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9. Trade receivables (Details) - BRL (R$) R$ in Thousands | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
--- | --- | --- | --- | ---
SummaryOfTradeReceivablesLineItems [Line Items] |  |  |  |
Trade receivables, gross | R$ 5,538,703 | R$ 5,225,546 |  |
Allowance for doubtful accounts | (3,650,198) | (3,514,240) | R$ (3,307,793) | R$ (3,164,288)
Total trade receivables | 1,888,505 | 1,711,306 |  |
Current | 1,672,595 | 1,557,472 |  |
Noncurrent | 215,910 | 153,834 |  |
Total | 1,888,505 | 1,711,306 |  |
Unbilled supply |  |  |  |
SummaryOfTradeReceivablesLineItems [Line Items] |  |  |  |
Trade receivables, gross | 580,006 | 481,389 |  |
Private sector |  |  |  |
SummaryOfTradeReceivablesLineItems [Line Items] |  |  |  |
Trade receivables, gross | 1,569,011 | 1,520,849 |  |
Private sector | General and special customers |  |  |  |
SummaryOfTradeReceivablesLineItems [Line Items] |  |  |  |
Trade receivables, gross | 1,248,979 | 1,205,498 |  |
Private sector | Agreements |  |  |  |
SummaryOfTradeReceivablesLineItems [Line Items] |  |  |  |
Trade receivables, gross | 320,032 | 315,351 |  |
Government entities |  |  |  |
SummaryOfTradeReceivablesLineItems [Line Items] |  |  |  |
Trade receivables, gross | 821,481 | 803,813 |  |
Government entities | Agreements |  |  |  |
SummaryOfTradeReceivablesLineItems [Line Items] |  |  |  |
Trade receivables, gross | 285,614 | 279,449 |  |
Government entities | Municipal |  |  |  |
SummaryOfTradeReceivablesLineItems [Line Items] |  |  |  |
Trade receivables, gross | 532,320 | 520,950 |  |
Government entities | Federal |  |  |  |
SummaryOfTradeReceivablesLineItems [Line Items] |  |  |  |
Trade receivables, gross | 3,547 | 3,414 |  |
Wholesale customers - Municipal governments |  |  |  |
SummaryOfTradeReceivablesLineItems [Line Items] |  |  |  |
Trade receivables, gross | 2,568,205 | 2,419,495 |  |
Wholesale customers - Municipal governments | Guarulhos |  |  |  |
SummaryOfTradeReceivablesLineItems [Line Items] |  |  |  |
Trade receivables, gross | 760,598 | 778,106 |  |
Wholesale customers - Municipal governments | Maua |  |  |  |
SummaryOfTradeReceivablesLineItems [Line Items] |  |  |  |
Trade receivables, gross | 530,830 | 467,775 |  |
Wholesale customers - Municipal governments | Mogi das Cruzes |  |  |  |
SummaryOfTradeReceivablesLineItems [Line Items] |  |  |  |
Trade receivables, gross | 2,670 | 2,527 |  |
Wholesale customers - Municipal governments | Santo Andre |  |  |  |
SummaryOfTradeReceivablesLineItems [Line Items] |  |  |  |
Trade receivables, gross | 1,048,832 | 946,045 |  |
Wholesale customers - Municipal governments | Sao Caetano do Sul |  |  |  |
SummaryOfTradeReceivablesLineItems [Line Items] |  |  |  |
Trade receivables, gross | 2,604 | 2,371 |  |
Wholesale customers - Municipal governments | Diadema |  |  |  |
SummaryOfTradeReceivablesLineItems [Line Items] |  |  |  |
Trade receivables, gross | R$ 222,671 | R$ 222,671 |  |

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