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Other Intangible Assets, Net (Tables) | 12 Months Ended
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Dec. 31, 2020
Goodwill And Intangible Assets Disclosure [Abstract] |
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 |
Estimated Amortization Expense of Existing Intangible Assets | 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 |

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