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1 Operations (Details Narrative) - BRL (R$)
R$ in Thousands
 12 Months Ended
Jan. 02, 2019
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Mar. 31, 2019
Disclosure of joint ventures [line items]          
Percentage interest in shares of acquired   100.00%      
Net operating revenue increased R$ 10,792        
Net operating revenue 16,255,066 R$ 105,184      
Net income increased 7,682        
Net income R$ 2,070,551 R$ 2,062,869 R$ 1,444,004 R$ 1,118,255  
Description of business combination   The business combination occurred with the payment of R$ 133,739, corresponding to 100% of SPE Uirapuru shares, of which R$ 142 was paid in December 2018 and R$ 133,597 during the first half of 2019. Considering the cash acquired from the subsidiary, in the amount of R$ 9,803, we have a net cash effect for the Company of R$ 123,936 (R$ 142 in 2018 and R$ 123,794 in 2019).      
SPE Uirapuru Transmissora de Energia S.A. [Member] | Share Purchase and Sale Agreement [Member]          
Disclosure of joint ventures [line items]          
Percentage interest in shares of acquired         100.00%