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Other Intangible Assets, Net | 12 Months Ended
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Dec. 31, 2020
Goodwill And Intangible Assets Disclosure [Abstract] |
Other Intangible Assets, Net |
| 9. | OTHER INTANGIBLE ASSETS, NET
Other intangible assets, net consisted of the following:
December 31, 2020 |  | Gross Cost |  |  | Accumulated Amortization |  |  | Net Cost |
Technologies & licenses |  |  | 934 |  |  |  | (623 | ) |  |  | 311 |
Purchased & internally developed software |  |  | 537 |  |  |  | (461 | ) |  |  | 76 |
Technologies in progress |  |  | 56 |  |  |  | — |  |  |  | 56 |
Other intangible assets |  |  | 72 |  |  |  | (70 | ) |  |  | 2 |
Total |  |  | 1,599 |  |  |  | (1,154 | ) |  |  | 445 |
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 |
As described in Note 7, the acquisitions completed in 2020 resulted in the recognition of technologies of $108 million, reported on the line “Technologies & licenses”, $10 million of technology in progress reported on the line “Technologies in progress” and $2 million of other intangible assets reported on the line “Other intangible assets”. Furthermore, the 2019 acquisition of Norstel resulted in the recognition of technology in progress for $86 million reported on the line “Technologies in progress” as at December 31, 2019. The acquired technology was reported on the line “Technologies & licenses” as at December 31, 2020. 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 2020, 2019 and 2018 was $79 million, $69 million and $64 million, respectively. The estimated amortization expense of the existing intangible assets for the following years is:
Year |  |  |  |
2021 |  |  | 97 |
2022 |  |  | 82 |
2023 |  |  | 64 |
2024 |  |  | 49 |
2025 |  |  | 35 |
Thereafter |  |  | 118 |
Total |  |  | 445 |
In 2020, 2019 and 2018, the Company impaired $4 million, $4 million and $2 million, respectively, of acquired licenses and 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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