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14 Contract assets (Tables) | 12 Months Ended
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Dec. 31, 2020
Contract assets [abstract] |
Schedule of contract assets |
| December 31, 2019 | Additions (i) | Transfers | Transfers of works to intangible assets (ii) | December 31, 2020 (iii)
Total contract assets | 7,617,714 | 3,984,158 | 55,706 | (3,688,414) | 7,969,164
| (i) | The largest additions of the period are located in the municipalities of São Paulo, Praia Grande and São Bernardo do Campo, in the amounts of R$ 1,676 million, R$ 284 million and R$ 228 million, respectively.
| (ii) | The largest transfers of the period are located in the municipalities of São 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.
| (iii) | The largest works are located in the municipalities of São Paulo, Praia Grande and São Bernardo do Campo, in the amounts of R$ 3,727 million, R$ 527 million and R$ 496 million, respectively.
| December 31, 2018 | Additions | Write-offs | Transfers | Transfers of works to intangible assets | December 31, 2019
Total contract assets | 7,407,948 | 3,532,283 | (4,910) | 10,710 | (3,328,317) | 7,617,714
| January 1, 2018 | Additions | Transfers of works to intangible assets | December 31, 2018
Total contract assets | 10,387,715 | 3,188,943 | (6,168,710) | 7,407,948

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