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Other Intangible Assets (Tables) | 12 Months Ended
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Dec. 31, 2017
Goodwill and Intangible Assets Disclosure [Abstract] |
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 |
Estimated Amortization Expense of Existing Intangible Assets | 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 |

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- Definition Tabular disclosure of assets, excluding financial assets and goodwill, lacking physical substance with a finite life, by either major class or business segment. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16265-109275 + Details
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- Definition Tabular disclosure of the amount of amortization expense expected to be recorded in succeeding fiscal years for finite-lived intangible assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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