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31. Supplemental cash flow information
 12 Months Ended
Dec. 31, 2017
Supplemental Cash Flow Information  
Supplemental cash flow information
  2017 2016 2015
       
Total additions to intangible assets (Note 14 (b)) 3,490,298 3,855,831 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 (Note 14 (d)) 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 - São Lourenço PPP (Note 14 (g)) 501,591 893,181 548,978
Leases 3,078 10,534 36,877
Construction margin (Note 24) 70,335 81,513 72,908
Other - - 2,281
Total 1,532,518 1,747,664 1,207,090