| b) | Deferred income tax assets and liabilities: |
| December 31, 2017 |
December 31, 2016 |
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Assets credit of: |
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Income tax loss carry forwards |
2,112,707 | 1,900,366 | ||||||
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Social contribution tax loss carry forwards |
772,304 | 704,480 | ||||||
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Temporary differences |
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Foreign exchange—Loans and borrowings |
548,568 | 590,696 | ||||||
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Legal proceedings provision |
365,997 | 367,060 | ||||||
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Tax deductible goodwill |
56,276 | 225,104 | ||||||
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Impairment provision |
250,236 | 319,070 | ||||||
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Provisions for employee benefits |
153,434 | 138,655 | ||||||
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Allowance for doubtful accounts |
25,991 | 77,168 | ||||||
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Regulatory asset (liability) |
65,318 | 71,039 | ||||||
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Impairment of tax credit |
61,324 | 51,057 | ||||||
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Share-based payment transactions |
291 | — | ||||||
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Profit sharing |
41,506 | 28,732 | ||||||
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Interest on preferred shareholders payable in subsidiaries |
218,599 | 219,019 | ||||||
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Property, plant and equipment—useful life review |
160,490 | 27,987 | ||||||
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Contractual dispute |
115,490 | 120,952 | ||||||
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Other |
297,932 | 264,094 | ||||||
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Total |
5,246,463 | 5,105,479 | ||||||
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(-) Deferred taxes assets not recognized |
(1,961,325 | ) | (1,781,670 | ) | ||||
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Liabilities credit of: |
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Temporary differences |
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|
Business combination—property, plant and equipment |
110,149 | 144,952 | ||||||
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Tax deductible goodwill |
(369,044 | ) | (348,192 | ) | ||||
|
Lease |
(277,091 | ) | (138,525 | ) | ||||
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Concession contract |
(8,681 | ) | (10,617 | ) | ||||
|
Unrealized gains on derivatives instruments |
(102,410 | ) | (47,757 | ) | ||||
|
Income on formation of joint ventures |
(1,135,036 | ) | (1,135,036 | ) | ||||
|
Business combination—Intangible asset |
(3,723,742 | ) | (3,764,925 | ) | ||||
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Other |
(45,513 | ) | (84,272 | ) | ||||
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Total |
(5,551,368 | ) | (5,384,372 | ) | ||||
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Total of deferred taxes recorded |
(2,266,230 | ) | (2,060,563 | ) | ||||
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Deferred income tax—Assets |
1,636,080 | 1,490,002 | ||||||
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Deferred income tax—Liabilities |
(3,902,310 | ) | (3,550,565 | ) | ||||
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