - 'Tariff Flag' amounts   17
Liability 763 836
Current liabilities 513 381
Non-current liabilities 250 455
Receivable from Eletrobras - RGR [member]    
Assets    
Receivable from Eletrobras   48
Receivable from Eletrobras - CDE [member]    
Assets    
Receivable from Eletrobras 4 90
Regulatory Assets [member]    
Liabilities    
Global Reversion Reserve (RGR) R$ 37 R$ 35