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10. Accounts Receivable Concessions (Details 4) - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Accounts Receivable Concessions Details 4Abstract    
Transmission concession agreement, beginning R$ 1,497,399 R$ 1,342,055
Transfers to contract assets (1,497,399)  
Transfers to electricity grid use charges - customers   (81,497)
Transfers to property, plant and equipment   (29,264)
Remuneration   129,769
Construction income   136,336
Transmission concession agreement, ending R$ 0 R$ 1,497,399