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9. Trade receivables (Details 2) - BRL (R$) R$ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Trade Receivables Details 2 |  |  |
Balance at beginning of the year | R$ 3,514,240 | R$ 3,307,793 | R$ 3,164,288
Bad debt expense recognized during the year - Private sector /government entities | 75,973 | 144,217 | 103,231
Recoveries recognized during the year | (133,730) | (241,109) | (177,993)
Bad debt expense recognized during the year - Wholesale customers | 193,715 | 331,295 | 283,113
Net bad debt expense for the year | 135,958 | 234,403 | 208,351
Write-offs of accounts receivable during the year | 0 | (27,956) | (64,846)
Balance at end of the year | R$ 3,650,198 | R$ 3,514,240 | R$ 3,307,793

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- References No definition available. + Details
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Balance Type: | credit
Period Type: | duration

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- References No definition available. + Details
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- Definition The amount of an allowance account used to record impairments to financial assets due to credit losses. [Refer: Financial assets] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Note Expiry date 2018-01-01 -Name IFRS -Number 7 -IssueDate 2017-01-01 -Paragraph 16 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2017-03-02&anchor=para_16&doctype=Standard&book=B -URIDate 2017-03-09 + Details
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