XML 113 R106.htm IDEA: XBRL DOCUMENT v3.8.0.1
Concession Financial Assets and Liabilities - Additional Information (Detail)
R$ in Millions
 11 Months Ended 12 Months Ended
Jul. 01, 2016
BRL (R$)
Jan. 04, 2016
BRL (R$)
Nov. 30, 2017
BRL (R$)
Dec. 31, 2017
BRL (R$)
Dec. 31, 2016
BRL (R$)
Plant
Dec. 31, 2015
BRL (R$)
Aug. 16, 2016
BRL (R$)
Dec. 31, 2014
BRL (R$)
Disclosure Of Financial Assets and Liabilities Of The Concession [Line Items]                
Homologated amount             R$ 892  
Financial assets       R$ 7,453 R$ 5,701      
Remuneration payment period       8 years        
Extensions of concessions, tariff maximum amount       R$ 993        
Extension of the concessions       316        
Adjustment of BRR of transmission assets       149        
Transmission assets receivable       75        
Adjusted regulatory remuneration base of assets       544        
Net balance of assets deemed cost       816 547      
Investments       7,792 R$ 8,694 R$ 9,717   R$ 8,040
Grant acquisition period         30 years      
Acquisition payment percentage 35.00% 65.00%            
Remaining 35% of acquisition payment   R$ 776            
Remaining 35% of acquisition payment updated R$ 828              
Pass-throughs of funds     R$ 583 586 R$ 341 R$ 1,124    
Jaguara hydroelectric plant [member]                
Disclosure Of Financial Assets and Liabilities Of The Concession [Line Items]                
Investments       174        
Sao simao hydroelectric plant [member]                
Disclosure Of Financial Assets and Liabilities Of The Concession [Line Items]                
Investments       3        
Miranda hydroelectric plant [member]                
Disclosure Of Financial Assets and Liabilities Of The Concession [Line Items]                
Investments       23        
Subsidiaries [member]                
Disclosure Of Financial Assets and Liabilities Of The Concession [Line Items]                
Transmission assets receivable       548        
Financial assets [member]                
Disclosure Of Financial Assets and Liabilities Of The Concession [Line Items]                
Financial assets       7,084 5,303      
Transmission Indemnity receivable [member] | Financial assets [member]                
Disclosure Of Financial Assets and Liabilities Of The Concession [Line Items]                
Financial assets       R$ 1,928        
Customer Charges - Tariff Flag Amounts [member]                
Disclosure Of Financial Assets and Liabilities Of The Concession [Line Items]                
Pass-throughs of funds         R$ 3      
Other disposals of assets [member] | Regulated market [member]                
Disclosure Of Financial Assets and Liabilities Of The Concession [Line Items]                
Output sales percentage       70.00%        
Other disposals of assets [member] | Electricity acquired in the Free Market [member]                
Disclosure Of Financial Assets and Liabilities Of The Concession [Line Items]                
Output sales percentage       30.00%        
Hydro electric Plant [member]                
Disclosure Of Financial Assets and Liabilities Of The Concession [Line Items]                
Number of plants | Plant         18      
Cost of acquisition         R$ 2,216