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9. Trade receivables (Details 2) - BRL (R$)
R$ in Thousands
 12 Months Ended
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