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9. Trade receivables (Details) - BRL (R$) R$ in Thousands | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | --- | --- | ---
SummaryOfTradeReceivablesLineItems [Line Items] |  |  |  |
Trade receivables, gross | R$ 3,151,858 | R$ 2,956,478 |  |
Allowance for doubtful accounts | (1,099,442) | (1,067,973) | R$ (1,068,747) | R$ (977,758)
Total trade receivables | 2,052,416 | 1,888,505 |  |
Current | 1,843,333 | 1,672,595 |  |
Noncurrent | 209,083 | 215,910 |  |
Total | 2,052,416 | 1,888,505 |  |
Unbilled supply |  |  |  |
SummaryOfTradeReceivablesLineItems [Line Items] |  |  |  |
Trade receivables, gross | 571,072 | 560,712 |  |
Private sector |  |  |  |
SummaryOfTradeReceivablesLineItems [Line Items] |  |  |  |
Trade receivables, gross | 1,720,346 | 1,569,011 |  |
Private sector | General and special customers |  |  |  |
SummaryOfTradeReceivablesLineItems [Line Items] |  |  |  |
Trade receivables, gross | 1,372,667 | 1,248,979 |  |
Private sector | Agreements |  |  |  |
SummaryOfTradeReceivablesLineItems [Line Items] |  |  |  |
Trade receivables, gross | 347,679 | 320,032 |  |
Government entities |  |  |  |
SummaryOfTradeReceivablesLineItems [Line Items] |  |  |  |
Trade receivables, gross | 854,515 | 821,481 |  |
Government entities | Agreements |  |  |  |
SummaryOfTradeReceivablesLineItems [Line Items] |  |  |  |
Trade receivables, gross | 274,906 | 285,614 |  |
Government entities | Municipal |  |  |  |
SummaryOfTradeReceivablesLineItems [Line Items] |  |  |  |
Trade receivables, gross | 575,733 | 532,320 |  |
Government entities | Federal |  |  |  |
SummaryOfTradeReceivablesLineItems [Line Items] |  |  |  |
Trade receivables, gross | 3,876 | 3,547 |  |
Wholesale customers - Municipal governments |  |  |  |
SummaryOfTradeReceivablesLineItems [Line Items] |  |  |  |
Trade receivables, gross | 5,925 | 5,274 |  |
Total trade receivables | 1,994,905 | 2,568,205 |  |
Total | 1,994,905 | 2,568,205 |  |
Wholesale customers - Municipal governments | Mogi das Cruzes |  |  |  |
SummaryOfTradeReceivablesLineItems [Line Items] |  |  |  |
Trade receivables, gross | 3,056 | 2,670 |  |
Total trade receivables | 3,056 | 2,670 |  |
Total | 3,056 | 2,670 |  |
Wholesale customers - Municipal governments | Sao Caetano do Sul |  |  |  |
SummaryOfTradeReceivablesLineItems [Line Items] |  |  |  |
Trade receivables, gross | 2,869 | 2,604 |  |
Total trade receivables | 2,869 | 2,604 |  |
Total | R$ 2,869 | R$ 2,604 |  |

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