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24. Operating segment information (Tables) | 12 Months Ended
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Dec. 31, 2017
Operating Segment Information Tables |
Operating segment information |
| 2017
| Sanitation (i) | Reconciliation to the financial statements (ii) | Balance as per financial statements
Gross operating revenue | 12,223,746 | 3,150,877 | 15,374,623
Gross sales deductions | (766,390) | - | (766,390)
Net operating revenue | 11,457,356 | 3,150,877 | 14,608,233
Costs, selling and administrative expenses | (7,566,104) | (3,080,542) | (10,646,646)
Income from operations before other operating expenses, net and equity accounting | 3,891,252 | 70,335 | 3,961,587
Other operating income / (expenses), net |  |  | (5,679)
Equity accounting |  |  | 5,760
Financial result, net |  |  | (458,054)
Income from operations before taxes |  |  | 3,503,614
Depreciation and amortization | 1,301,897 | - | 1,301,897
(i) See note 31 for further information about non-cash items, other than depreciation and amortization that impact segment results, and for additionals to long-lived asset information; (ii) Construction revenue and related costs not reported to the CODM.
| 2016
| Sanitation (i) | Reconciliation to the financial statements (ii) | Balance as per financial statements
Gross operating revenue | 11,122,232 | 3,732,877 | 14,855,109
Gross sales deductions | (756,901) | - | (756,901)
Net operating revenue | 10,365,331 | 3,732,877 | 14,098,208
Costs, selling and administrative expenses | (7,026,699) | (3,651,364) | (10,678,063)
Income from operations before other operating expenses, net and equity accounting | 3,338,632 | 81,513 | 3,420,145
Other operating income / (expenses), net |  |  | 4,722
Equity accounting |  |  | 4,740
Financial result, net |  |  | 699,447
Income from operations before taxes |  |  | 4,129,054
Depreciation and amortization | 1,146,626 | - | 1,146,626
(i) See note 31 for further information about non-cash items, other than depreciation and amortization that impact segment results, and for additionals to long-lived asset information; (ii) Construction revenue and related costs not reported to the CODM.
| 2015 (Restated)
| Sanitation (i) | Reconciliation to the financial statements (ii) | Balance as per financial statements
Gross operating revenue | 8,946,825 | 3,336,716 | 12,283,541
Gross sales deductions | (571,972) | - | (571,972)
Net operating revenue | 8,374,853 | 3,336,716 | 11,711,569
Costs, selling and administrative expenses | (5,550,122) | (3,263,808) | (8,813,930)
Income from operations before other operating expenses, net and equity accounting | 2,824,731 | 72,908 | 2,897,639
Other operating income / (expenses), net |  |  | 143,755
Equity accounting |  |  | 2,597
Financial result, net |  |  | (2,456,462)
Income from operations before taxes |  |  | 587,529
Depreciation and amortization | 1,074,032 | - | 1,074,032
(i) See note 31 for further information about non-cash items, other than depreciation and amortization that impact segment results, and for additionals to long-lived asset information; (ii) Construction revenue and related costs not reported to the CODM.
Impacts on gross operating income and costs |
| 2017 | 2016 | 2015
Gross revenue from construction recognized under IFRIC 12 (a) | 3,150,877 | 3,732,877 | 3,336,716
Construction costs recognized under IFRIC 12 (a) | (3,080,542) | (3,651,364) | (3,263,808)
Construction margin | 70,335 | 81,513 | 72,908
(a) Revenue from concession construction contracts is recognized in accordance with IAS 11 - Construction Contracts, using the percentage-of-completion method. See Note 13 (f).

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