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Other Intangible Assets | 12 Months Ended
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Dec. 31, 2017
Goodwill and Intangible Assets Disclosure [Abstract] |
Other Intangible Assets |
| 9. | OTHER INTANGIBLE ASSETS
Other intangible assets consisted of the following:
December 31, 2017 |  | Gross Cost |  |  | Accumulated Amortization |  |  | Net Cost |
Technologies & licences |  |  | 668 |  |  |  | (566 | ) |  |  | 102 |
Contractual customer relationships |  |  | 5 |  |  |  | (5 | ) |  |  | — |
Purchased & internally developed software |  |  | 440 |  |  |  | (383 | ) |  |  | 57 |
Construction in progress |  |  | 50 |  |  |  | — |  |  |  | 50 |
Other intangible assets |  |  | 65 |  |  |  | (65 | ) |  |  | — |
Total |  |  | 1,228 |  |  |  | (1,019 | ) |  |  | 209 |
December 31, 2016 |  | Gross Cost |  |  | Accumulated Amortization |  |  | Net Cost |
Technologies & licences |  |  | 618 |  |  |  | (534 | ) |  |  | 84 |
Contractual customer relationships |  |  | 4 |  |  |  | (4 | ) |  |  | — |
Purchased & internally developed software |  |  | 407 |  |  |  | (347 | ) |  |  | 60 |
Construction in progress |  |  | 51 |  |  |  | — |  |  |  | 51 |
Other intangible assets |  |  | 65 |  |  |  | (65 | ) |  |  | — |
Total |  |  | 1,145 |  |  |  | (950 | ) |  |  | 195 |
The line “Construction in progress” in the table above includes internally developed software under construction and software not ready for use. As described in Note 7, the acquisition of ams’s NFC and RFID Reader business resulted in the recognition in the year ended December 31, 2016 of technology for $6 million in “Technologies & licences” and in-process R&D for $40 million in “Construction in progress”. The amortization expense in 2017, 2016 and 2015 was $58 million, $61 million and $60 million, respectively. The estimated amortization expense of the existing intangible assets for the following years is:
Year |  |  |
2018 |  |  | 75 |
2019 |  |  | 58 |
2020 |  |  | 41 |
2021 |  |  | 22 |
2022 |  |  | 10 |
Thereafter |  |  | 3 |
Total |  |  | 209 |
In 2017, there was no impairment of intangible assets, while in 2016 and 2015, the Company impaired $4 million and $10 million, respectively, of acquired technologies for which it was determined that they had no alternative future use. In addition, in 2015, $6 million of digital long-lived assets were fully impaired due to the fact that their projected cash flows, over their remaining useful life, were less than their carrying value.

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- Definition The entire disclosure for all or part of the information related to intangible assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -URI http://asc.fasb.org/topic&trid=2144416 + Details
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