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42 Condensed individual financial information of Companhia Paranaense de Energia - Copel (Details 3) - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
CondensedUnconsolidatedFinancialInformationOfCompanhiaParanaenseDeEnergiaCopelLineItems [Line Items]      
NET CASH GENERATED IN OPERATING ACTIVITIES R$ 3,940,844    
CASH FLOWS FROM INVESTMENT ACTIVITIES      
Financial investments (48,238)    
Additions in investments (72,439)    
Capital reduction of investees 228    
Additions to property, plant and equipment (226,325)    
Additions to intangible assets (10,225)    
NET CASH USED IN INVESTING ACTIVITIES (1,667,571)    
CASH FLOWS FROM FINANCING ACTIVITIES      
Dividends and interest on own capital paid (626,357)    
NET CASH GENERATED FROM (USED IN) FINANCING ACTIVITIES (1,715,113)    
Cash and cash equivalents at the beginning of the period 2,941,727    
Cash and cash equivalents at the end of the period 3,222,768 R$ 2,941,727  
Companhia Paranaense de Energia - Copel [member]      
CondensedUnconsolidatedFinancialInformationOfCompanhiaParanaenseDeEnergiaCopelLineItems [Line Items]      
NET CASH GENERATED IN OPERATING ACTIVITIES 761,050 688,443 R$ 653,230
CASH FLOWS FROM INVESTMENT ACTIVITIES      
Financial investments 5,349 115,376 (124,254)
Loans and financing granted to related parties (40,000) (24,410) (192,445)
Receipt of loans and financing granted to related parties (7,015) 24,512 560,877
Additions in investments (68,127) (271,968) (608,934)
Capital reduction of investees 228   45,000
Additions to property, plant and equipment (1,800) (285) (267)
Additions to intangible assets (1,045) (271) (3)
NET CASH USED IN INVESTING ACTIVITIES (98,380) (157,046) (320,026)
CASH FLOWS FROM FINANCING ACTIVITIES      
Issue of Debentures   500,000 600,000
Issue of loans with related parties 280,000 48,000  
Amortization of principal - loans and financing (38,500) (115,500) (77,000)
Amortization of principal - debentures (300,000) (853,400) (333,300)
Amortization of loans obtained from related parties   (48,000)  
Amortization of principal - Lease liabilities (329) (141)  
Dividends and interest on own capital paid (586,445) (352,055) (264,734)
NET CASH GENERATED FROM (USED IN) FINANCING ACTIVITIES (645,274) (821,096) (75,034)
Changes in cash and cash equivalents 17,396 (289,699) 258,170
Cash and cash equivalents at the beginning of the period 25,304 315,003 56,833
Cash and cash equivalents at the end of the period R$ 42,700 R$ 25,304 R$ 315,003