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34 Operating Segments (Details) - BRL (R$)
R$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Disclosure of operating segments [line items]      
ASSETS R$ 46,784,664    
CURRENT ASSETS 11,407,431    
Noncurrent assets 35,377,233    
Long term assets 16,090,279 R$ 10,862,630  
Investments 2,729,517 2,523,179 R$ 2,368,234
Property, plant and equipment 9,495,460 10,592,103  
Intangible assets 6,929,456 6,332,611  
Right-of-use asset 132,521 92,831  
Electric energy GET [member]      
Disclosure of operating segments [line items]      
ASSETS 20,945,910 19,457,551  
CURRENT ASSETS 3,137,219 2,039,443  
Noncurrent assets 17,808,691 17,418,108  
Long term assets 5,561,545 5,054,560  
Investments 2,574,402 2,371,374  
Property, plant and equipment 9,420,859 9,735,093  
Intangible assets 223,222 233,973  
Right-of-use asset 28,663 23,108  
Electric energy DIS [member]      
Disclosure of operating segments [line items]      
ASSETS 20,407,088 13,434,522  
CURRENT ASSETS 6,198,414 4,631,991  
Noncurrent assets 14,208,674 8,802,531  
Long term assets 7,915,662 3,051,058  
Investments 808 813  
Property, plant and equipment  
Intangible assets 6,203,387 5,703,686  
Right-of-use asset 88,817 46,974  
Electric energy Com [member]      
Disclosure of operating segments [line items]      
ASSETS 1,053,099 690,372  
CURRENT ASSETS 390,695 229,630  
Noncurrent assets 662,404 460,742  
Long term assets 660,229 460,312  
Investments 247  
Property, plant and equipment 224 53  
Intangible assets 1,833 123  
Right-of-use asset 118 7  
TEL [member]      
Disclosure of operating segments [line items]      
ASSETS 1,565,593 1,527,098  
CURRENT ASSETS 666,654 528,754  
Noncurrent assets 898,939 998,344  
Long term assets 136,527 137,770  
Investments  
Property, plant and equipment 734,172 833,974  
Intangible assets 16,993 19,844  
Right-of-use asset 11,247 6,756  
GAS [member]      
Disclosure of operating segments [line items]      
ASSETS 749,434 904,993  
CURRENT ASSETS 245,028 313,896  
Noncurrent assets 504,406 591,097  
Long term assets 358,719 576,190  
Investments  
Property, plant and equipment  
Intangible assets 132,366  
Right-of-use asset 13,321 14,907  
HOL [member]      
Disclosure of operating segments [line items]      
ASSETS 4,733,847 3,183,677  
CURRENT ASSETS 2,543,995 1,127,469  
Noncurrent assets 2,189,852 2,056,208  
Long term assets 2,007,064 1,879,619  
Investments 154,307 150,746  
Property, plant and equipment 24,500 22,983  
Intangible assets 2,379 1,781  
Right-of-use asset 1,602 1,079  
Reclassifications note 40 [member]      
Disclosure of operating segments [line items]      
ASSETS (1,230,546)    
CURRENT ASSETS (380,954)    
Noncurrent assets (849,592)    
Long term assets (110,834)    
Investments    
Property, plant and equipment (716,924)    
Intangible assets (10,587)    
Right-of-use asset (11,247)    
Intersegment operations [member]      
Disclosure of operating segments [line items]      
ASSETS (1,439,761) (885,662)  
CURRENT ASSETS (1,393,620) (961,987)  
Noncurrent assets (46,141) 76,325  
Long term assets (438,633) (296,879)  
Investments  
Property, plant and equipment 32,629  
Intangible assets 359,863 373,204  
Right-of-use asset