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19. Intangible Assets (Details) - BRL (R$)
R$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Disclosure of detailed information about intangible assets [line items]      
Intangible Assets R$ 6,029,097 R$ 6,452,824  
Distribution concession agreement      
Disclosure of detailed information about intangible assets [line items]      
Intangible Assets 5,390,063 5,750,873 R$ 5,513,381
Generation concession agreements/authorization      
Disclosure of detailed information about intangible assets [line items]      
Intangible Assets 593,852 619,221  
Concession agreement - gas distribution      
Disclosure of detailed information about intangible assets [line items]      
Intangible Assets 3,619 43,888  
Others      
Disclosure of detailed information about intangible assets [line items]      
Intangible Assets R$ 41,563 R$ 38,842