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31. Supplemental cash flow information (Details) - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Supplemental Cash Flow Information Details      
Total additions to intangible assets (Note 14 (b)) R$ 3,490,298 R$ 3,855,831 R$ 3,604,442
Items not affecting cash (see breakdown below) (1,532,518) (1,747,664) (1,207,090)
Total additions to intangible assets as per statement of cash flows 1,957,780 2,108,167 2,397,352
Investments and financing operations affecting intangible assets but not cash:      
Interest capitalized in the year 649,048 700,743 466,544
Contractors payable 213,340 57,431 (57,041)
Program contract commitments 95,126 4,262 136,543
Public Private Partnership - Sao Lourenco PPP 501,591 893,181 548,978
Leases 3,078 10,534 36,877
Construction margin (70,335) (81,513) (72,908)
Other 0 0 2,281
Total R$ 1,532,518 R$ 1,747,664 R$ 1,207,090