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Operating Costs and Expenses - Schedule of Outsourced Services (Details) - BRL (R$)
R$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Total R$ 1,458 R$ 1,052 R$ 682
Operating Cost [Member]      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Total 1,902 1,706 1,450
Meter reading and bill delivery [Member] | Operating Cost [Member]      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Total 161 146 134
Communication [Member] | Operating Cost [Member]      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Total 169 153 148
Maintenance and conservation of electrical facilities and equipment [Member] | Operating Cost [Member]      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Total 708 589 485
Building conservation and cleaning [Member] | Operating Cost [Member]      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Total 85 73 72
Security services [Member] | Operating Cost [Member]      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Total 20 17 17
Consultancy [Member] | Operating Cost [Member]      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Total 21 39 43
Information technology [Member] | Operating Cost [Member]      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Total 174 146 93
Disconnection and reconnection [Member] | Operating Cost [Member]      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Total 87 90 82
Legal services and procedural costs [Member] | Operating Cost [Member]      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Total 32 40 32
Environment services [Member] | Operating Cost [Member]      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Total 58 49 46
Cleaning of power line pathways [Member] | Operating Cost [Member]      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Total 117 91 92
Copying and legal publications [Member] | Operating Cost [Member]      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Total 17 18 18
Inspection of Customers [Member] | Operating Cost [Member]      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Total 45 41 33
Other [member] | Operating Cost [Member]      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Total R$ 208 R$ 214 R$ 155