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34. Operating Segments (Details) - BRL (R$)
R$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Disclosure of operating segments [line items]      
ASSETS R$ 35,930,100 R$ 33,162,377  
CURRENT ASSETS 6,677,846 5,701,834  
NON-CURRENT ASSETS 29,252,254 27,460,543  
Long Term Assets 10,014,260 8,607,626  
Investments 2,368,234 2,570,643 R$ 2,344,512
Property, Plant and Equipment 10,840,663 9,829,450 R$ 8,934,303
Intangible Assets 6,029,097 6,452,824  
Electric Energy GET      
Disclosure of operating segments [line items]      
ASSETS 18,573,953 17,110,518  
CURRENT ASSETS 1,700,739 1,461,512  
NON-CURRENT ASSETS 16,864,244 15,649,006  
Long Term Assets 4,660,867 4,037,312  
Investments 2,225,081 2,424,081  
Property, Plant and Equipment 9,728,872 8,924,508  
Intangible Assets 249,424 263,105  
Electric Energy DIS      
Disclosure of operating segments [line items]      
ASSETS 12,331,603 11,529,588  
CURRENT ASSETS 3,971,915 3,609,663  
NON-CURRENT ASSETS 8,359,688 7,919,925  
Long Term Assets 2,968,282 2,167,690  
Investments 1,343 1,362  
Property, Plant and Equipment 0 0  
Intangible Assets 5,390,063 5,750,873  
TEL      
Disclosure of operating segments [line items]      
ASSETS 1,264,748 1,054,741  
CURRENT ASSETS 88,239 102,002  
NON-CURRENT ASSETS 1,176,509 952,739  
Long Term Assets 88,798 69,543  
Investments 0 0  
Property, Plant and Equipment 1,071,489 866,489  
Intangible Assets 16,222 16,707  
GAS      
Disclosure of operating segments [line items]      
ASSETS 675,286 632,910  
CURRENT ASSETS 204,725 151,966  
NON-CURRENT ASSETS 470,561 480,944  
Long Term Assets 466,942 437,056  
Investments 0 0  
Property, Plant and Equipment 0 0  
Intangible Assets 3,619 43,888  
COM      
Disclosure of operating segments [line items]      
ASSETS 227,287 208,369  
CURRENT ASSETS 181,078 187,966  
NON-CURRENT ASSETS 46,209 20,403  
Long Term Assets 43,564 17,703  
Investments 2,441 2,457  
Property, Plant and Equipment 51 57  
Intangible Assets 153 186  
HOL      
Disclosure of operating segments [line items]      
ASSETS 3,371,844 3,211,162  
CURRENT ASSETS 1,226,960 1,035,545  
NON-CURRENT ASSETS 2,144,884 2,175,617  
Long Term Assets 1,950,280 2,019,192  
Investments 152,178 115,765  
Property, Plant and Equipment 40,251 38,396  
Intangible Assets 2,175 2,264  
Intersegment operations      
Disclosure of operating segments [line items]      
ASSETS (496,065) (584,911)  
CURRENT ASSETS (699,033) (846,820)  
NON-CURRENT ASSETS 202,968 261,909  
Long Term Assets (164,473) (140,870)  
Investments 0 26,978  
Property, Plant and Equipment 0 0  
Intangible Assets R$ 367,441 R$ 375,801