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18 Intangible Assets (Details) - BRL (R$)
R$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Disclosure of detailed information about intangible assets [line items]      
Intangible Assets R$ 6,332,611 R$ 6,029,097  
Distribution Concession Agreement [Member]      
Disclosure of detailed information about intangible assets [line items]      
Intangible Assets 5,703,686 5,390,063  
Generation Concession Agreement [Member]      
Disclosure of detailed information about intangible assets [line items]      
Intangible Assets 582,671 593,852 R$ 619,221
Gas Distribution [Member]      
Disclosure of detailed information about intangible assets [line items]      
Intangible Assets 3,619 R$ 43,888
Other Intangible Assets [Member]      
Disclosure of detailed information about intangible assets [line items]      
Intangible Assets 46,254 41,563  
Other [Member]      
Disclosure of detailed information about intangible assets [line items]      
Intangible Assets R$ 46,254 R$ 41,563