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10 Accounts Receivables - Concessions (Details 1) - Power Distribution Service Concession [Member] - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Accounts Receivable Concessions [Line Items]    
Balance at beginning R$ 836,818 R$ 783,023
Transfers from contract assets 66,380 28,987
Donations and grants received (1,334)  
Transfers from intangible assets   348
Transfers to other receivables (assets held for disposal)   (1,578)
Fair value recognition 35,306 26,231
Incorporation [1]   (75)
Loss on disposal (1,535) (118)
Balance at ending R$ 783,023 R$ 836,818
[1] Incorporation of assets and equipment through transfer free of charge, of which the amounts were classified in concession related receivables and in intangible assets (Note 18.1).