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26 Operating segment information (Details) - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Disclosure of operating segments [line items]      
Gross operating revenue R$ 18,874,396 R$ 19,080,598 R$ 17,056,279
Gross sales deductions (1,076,855) (1,096,944) (971,185)
Net operating revenue 17,797,541 17,983,654 16,085,094
Costs, selling and administrative expenses (13,426,960) (12,256,984) (10,943,540)
Income from operations before other operating expenses, net and equity accounting 4,370,581 5,726,670 5,141,554
Other operating income/(expenses), net 107,656 (18,748) 28,591
Equity accounting 14,136 3,701 6,510
Financial result, net (3,166,371) (1,033,681) (1,264,336)
Income from operations before taxes 1,326,002 4,677,942 3,912,319
Depreciation and amortization (2,037,112) (1,780,094) (1,392,541)
Sanitation [member]      
Disclosure of operating segments [line items]      
Gross operating revenue [1] 15,157,780 16,134,032 14,253,609
Gross sales deductions [1] (1,076,855) (1,096,944) (971,185)
Net operating revenue [1] 14,080,925 15,037,088 13,282,424
Costs, selling and administrative expenses [1] (9,796,821) (9,375,590) (8,203,883)
Income from operations before other operating expenses, net and equity accounting [1] 4,284,104 5,661,498 5,078,541
Depreciation and amortization [1] (2,037,112) (1,780,094) (1,392,541)
Reconciliation to the financial statements [member]      
Disclosure of operating segments [line items]      
Gross operating revenue [2] 3,716,616 2,946,566 2,802,670
Gross sales deductions [2] 0 0
Net operating revenue [2] 3,716,616 2,946,566 2,802,670
Costs, selling and administrative expenses [2] (3,630,139) (2,881,394) (2,739,657)
Income from operations before other operating expenses, net and equity accounting [2] R$ 86,477 R$ 65,172 R$ 63,013
[1] See note 33 for further information about non-cash items, other than depreciation and amortization that impact segment results, and for additionals to long-lived asset information.
[2] Construction revenue and related costs not reported to the CODM. Revenue from construction is recognized in accordance with IFRIC 12 (Concession Agreements) and IFRS 15 (Revenue from Contracts with Customers), as all performance obligations are satisfied over time. See Note 15 (e).