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1 Operations (Details 2)
 12 Months Ended
Dec. 31, 2019
Dona Francisca Energetica S.A. [Member]  
Disclosure of associates [line items]  
Associate name Dona Francisca Energética S.A.
Headquarters Agudo/RS
Main activity Production of electricity
Interest 23.0303%
Investor Copel
Foz do Chopim Energetica Ltda. [Member]  
Disclosure of associates [line items]  
Associate name Foz do Chopim Energética Ltda.
Headquarters Curitiba/PR
Main activity Production of electricity
Interest 35.77%
Investor Copel GeT
Carbocampel S.A. [Member]  
Disclosure of associates [line items]  
Associate name Carbocampel S.A.
Headquarters Figueira/PR
Main activity Coal exploration
Interest 49.00%
Investor Copel
Copel Amec S/C Ltda. - in liquidation [Member]  
Disclosure of associates [line items]  
Associate name Copel Amec S/C Ltda. - in liquidation
Headquarters Curitiba/PR
Main activity Services
Interest 48.00%
Investor Copel
Sercomtel S.A. Telecomunicacoes [Member]  
Disclosure of associates [line items]  
Associate name Sercomtel S.A. Telecomunicações [1]
Headquarters Londrina/PR [1]
Main activity Telecommunications [1]
Interest 45.00% [1]
Investor Copel [1]
Domino Holdings Ltda. [Member]  
Disclosure of associates [line items]  
Associate name Dominó Holdings Ltda.
Headquarters Curitiba/PR
Main activity Interests in companies
Interest 49.00%
Investor Copel Energia
Estacao Osasco Desenvolvimento Lmobiliario S.A. [Member]  
Disclosure of associates [line items]  
Associate name Estação Osasco Desenvolvimento Imobiliário S.A. [2]
Headquarters São Paulo/SP [2]
Main activity Incorporation of real estate projects [2]
Interest 18.78% [2]
Investor UEG [2]
[1] Investment reduced to zero due to the impairment tests.
[2] Pre-operating stage.