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Other Intangible Assets | 12 Months Ended
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Dec. 31, 2019
Goodwill And Intangible Assets Disclosure [Abstract] |
Other Intangible Assets |
| 9. | OTHER INTANGIBLE ASSETS
Other intangible assets consisted of the following:
December 31, 2019 |  | Gross Cost |  |  | Accumulated Amortization |  |  | Net Cost |
Technologies & licenses |  |  | 699 |  |  |  | (578 | ) |  |  | 121 |
Purchased & internally developed software |  |  | 486 |  |  |  | (427 | ) |  |  | 59 |
Technologies in progress |  |  | 119 |  |  |  | — |  |  |  | 119 |
Other intangible assets |  |  | 70 |  |  |  | (70 | ) |  |  | — |
Total |  |  | 1,374 |  |  |  | (1,075 | ) |  |  | 299 |
December 31, 2018 |  | Gross Cost |  |  | Accumulated Amortization |  |  | Net Cost |
Technologies & licenses |  |  | 705 |  |  |  | (592 | ) |  |  | 113 |
Purchased & internally developed software |  |  | 459 |  |  |  | (404 | ) |  |  | 55 |
Technologies in progress |  |  | 44 |  |  |  | — |  |  |  | 44 |
Other intangible assets |  |  | 69 |  |  |  | (69 | ) |  |  | — |
Total |  |  | 1,277 |  |  |  | (1,065 | ) |  |  | 212 |
As described in Note 7, the acquisition of Norstel resulted in the recognition of technology in process for $86 million in the line “Technologies in progress”. The line “Technologies in progress” in the table above also includes internally developed software under construction and software not ready for use. The amortization expense in 2019, 2018 and 2017 was $69 million, $64 million and $58 million, respectively. The estimated amortization expense of the existing intangible assets for the following years is:
Year |  |  |  |
2020 |  |  | 81 |
2021 |  |  | 62 |
2022 |  |  | 45 |
2023 |  |  | 27 |
2024 |  |  | 17 |
Thereafter |  |  | 67 |
Total |  |  | 299 |
In both 2019 and 2018, the Company impaired $4 million and $2 million, respectively, of acquired licenses and technologies for which it was determined that they had no alternative future use, while in 2017, there was no impairment of intangible assets.

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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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