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Intangible Assets | 12 Months Ended
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Dec. 31, 2019
Goodwill and Intangible Assets Disclosure [Abstract] |
Intangible Assets | 13. INTANGIBLE ASSETS Intangible assets were as follows:
|  | Estimated weighted average useful life in years |  |  | 2019 |  |  | 2018 |
Cost |  |  |  |  |  |  |  |  |  |  |  |
Customer relationship intangibles [note 7] |  |  | 9 |  |  | $ | 429 |  |  | $ | 415 |
Computer software |  |  | 1 |  |  |  | 396 |  |  |  | 291 |
Patent and licenses |  |  | 11 |  |  |  | 264 |  |  |  | 340 |
|  |  |  |  |  |  | 1,089 |  |  |  | 1,046 |
Accumulated depreciation |  |  |  |  |  |  |  |  |  |  |  |
Customer relationship intangibles [note 7] |  |  |  |  |  |  | (216 | ) |  |  | (191 | )
Computer software |  |  |  |  |  |  | (310 | ) |  |  | (219 | )
Patent and licenses |  |  |  |  |  |  | (79 | ) |  |  | (76 | )
|  |  |  |  |  | $ | 484 |  |  | $ | 560 |
The Company recorded approximately $93 million and $84 million of amortization expense related to finite-lived intangible assets for the years ended December 31, 2019 and 2018, respectively. The Company currently estimates annual amortization expense to be $85 million for 2020, $66 million for 2021, $53 million for 2022, $47 million for 2023 and $43 million for 2024.

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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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