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34. Operating Segments (Details 2) - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Disclosure of operating segments [line items]      
Contract Assets R$ 813,450    
Property, plant and equipment 1,469,480 R$ 1,316,415 R$ 807,833
Intangible assets 7,589 778,386 928,727
Electric Energy GET      
Disclosure of operating segments [line items]      
Contract Assets 0    
Property, plant and equipment 1,160,967 1,077,088 619,964
Intangible assets 6,351 3,996 3,207
Electric Energy DIS      
Disclosure of operating segments [line items]      
Contract Assets 797,832    
Property, plant and equipment 0 0 0
Intangible assets 0 757,709 892,693
TEL      
Disclosure of operating segments [line items]      
Contract Assets 0    
Property, plant and equipment 308,242 238,944 187,313
Intangible assets 1,235 2,200 6,447
GAS      
Disclosure of operating segments [line items]      
Contract Assets 15,618    
Property, plant and equipment 0 0 0
Intangible assets 0 13,745 25,847
COM      
Disclosure of operating segments [line items]      
Contract Assets 0    
Property, plant and equipment 4 7  
Intangible assets 0 101  
HOL      
Disclosure of operating segments [line items]      
Contract Assets 0    
Property, plant and equipment 267 376 556
Intangible assets R$ 3 R$ 635 R$ 533