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33 Supplemental cash flow information (Tables)
 12 Months Ended
Dec. 31, 2020
Supplemental Cash Flow Informations Abstract  
Schedule of supplemental cash flow information
2020 2019 2018
       
Total additions to contract assets (Note 14) 3,948,158 3,532,283 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 - São Lourenço PPP (Note 15 (g)) - 10,591 273,737
Performance agreements 314,720 78,296 -
Right of use 28,549 113,233 -
Construction margin (Note 26) 85,976 65,172 63,013
Agreement with the Municipality of Mauá (Note 10 (a)) 280,774 - -
Agreement with the Municipality of Santo André - 1,336,908 -
Agreement with the municipality of Guarulhos - - 928,014
Total 1,095,285 2,125,943 2,201,112