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10. Accounts Receivable Concessions (Details 3) - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Accounts Receivable Concessions Details 3Abstract    
Bonus from the grant, beginning R$ 606,479 R$ 586,706
Transfers to electricity grid use charges - customers (66,693) (62,387)
Interest 85,986 82,160
Bonus from the grant, ending R$ 625,772 R$ 606,479