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33. Supplemental cash flow information (Details) - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Supplemental Cash Flow Information Details Abstract      
Total additions of contract assets (Note 14) R$ 3,188,943 R$ 0 R$ 0
Total additions to intangible assets (Note 15 (b)) 1,144,728 3,490,298 3,855,831
Items not affecting cash (see breakdown below) (2,201,112) (1,532,518) (1,747,664)
Total additions to intangible assets as per statement of cash flows 2,132,559 1,957,780 2,108,167
Investment and financing operations affecting intangible assets but not cash:      
Interest capitalized in the year 488,502 649,048 700,743
Contractors payable 297,872 213,340 57,431
Program contract commitments 149,974 95,126 4,262
Public Private Partnership - Sao Lourenco PPP 273,737 501,591 893,181
Leases 0 3,078 10,534
Construction margin 63,013 70,335 81,513
Agreement signed with the municipality of Guarulhos (Note 9 (a)) 928,014 0 0
Total R$ 2,201,112 R$ 1,532,518 R$ 1,747,664