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14 Contract assets (Details) - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Contract assets [abstract]      
Contract assets, beginning R$ 7,617,714 R$ 7,407,948 R$ 10,387,715
Additions 3,984,158 [1] 3,532,283 3,188,943
Write-offs 0 (4,910) 0
Transfers 55,706 10,710 0
Transfers of works to intangible assets (3,688,414) [2] (3,328,317) (6,168,710)
Contract assets, ending R$ 7,969,164 [3] R$ 7,617,714 R$ 7,407,948
[1] The largest additions of the period are located in the municipalities of Sao Paulo, Praia Grande and Sao Bernardo do Campo, in the amounts of R$ 1,676 million, R$ 284 million and R$ 228 million, respectively.
[2] The largest transfers of the period are located in the municipalities of Sao Paulo, Guarulhos, Cotia and Praia Grande, in the amounts of R$ 1,414 million, R$ 173 million, R$ 117 million and R$ 115 million, respectively.
[3] The largest works are located in the municipalities of Sao Paulo, Praia Grande and Sao Bernardo do Campo, in the amounts of R$ 3,727 million, R$ 527 million and R$ 496 million, respectively.