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34 Operating Segments (Details) - BRL (R$)
R$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Disclosure of operating segments [line items]      
ASSETS R$ 38,312,550 R$ 35,930,100  
CURRENT ASSETS 7,909,196 6,677,846  
NON-CURRENT ASSETS 30,403,354 29,252,254  
Long term assets 10,862,630 10,014,260  
Investments 2,523,179 2,368,234 R$ 2,570,643 [1]
Property, plant and equipment 10,592,103 10,840,663 R$ 9,829,450
Intangible assets 6,332,611 6,029,097  
Right-of-use asset 92,831    
Electric Energy GET [Member]      
Disclosure of operating segments [line items]      
ASSETS 19,457,551 18,573,953  
CURRENT ASSETS 2,039,443 1,722,519  
NON-CURRENT ASSETS 17,418,108 16,851,434  
Long term assets 5,054,560 4,660,867  
Investments 2,371,374 2,212,271  
Property, plant and equipment 9,735,093 9,728,872  
Intangible assets 233,973 249,424  
Right-of-use asset 23,108    
Electric Energy DIS [Member]      
Disclosure of operating segments [line items]      
ASSETS 13,434,522 12,331,603  
CURRENT ASSETS 4,631,991 3,971,915  
NON-CURRENT ASSETS 8,802,531 8,359,688  
Long term assets 3,051,058 2,968,282  
Investments 813 1,343  
Property, plant and equipment  
Intangible assets 5,703,686 5,390,063  
Right-of-use asset 46,974    
Com [Member]      
Disclosure of operating segments [line items]      
ASSETS 690,372 227,287  
CURRENT ASSETS 229,630 181,077  
NON-CURRENT ASSETS 460,742 46,210  
Long term assets 460,312 43,564  
Investments 247 2,442  
Property, plant and equipment 53 51  
Intangible assets 123 153  
Right-of-use asset 7    
TEL [Member]      
Disclosure of operating segments [line items]      
ASSETS 1,527,098 1,264,748  
CURRENT ASSETS 528,754 88,239  
NON-CURRENT ASSETS 998,344 1,176,509  
Long term assets 137,770 88,798  
Investments  
Property, plant and equipment 833,974 1,071,489  
Intangible assets 19,844 16,222  
Right-of-use asset 6,756    
GAS [Member]      
Disclosure of operating segments [line items]      
ASSETS 904,993 675,286  
CURRENT ASSETS 313,896 204,725  
NON-CURRENT ASSETS 591,097 470,561  
Long term assets 576,190 466,942  
Investments  
Property, plant and equipment  
Intangible assets 3,619  
Right-of-use asset 14,907    
HOL [Member]      
Disclosure of operating segments [line items]      
ASSETS 3,183,677 3,359,407  
CURRENT ASSETS 1,127,469 1,214,523  
NON-CURRENT ASSETS 2,056,208 2,144,884  
Long term assets 1,879,619 1,950,280  
Investments 150,746 152,178  
Property, plant and equipment 22,983 40,251  
Intangible assets 1,781 2,175  
Right-of-use asset 1,079    
Intersegment Operations [Member]      
Disclosure of operating segments [line items]      
ASSETS (885,662) (502,184)  
CURRENT ASSETS (961,987) (705,152)  
NON-CURRENT ASSETS 76,325 202,968  
Long term assets (296,879) (164,473)  
Investments  
Property, plant and equipment  
Intangible assets 373,204 R$ 367,441  
Right-of-use asset    
[1] As of December 31, 2017, the joint ventures operating in the transmission segment had their electricity transmission concession agreements classified as financial assets within the scope of IAS 39 and IFRIC 12. With the entry into force on January 1, 2018 of IFRS 15, bringing the concept of the right to receive the infrastructure investments conditioned to the fulfillment of performance obligations to operate and maintain the infrastructure and not only by the passage of time, the electricity transmission concession agreements started being classified as contract assets. As a result, the balance of the financial assets of the joint ventures started being classified on January 1, 2018 as contract assets in accordance with the Company's practices, with a reduction in its measurement in the amount of R$148,748 with effect in the Company in the caption Investments, by equity. At the transition, the Company and its joint ventures opted to adopt the standard on the date of initial application as an adjustment to the opening balance, in equity account, considering only agreements outstanding prior to the date of application, as set forth in IFRS 15.