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36. Related Party Transactions (Details 2)
R$ in Thousands
 12 Months Ended
Dec. 31, 2018
BRL (R$)
DisclosureOfPerformanceBondsLineItems [Line Items]  
Amount endorsement R$ 121,646
Performance Bond Company  
DisclosureOfPerformanceBondsLineItems [Line Items]  
Performance bond company name Matrinchã Transmissora
Final maturity Sep. 30, 2019
Amount insured R$ 90,000
Endorsement percent, Copel GeT 4900.00%
Amount endorsement R$ 44,100
Performance Bond Company  
DisclosureOfPerformanceBondsLineItems [Line Items]  
Performance bond company name Guaraciaba Transmissora
Final maturity Apr. 30, 2020
Amount insured R$ 47,000
Endorsement percent, Copel GeT 4900.00%
Amount endorsement R$ 23,030
Performance Bond Company  
DisclosureOfPerformanceBondsLineItems [Line Items]  
Performance bond company name Mata de Santa Genebra
Final maturity Feb. 14, 2019
Amount insured R$ 78,300
Endorsement percent, Copel GeT 5010.00%
Amount endorsement R$ 39,228
Performance Bond Company  
DisclosureOfPerformanceBondsLineItems [Line Items]  
Performance bond company name Cantareira Transmissora
Final maturity Nov. 30, 2018
Amount insured R$ 31,200
Endorsement percent, Copel GeT 4900.00%
Amount endorsement R$ 15,288