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17 Property, Plant and Equipment (Details 2) - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Disclosure of joint operations [line items]    
Joint operations R$ 1,393,501 R$ 1,423,708
In Progress [Member]    
Disclosure of joint operations [line items]    
Joint operations R$ 722,795 717,599
In Progress [Member] | HPP Baixo Iguacu [Member]    
Disclosure of joint operations [line items]    
Share 30.00%  
Joint operations R$ 49,240 717,599
In Progress [Member] | Accumulated Depreciation [Member]    
Disclosure of joint operations [line items]    
Annual average depreciation rate 3.27%  
Joint operations R$ (19,038)  
In Service [Member]    
Disclosure of joint operations [line items]    
Joint operations 670,706 683,371
In Service [Member] | HPP Baixo Iguacu [Member]    
Disclosure of joint operations [line items]    
Joint operations R$ 692,593  
In Service [Member] | Accumulated Depreciation [Member]    
Disclosure of joint operations [line items]    
Annual average depreciation rate 3.43%  
Joint operations R$ (206,000) (176,546)
In Service [Member] | HPP Maua (Consorcio Energetico Cruzeiro do Sul) [Member]    
Disclosure of joint operations [line items]    
Share 51.00%  
Joint operations R$ 859,917 R$ 859,917