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26. Operating segment information (Details) - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
SummaryOfOperatingSegmentInformationLineItems [Line Items]      
Gross operating revenue R$ 17,056,279 R$ 15,374,623 R$ 14,855,109
Gross sales deductions (971,185) (766,390) (756,901)
Net operating revenue 16,085,094 14,608,233 14,098,208
Costs, selling and administrative expenses (10,943,540) (10,646,646) (10,678,063)
Income from operations before other operating expenses, net and equity accounting 5,141,554 3,961,587 3,420,145
Other operating income / (expenses), net 28,591 (5,679) 4,722
Equity accounting 6,510 5,760 4,740
Financial result, net (1,264,336) (458,054) 699,447
Income from operations before taxes 3,912,319 3,503,614 4,129,054
Depreciation and amortization (1,392,541) (1,301,897) 1,146,626
Sanitation      
SummaryOfOperatingSegmentInformationLineItems [Line Items]      
Gross operating revenue 14,253,609 12,223,746 11,122,232
Gross sales deductions (971,185) (766,390) (756,901)
Net operating revenue 13,282,424 11,457,356 10,365,331
Costs, selling and administrative expenses (8,203,883) (7,566,104) (7,026,699)
Income from operations before other operating expenses, net and equity accounting 5,078,541 3,891,252 3,338,632
Depreciation and amortization (1,392,541) (1,301,897) 1,146,626
Reconciliation to the financial statements      
SummaryOfOperatingSegmentInformationLineItems [Line Items]      
Gross operating revenue 2,802,670 3,150,877 3,732,877
Gross sales deductions 0 0 0
Net operating revenue 2,802,670 3,150,877 3,732,877
Costs, selling and administrative expenses (2,739,657) (3,080,542) (3,651,364)
Income from operations before other operating expenses, net and equity accounting R$ 63,013 70,335 81,513
Depreciation and amortization   R$ 0 R$ 0