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Intangible Assets | 12 Months Ended
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Dec. 31, 2021
Goodwill and Intangible Assets Disclosure [Abstract] |
Intangible Assets | 11. INTANGIBLE ASSETS Intangible assets consist of:
|  | Remaining weighted average useful life in years |  | 2021 |  |  | 2020 |
Cost |  |  |  |  |  |  |  |  |  |
Customer relationship intangibles |  | 7 |  | $ | 386 |  |  | $ | 348 |
Computer software |  | 1 |  |  | 463 |  |  |  | 463 |
Patents and licenses |  | 7 |  |  | 314 |  |  |  | 282 |
|  |  |  |  | 1,163 |  |  |  | 1,093 |
Accumulated depreciation |  |  |  |  |  |  |  |  |  |
Customer relationship intangibles |  |  |  |  | (175 | ) |  |  | (150 | )
Computer software |  |  |  |  | (360 | ) |  |  | (361 | )
Patents and licenses |  |  |  |  | (135 | ) |  |  | (101 | )
|  |  |  | $ | 493 |  |  | $ | 481 |
The Company recorded $114 million and $85 million of amortization expense related to finite-lived intangible assets for the years ended December 31, 2021 and 2020, respectively. The Company currently estimates annual amortization expense to be $111 million for 2022, $77 million for 2023, $59 million for 2024, $54 million for 2025 and $51 million for 2026.

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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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