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34 Operating Segments (Details 2) - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Disclosure of operating segments [line items]      
Contract Assets R$ 935,167 R$ 813,450  
Property, plant and equipment 582,259 1,469,480 R$ 1,316,415
Intangible assets 5,032 7,589 778,386
Right-of-use asset 9,353    
IFRS 16 Initial adoption 118,022    
Additions for the period 9,353    
Electric Energy GET [Member]      
Disclosure of operating segments [line items]      
Contract Assets  
Property, plant and equipment 522,744 1,160,967 1,077,088
Intangible assets 4,272 6,351 3,996
Right-of-use asset 33,461    
IFRS 16 Initial adoption 32,919    
Additions for the period 542    
Electric Energy DIS [Member]      
Disclosure of operating segments [line items]      
Contract Assets 917,577 797,832  
Property, plant and equipment
Intangible assets 757,709
Right-of-use asset 66,621    
IFRS 16 Initial adoption 60,494    
Additions for the period 6,127    
Com [Member]      
Disclosure of operating segments [line items]      
Contract Assets  
Property, plant and equipment 14 4 7
Intangible assets 3 101
Right-of-use asset 8    
IFRS 16 Initial adoption    
Additions for the period 8    
TEL [Member]      
Disclosure of operating segments [line items]      
Contract Assets  
Property, plant and equipment 59,216 308,242 238,944
Intangible assets 486 1,235 2,200
Right-of-use asset 9,950    
IFRS 16 Initial adoption 9,868    
Additions for the period 82    
GAS [Member]      
Disclosure of operating segments [line items]      
Contract Assets 17,590 15,618  
Property, plant and equipment
Intangible assets 13,745
Right-of-use asset 16,933    
IFRS 16 Initial adoption 14,356    
Additions for the period 2,577    
HOL [Member]      
Disclosure of operating segments [line items]      
Contract Assets  
Property, plant and equipment 285 267 376
Intangible assets 271 R$ 3 R$ 635
Right-of-use asset 402    
IFRS 16 Initial adoption 385    
Additions for the period R$ 17