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7 Trade Accounts Receivable (Details 1) - BRL (R$) R$ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019
TradeAndOtherReceivablesLineItems [Line Items] |  |
Allowance for doubtful accounts, beginning | R$ 376,756 | R$ 331,388
Additions / (Reversals) | 127,896 | 162,477
Reversal or write offs | (136,603) | (117,109)
Reclassification | (2,498) |
Allowance for doubtful accounts, ending | 365,551 | 376,756
Customers [member] |  |
TradeAndOtherReceivablesLineItems [Line Items] |  |
Allowance for doubtful accounts, beginning | 218,989 | 186,258
Additions / (Reversals) | 123,657 | 136,514
Reversal or write offs | (129,550) | (103,783)
Reclassification |  |
Allowance for doubtful accounts, ending | 213,096 | 218,989
Customers [member] | Residential [member] |  |
TradeAndOtherReceivablesLineItems [Line Items] |  |
Allowance for doubtful accounts, beginning | 41,824 | 21,722
Additions / (Reversals) | 65,937 | 71,794
Reversal or write offs | (60,365) | (51,692)
Reclassification |  |
Allowance for doubtful accounts, ending | 47,396 | 41,824
Customers [member] | Industrial [member] |  |
TradeAndOtherReceivablesLineItems [Line Items] |  |
Allowance for doubtful accounts, beginning | 97,954 | 87,197
Additions / (Reversals) | 22,487 | 33,772
Reversal or write offs | (31,575) | (23,015)
Reclassification |  |
Allowance for doubtful accounts, ending | 88,866 | 97,954
Customers [member] | Commercial [member] |  |
TradeAndOtherReceivablesLineItems [Line Items] |  |
Allowance for doubtful accounts, beginning | 70,925 | 69,717
Additions / (Reversals) | 29,092 | 27,866
Reversal or write offs | (31,294) | (26,658)
Reclassification |  |
Allowance for doubtful accounts, ending | 68,723 | 70,925
Customers [member] | Rural [member] |  |
TradeAndOtherReceivablesLineItems [Line Items] |  |
Allowance for doubtful accounts, beginning | 3,389 | 3,810
Additions / (Reversals) | 4,788 | 1,499
Reversal or write offs | (4,240) | (1,920)
Reclassification |  |
Allowance for doubtful accounts, ending | 3,937 | 3,389
Customers [member] | Public entities [member] |  |
TradeAndOtherReceivablesLineItems [Line Items] |  |
Allowance for doubtful accounts, beginning | 4,890 | 4,874
Additions / (Reversals) | 9 | 435
Reversal or write offs | (1,815) | (419)
Reclassification |  |
Allowance for doubtful accounts, ending | 3,084 | 4,890
Customers [member] | Public lighting [member] |  |
TradeAndOtherReceivablesLineItems [Line Items] |  |
Allowance for doubtful accounts, beginning | 3 | 120
Additions / (Reversals) | 20 | (117)
Reversal or write offs | (15) |
Reclassification |  |
Allowance for doubtful accounts, ending | 8 | 3
Customers [member] | Public service [member] |  |
TradeAndOtherReceivablesLineItems [Line Items] |  |
Allowance for doubtful accounts, beginning | 265 | 199
Additions / (Reversals) | 124 | 145
Reversal or write offs | (246) | (79)
Reclassification |  |
Allowance for doubtful accounts, ending | 143 | 265
Customers [member] | Unbilled - captives [member] |  |
TradeAndOtherReceivablesLineItems [Line Items] |  |
Allowance for doubtful accounts, beginning | 1,180 | 1,502
Additions / (Reversals) | 409 | (322)
Reversal or write offs |  |
Reclassification |  |
Allowance for doubtful accounts, ending | 1,589 | 1,180
Customers [member] | Adjustment to present value [member] |  |
TradeAndOtherReceivablesLineItems [Line Items] |  |
Allowance for doubtful accounts, beginning | (1,441) | (2,883)
Additions / (Reversals) | 791 | 1,442
Reversal or write offs |  |
Reclassification |  |
Allowance for doubtful accounts, ending | (650) | (1,441)
Concessionaires, permission holder and trading companies [member] |  |
TradeAndOtherReceivablesLineItems [Line Items] |  |
Allowance for doubtful accounts, beginning | 140,090 | 129,139
Additions / (Reversals) | 392 | 11,608
Reversal or write offs | (284) | (657)
Reclassification |  |
Allowance for doubtful accounts, ending | 140,198 | 140,090
Concessionaires, permission holder and trading companies [member] | CCEE [member] |  |
TradeAndOtherReceivablesLineItems [Line Items] |  |
Allowance for doubtful accounts, beginning | 119,665 | 119,665
Additions / (Reversals) |  |
Reversal or write offs |  |
Reclassification |  |
Allowance for doubtful accounts, ending | 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 | 20,425 | 9,474
Additions / (Reversals) | 392 | 11,608
Reversal or write offs | (284) | (657)
Reclassification |  |
Allowance for doubtful accounts, ending | 20,533 | 20,425
Telecommunications [member] |  |
TradeAndOtherReceivablesLineItems [Line Items] |  |
Allowance for doubtful accounts, beginning | 5,149 | 3,879
Additions / (Reversals) | 3,609 | 13,292
Reversal or write offs | (6,260) | (12,022)
Reclassification | (2,498) |
Allowance for doubtful accounts, ending |  | 5,149
Gas Distribution [member] |  |
TradeAndOtherReceivablesLineItems [Line Items] |  |
Allowance for doubtful accounts, beginning | 12,528 | 12,112
Additions / (Reversals) | 238 | 1,063
Reversal or write offs | (509) | (647)
Reclassification |  |
Allowance for doubtful accounts, ending | R$ 12,257 | R$ 12,528

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