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7 Trade Accounts Receivable (Details 1) - BRL (R$) R$ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
TradeAndOtherReceivablesLineItems [Line Items] |  |  |
Allowance for doubtful accounts, beginning | R$ 331,388 | R$ 309,830 | R$ 355,666
Effects of applying new IFRS |  | 21,863 |
Additions/ (reversals) | 162,477 | 96,084 | 90,288
Reversal or write offs | (117,109) | (96,389) | (136,124)
Allowance for doubtful accounts, ending | 376,756 | 331,388 | 309,830
Customers [Member] |  |  |
TradeAndOtherReceivablesLineItems [Line Items] |  |  |
Allowance for doubtful accounts, beginning | 186,258 | 168,211 | 217,466
Effects of applying new IFRS |  | 18,941 |
Additions/ (reversals) | 136,514 | 86,178 | 79,259
Reversal or write offs | (103,783) | (87,072) | (128,514)
Allowance for doubtful accounts, ending | 218,989 | 186,258 | 168,211
Customers [Member] | Residential [Member] |  |  |
TradeAndOtherReceivablesLineItems [Line Items] |  |  |
Allowance for doubtful accounts, beginning | 21,722 | 22,532 | 66,502
Effects of applying new IFRS |  | (5,708) |
Additions/ (reversals) | 71,794 | 62,274 | 36,177
Reversal or write offs | (51,692) | (57,376) | (80,147)
Allowance for doubtful accounts, ending | 41,824 | 21,722 | 22,532
Customers [Member] | Industrial [Member] |  |  |
TradeAndOtherReceivablesLineItems [Line Items] |  |  |
Allowance for doubtful accounts, beginning | 87,197 | 78,779 | 66,563
Effects of applying new IFRS |  | 4,394 |
Additions/ (reversals) | 33,772 | 10,367 | 26,265
Reversal or write offs | (23,015) | (6,343) | (14,049)
Allowance for doubtful accounts, ending | 97,954 | 87,197 | 78,779
Customers [Member] | Commercial [Member] |  |  |
TradeAndOtherReceivablesLineItems [Line Items] |  |  |
Allowance for doubtful accounts, beginning | 69,717 | 59,275 | 67,075
Effects of applying new IFRS |  | 16,973 |
Additions/ (reversals) | 27,866 | 10,318 | 18,101
Reversal or write offs | (26,658) | (16,849) | (25,901)
Allowance for doubtful accounts, ending | 70,925 | 69,717 | 59,275
Customers [Member] | Rural [Member] |  |  |
TradeAndOtherReceivablesLineItems [Line Items] |  |  |
Allowance for doubtful accounts, beginning | 3,810 | 2,731 | 3,130
Effects of applying new IFRS |  | 1,646 |
Additions/ (reversals) | 1,499 | 3,734 | 2,997
Reversal or write offs | (1,920) | (4,301) | (3,396)
Allowance for doubtful accounts, ending | 3,389 | 3,810 | 2,731
Customers [Member] | Public Entities [Member] |  |  |
TradeAndOtherReceivablesLineItems [Line Items] |  |  |
Allowance for doubtful accounts, beginning | 4,874 | 4,835 | 12,981
Effects of applying new IFRS |  | 3,262 |
Additions/ (reversals) | 435 | (1,313) | (3,833)
Reversal or write offs | (419) | (1,910) | (4,313)
Allowance for doubtful accounts, ending | 4,890 | 4,874 | 4,835
Customers [Member] | Public Lighting [Member] |  |  |
TradeAndOtherReceivablesLineItems [Line Items] |  |  |
Allowance for doubtful accounts, beginning | 120 | 40 | 104
Effects of applying new IFRS |  | 389 |
Additions/ (reversals) | (117) | (304) | 205
Reversal or write offs |  | (5) | (269)
Allowance for doubtful accounts, ending | 3 | 120 | 40
Customers [Member] | Public Service [Member] |  |  |
TradeAndOtherReceivablesLineItems [Line Items] |  |  |
Allowance for doubtful accounts, beginning | 199 | 19 | 1,111
Effects of applying new IFRS |  | 460 |
Additions/ (reversals) | 145 | 8 | (653)
Reversal or write offs | (79) | (288) | (439)
Allowance for doubtful accounts, ending | (265) | 199 | 19
Customers [Member] | Unbilled - captives [Member] |  |  |
TradeAndOtherReceivablesLineItems [Line Items] |  |  |
Allowance for doubtful accounts, beginning | 1,502 |  |
Effects of applying new IFRS |  | 1,573 |
Additions/ (reversals) | (322) | (71) |
Reversal or write offs |  |  |
Allowance for doubtful accounts, ending | 1,180 | 1,502 |
Customers [Member] | Adjustment to Present Value [Member] |  |  |
TradeAndOtherReceivablesLineItems [Line Items] |  |  |
Allowance for doubtful accounts, beginning | (2,883) |  |
Effects of applying new IFRS |  | (4,048) |
Additions/ (reversals) | 1,442 | 1,165 |
Reversal or write offs |  |  |
Allowance for doubtful accounts, ending | (1,441) | (2,883) |
Concessionaires, Permission holder and Trading Companies [Member] |  |  |
TradeAndOtherReceivablesLineItems [Line Items] |  |  |
Allowance for doubtful accounts, beginning | 129,139 | 133,854 | 132,742
Effects of applying new IFRS |  | 4,155 |
Additions/ (reversals) | 11,608 | (8,860) | (1,287)
Reversal or write offs | (657) | (10) | (175)
Allowance for doubtful accounts, ending | 140,090 | 129,139 | 133,854
Concessionaires, Permission holder and Trading Companies [Member] | CCEE [Member] |  |  |
TradeAndOtherReceivablesLineItems [Line Items] |  |  |
Allowance for doubtful accounts, beginning | 119,665 | 119,665 | 119,665
Effects of applying new IFRS |  |  |
Additions/ (reversals) |  |  |
Reversal or write offs |  |  |
Allowance for doubtful accounts, ending | (119,665) | 119,665 | 119,665
Concessionaires, Permission holder and Trading Companies [Member] | Concessionaires, Permission holder and Trading Companies [Member] |  |  |
TradeAndOtherReceivablesLineItems [Line Items] |  |  |
Allowance for doubtful accounts, beginning | 9,474 | 14,189 | 13,077
Effects of applying new IFRS |  | 4,155 |
Additions/ (reversals) | 11,608 | (8,860) | 1,287
Reversal or write offs | (657) | (10) | (175)
Allowance for doubtful accounts, ending | 20,425 | 9,474 | 14,189
Telecommunications [Member] |  |  |
TradeAndOtherReceivablesLineItems [Line Items] |  |  |
Allowance for doubtful accounts, beginning | 3,879 | 1,511 | 534
Effects of applying new IFRS |  | (1,233) |
Additions/ (reversals) | 13,292 | 12,749 | 8,309
Reversal or write offs | (12,022) | (9,148) | (7,332)
Allowance for doubtful accounts, ending | 5,149 | 3,879 | 1,511
Gas Distribution [Member] |  |  |
TradeAndOtherReceivablesLineItems [Line Items] |  |  |
Allowance for doubtful accounts, beginning | 12,112 | 6,254 | 4,924
Effects of applying new IFRS |  |  |
Additions/ (reversals) | 1,063 | 6,017 | 1,433
Reversal or write offs | (647) | (159) | (103)
Allowance for doubtful accounts, ending | R$ 12,528 | R$ 12,112 | R$ 6,254

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