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Contract assets (Details) - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Contract assets [abstract]      
Contract assets, beginning R$ 8,550,102 R$ 7,969,164 R$ 7,617,714
Additions 5,240,528 [1] 4,759,789 3,984,158
Transfers 2,702 2,412 55,706
Transfers of works to intangible assets (5,179,364) [2] (4,181,263) (3,688,414)
Contract assets, ending R$ 8,613,968 [3] R$ 8,550,102 R$ 7,969,164
[1] The largest additions of the period are located in the municipalities of São Paulo, São Bernardo do Campo and Praia Grande, in the amounts of R$ 2,267 million, R$ 181 million and R$ 134 million, respectively.
[2] The largest transfers of the period are located in the municipalities of São Paulo, Praia Grande and São Bernardo do Campo, in the amounts of R$ 2,640 million, R$ 619 million and R$ 324 million, respectively.
[3] The largest works are located in the municipalities of São Paulo, Franca and São Bernardo do Campo, in the amounts of R$ 2,830 million, R$ 324 million and R$ 262 million, respectively.