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33 Supplemental cash flow information (Details) - BRL (R$) R$ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Supplemental Cash Flow Informations Abstract |  |  |  |
Total additions to contract assets (Note 14) | R$ 3,984,158 | [1] | R$ 3,532,283 | R$ 3,188,943
Total additions to intangible assets (Note 15 (b)) | 411,285 |  | 1,788,907 | 1,144,728
Items not affecting cash (see breakdown below) | (1,095,285) |  | (2,125,943) | (2,201,112)
Total additions to intangible assets as per statement of cash flows | 3,300,158 |  | 3,195,247 | 2,132,559
Investments and financing operations affecting intangible assets but not cash: |  |  |  |
Interest capitalized in the year (Note 15 (d)) | 238,330 |  | 233,251 | 488,502
Contractors payable | 142,514 |  | 252,675 | 297,872
Program contract commitments | 4,422 |  | 35,817 | 149,974
Public Private Partnership - Sao Lourenco PPP (Note 15 (g)) | 0 |  | 10,591 | 273,737
Performance agreements | 314,720 |  | 78,296 | 0
Right of use | 28,549 |  | 113,233 | 0
Construction margin (Note 26) | 85,976 |  | 65,172 | 63,013
Agreement with the Municipality of Maua (Note 10 (a)) | 280,774 |  | 0 | 0
Agreement with the Municipality of Santo Andre | 0 |  | 1,336,908 | 0
Agreement with the municipality of Guarulhos | 0 |  | 0 | 928,014
Total | R$ 1,095,285 |  | R$ 2,125,943 | R$ 2,201,112
[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.

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