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34 Operating Segments (Details 2) - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Disclosure of operating segments [line items]      
Contract Assets R$ 1,293,765 R$ 935,167 R$ 813,450
Property, plant and equipment 366,298 582,259 1,469,480
Intangible assets 10,991 5,032 7,589
Right-of-use asset 103,571 127,375  
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 236,914 522,744 1,160,967
Intangible assets 7,397 4,272 6,351
Right-of-use asset 19,231 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 1,278,578 917,577 797,832
Property, plant and equipment
Intangible assets
Right-of-use asset 72,421 66,621  
IFRS 16 Initial adoption   60,494  
Additions for the period   6,127  
Electric energy Com [member]      
Disclosure of operating segments [line items]      
Contract Assets
Property, plant and equipment 203 14 4
Intangible assets 1,741 3
Right-of-use asset 135 8  
IFRS 16 Initial adoption    
Additions for the period   8  
TEL [member]      
Disclosure of operating segments [line items]      
Contract Assets
Property, plant and equipment 127,381 59,216 308,242
Intangible assets 808 486 1,235
Right-of-use asset 10,135 9,950  
IFRS 16 Initial adoption   9,868  
Additions for the period   82  
GAS [member]      
Disclosure of operating segments [line items]      
Contract Assets 15,187 17,590 15,618
Property, plant and equipment
Intangible assets
Right-of-use asset 623 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 1,800 285 267
Intangible assets 1,045 271 R$ 3
Right-of-use asset R$ 1,026 402  
IFRS 16 Initial adoption   385  
Additions for the period   R$ 17