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11. INTANGIBLE ASSETS (Tables) | 12 Months Ended
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Dec. 31, 2018
Intangible Assets Tables Abstract |
Intangible assets |
|  |  |  |  |  |  |  |  |  |  |  |  | Consolidated
| Goodwill |  | Customer relationships |  | Software |  | Trademarks and patents |  | Rights and licenses (*) |  | Others |  | Total
Balance at December 31, 2017 | 3,590,931 |  | 300,875 |  | 73,185 |  | 134,137 |  | 3,172,469 |  | 449 |  | 7,272,046
Cost | 3,834,234 |  | 513,068 |  | 167,162 |  | 134,137 |  | 3,185,701 |  | 449 |  | 7,834,751
Accumulated amortization | (133,973) |  | (212,193) |  | (93,977) |  |  |  | (13,232) |  |  |  | (453,375)
Adjustment for accumulated recoverable value | (109,330) |  |  |  |  |  |  |  |  |  |  |  | (109,330)
Balance at December 31, 2017 | 3,590,931 |  | 300,875 |  | 73,185 |  | 134,137 |  | 3,172,469 |  | 449 |  | 7,272,046
Translation adjustment |  |  | 34,107 |  | 148 |  | 15,872 |  |  |  | 58 |  | 50,185
Acquisitions and expenditures |  |  |  |  | 1,216 |  |  |  |  |  | 984 |  | 2,200
Transfer of property, plant and equipment |  |  |  |  | (3,807) |  |  |  |  |  |  |  | (3,807)
Amortization (note 23) |  |  | (46,209) |  | (15,770) |  |  |  | (5,470) |  |  |  | (67,449)
Balance as of December 31, 2018 | 3,590,931 |  | 288,773 |  | 54,972 |  | 150,009 |  | 3,166,999 |  | 1,491 |  | 7,253,175
Cost | 3,831,338 |  | 573,614 |  | 161,067 |  | 150,009 |  | 3,185,701 |  | 1,491 |  | 7,903,220
Accumulated amortization | (131,077) |  | (284,841) |  | (106,095) |  |  |  | (18,702) |  |  |  | (540,715)
Adjustment for accumulated recoverable value | (109,330) |  |  |  |  |  |  |  |  |  |  |  | (109,330)
Balance as of December 31, 2018 | 3,590,931 |  | 288,773 |  | 54,972 |  | 150,009 |  | 3,166,999 |  | 1,491 |  | 7,253,175
Estimated useful lives |
|  |  | Consolidated
| 12/31/2018 |  | 12/31/2017
Software | 7 |  | 8
Customer relationships | 13 |  | 13
Cash generating units |
|  |  |  |  |  |  |  |  |  |  |  | Consolidated
|  |  |  | Goodwill | Trademarks | Total
Cash generating unity |  | Segment |  | 12/31/2018 |  | 12/31/2017 |  | 12/31/2018 |  | 12/31/2017 |  | 12/31/2018 |  | 12/31/2017
Packaging (1) |  | Steel |  | 158,748 |  | 158,748 |  |  |  |  |  | 158,748 |  | 158,748
Long Stel (2) |  | Steel |  | 235,595 |  | 235,595 |  | 150,009 |  | 134,137 |  | 385,604 |  | 369,732
Minning (3) |  | Mining |  | 3,196,588 |  | 3,196,588 |  |  |  |  |  | 3,196,588 |  | 3,196,588
|  |  |  | 3,590,931 |  | 3,590,931 |  | 150,009 |  | 134,137 |  | 3,740,940 |  | 3,725,068
Assumptions for impairment test |
| Metal packaging | Flat steel (*) | Logistic (**) | Mining
Measurement of recoverable value | Discounted Cash Flow | Discounted Cash Flow | Discounted Cash Flow | Discounted Cash Flow
Cash flow projection | Until 2028 + perpetuity | Until 2028 + perpetuity | Until 2027 | Until 2054
Gross Margin | Gross margin updated based on historical data, impacts of business restructuring and market trends | Gross margin updated based on historical data and market trends. | Estimated based on market studies for cargo captures and operational costs according market trends. | Reflects projection of costs due to the progress of the mining plan as well as startup and ramp up of projects . Price and exchange rate projected according industry reports.
Cost atualization | Cost based on historical data of each product and impacts of business restructuring | Updated costs based on historical data and market trends | Costs based on historical data and market trends | Updated costs based on historical data, progress of mining plan as well as startup and ramp up of projects
Growth Rate | Growth of 1.5% p.a in real terms updated by long term inflation of 4.0% p.a. | Growth of 1.4% p.a in real terms updated by long term inflation of 2.5% p.a. of the Euro zone | Growth of 1.5% p.a in real terms | Without growth in real terms updated only by long term inflation of 4.0% p.a.
Discount rate | For Metal packaging, flat steel and mining, these cash flows were considered using a discount rate after taxes between 5% and 13% p.a. in nominal terms. For the logistics segment, cash flows were discounted using a discount rate between 5.41% and 6.41% p.a. in real terms. The discount rate was based on the weighted average cost of capital ("WACC") that reflects the specific risk of each segment.

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