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Other Intangible Assets | 12 Months Ended
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Dec. 31, 2018
Goodwill and Intangible Assets Disclosure [Abstract] |
Other Intangible Assets |
8. | OTHER INTANGIBLE ASSETS
Other intangible assets consisted of the following:
December 31, 2018 |  | Gross Cost |  |  | Accumulated Amortization |  |  | Net Cost |
Technologies & licences |  |  | 705 |  |  |  | (592 | ) |  |  | 113 |
Purchased & internally developed software |  |  | 459 |  |  |  | (404 | ) |  |  | 55 |
Construction in progress |  |  | 44 |  |  |  | — |  |  |  | 44 |
Other intangible assets |  |  | 69 |  |  |  | (69 | ) |  |  | — |
Total |  |  | 1,277 |  |  |  | (1,065 | ) |  |  | 212 |
December 31, 2017 |  | Gross Cost |  |  | Accumulated Amortization |  |  | Net Cost |
Technologies & licences |  |  | 668 |  |  |  | (566 | ) |  |  | 102 |
Purchased & internally developed software |  |  | 440 |  |  |  | (383 | ) |  |  | 57 |
Construction in progress |  |  | 50 |  |  |  | — |  |  |  | 50 |
Other intangible assets |  |  | 70 |  |  |  | (70 | ) |  |  | — |
Total |  |  | 1,228 |  |  |  | (1,019 | ) |  |  | 209 |
The line “Construction in progress” in the table above includes internally developed software under construction and software not ready for use. The amortization expense in 2018, 2017 and 2016 was $64 million, $58 million and $61 million, respectively. The estimated amortization expense of the existing intangible assets for the following years is:
Year |  |  |
2019 |  |  | 77 |
2020 |  |  | 60 |
2021 |  |  | 40 |
2022 |  |  | 23 |
2023 |  |  | 8 |
Thereafter |  |  | 4 |
Total |  |  | 212 |
In 2018, the Company impaired $2 million of acquired technologies for which it was determined that they had no alternative future use. In 2017, there was no impairment of intangible assets, while in 2016, the Company impaired $4 million of acquired technologies for which it was determined that they had no alternative future use.

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- Definition The entire disclosure for all or part of the information related to intangible assets. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -URI http://asc.fasb.org/topic&trid=2144416 + Details
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