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26. Research and Development and Energy Efficiency (Details) - BRL (R$)
R$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
DisclosureOfResearchAndDevelopmentAndEnergyEfficiencyLineItems [Line Items]      
Amounts payable, before any related prepayments R$ 151,485    
Amounts payable to regulatory agencies 22,878    
Other amounts payable 418,372    
Research and development and energy efficiency 592,735 R$ 532,475 R$ 483,889
Research and development and energy efficiency, current 270,429 282,766  
Research and development and energy efficiency, noncurrent 322,306 249,709  
MME      
DisclosureOfResearchAndDevelopmentAndEnergyEfficiencyLineItems [Line Items]      
Research and development and energy efficiency 2,361 2,616 R$ 2,302
Research and Development - R&D      
DisclosureOfResearchAndDevelopmentAndEnergyEfficiencyLineItems [Line Items]      
Amounts payable, before any related prepayments 129,159    
Amounts payable to regulatory agencies 7,086    
Other amounts payable 198,467    
Research and development and energy efficiency 334,712 323,969  
Research and Development - R&D | National Fund for Scientific and Technological Development - FNDCT      
DisclosureOfResearchAndDevelopmentAndEnergyEfficiencyLineItems [Line Items]      
Amounts payable, before any related prepayments 0    
Amounts payable to regulatory agencies 4,725    
Other amounts payable 0    
Research and development and energy efficiency 4,725 5,232  
Research and Development - R&D | MME      
DisclosureOfResearchAndDevelopmentAndEnergyEfficiencyLineItems [Line Items]      
Amounts payable, before any related prepayments 0    
Amounts payable to regulatory agencies 2,361    
Other amounts payable 0    
Research and development and energy efficiency 2,361 2,616  
Research and Development - R&D | R&D      
DisclosureOfResearchAndDevelopmentAndEnergyEfficiencyLineItems [Line Items]      
Amounts payable, before any related prepayments 129,159    
Amounts payable to regulatory agencies 0    
Other amounts payable 198,467    
Research and development and energy efficiency 327,626 316,121  
Energy efficiency program - EEP      
DisclosureOfResearchAndDevelopmentAndEnergyEfficiencyLineItems [Line Items]      
Amounts payable, before any related prepayments 22,326    
Amounts payable to regulatory agencies 15,792    
Other amounts payable 219,905    
Research and development and energy efficiency 258,023 208,506  
Energy efficiency program - EEP | National Program of electricity conservation - Procel      
DisclosureOfResearchAndDevelopmentAndEnergyEfficiencyLineItems [Line Items]      
Amounts payable, before any related prepayments 0    
Amounts payable to regulatory agencies 15,792    
Other amounts payable 0    
Research and development and energy efficiency 15,792 6,041  
Energy efficiency program - EEP | EEP      
DisclosureOfResearchAndDevelopmentAndEnergyEfficiencyLineItems [Line Items]      
Amounts payable, before any related prepayments 22,326    
Amounts payable to regulatory agencies 0    
Other amounts payable 219,905    
Research and development and energy efficiency R$ 242,231 R$ 202,465