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Intangible Assets | 12 Months Ended
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Dec. 31, 2020
Goodwill and Intangible Assets Disclosure [Abstract] |
Intangible Assets |
11. | INTANGIBLE ASSETS
Intangible assets consist of:
|  | Remaining weighted average useful life in years |  | 2020 |  |  | 2019 |
Cost |  |  |  |  |  |  |  |  |  |
Customer relationship intangibles |  | 8 |  | $ | 348 |  |  | $ | 333 |
Computer software |  | 1 |  |  | 463 |  |  |  | 396 |
Patents and licenses |  | 10 |  |  | 282 |  |  |  | 264 |
|  |  |  |  | 1,093 |  |  |  | 993 |
Accumulated depreciation |  |  |  |  |  |  |  |  |  |
Customer relationship intangibles |  |  |  |  | (150 | ) |  |  | (120 | )
Computer software |  |  |  |  | (361 | ) |  |  | (310 | )
Patents and licenses |  |  |  |  | (101 | ) |  |  | (79 | )
|  |  |  | $ | 481 |  |  | $ | 484 |
The Company recorded approximately $85 million and $93 million of amortization expense related to finite-lived intangible assets for the years ended December 31, 2020 and 2019, respectively. The Company currently estimates annual amortization expense to be $79 million for 2021, $68 million for 2022, $55 million for 2023, $47 million for 2024 and $44 million for 2025.

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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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