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32 Operating Costs and Expenses (Details 4) - BRL (R$) R$ in Thousands | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Disclosure of operating costs and expenses [line items] |  |  |
Credit losses, provisions and reversals | R$ 374,815 | R$ 306,697 | R$ 365,539
Provision For Litigations [Member] |  |  |
Disclosure of operating costs and expenses [line items] |  |  |
Credit losses, provisions and reversals | 257,921 | 219,636 | 386,373
Power Generation Concession Contract [Member] |  |  |
Disclosure of operating costs and expenses [line items] |  |  |
Credit losses, provisions and reversals | (2,945) | (4,758) | (1,117)
Credits On Sales And Purchases Of Gas [Member] |  |  |
Disclosure of operating costs and expenses [line items] |  |  |
Credit losses, provisions and reversals |  | (4,758) | (123,586)
Property Plant And Equipment Generation Segment [Member] |  |  |
Disclosure of operating costs and expenses [line items] |  |  |
Credit losses, provisions and reversals | (117,744) | (14,162) | 1,921
Property Plant And Equipment Telecommunications Segment [Member] |  |  |
Disclosure of operating costs and expenses [line items] |  |  |
Credit losses, provisions and reversals | 87,399 |  |
Expected Credit Losses (Trade Accounts And Other Receivables) [Member |  |  |
Disclosure of operating costs and expenses [line items] |  |  |
Credit losses, provisions and reversals | 153,640 | 96,202 | 90,589
Tax Credits Estimated Losses [Member] |  |  |
Disclosure of operating costs and expenses [line items] |  |  |
Credit losses, provisions and reversals | (3,456) | R$ 9,779 | 11,470
Accounts Receivable Related To The Concession Compensation [Member] |  |  |
Disclosure of operating costs and expenses [line items] |  |  |
Credit losses, provisions and reversals | R$ (2,945) |  | R$ (1,117)

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