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9. Trade receivables (Details 4) - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Trade Receivables Details 3Abstract      
Write-offs R$ (184,555) R$ (171,729) R$ (177,492)
(Losses)/reversal with state entities - related parties 1,294 21,510 (7,292)
Losses with private sector / government entities (61,315) (75,973) (144,217)
Losses with wholesale customers (29,458) 9,781 (2,596)
Recoveries 107,307 133,730 241,109
Amount reported in selling expenses R$ (166,727) R$ (82,681) R$ (90,488)