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33 Supplemental cash flow information (Details) - BRL (R$)
R$ in Thousands
 12 Months Ended
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.