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Intangible Assets | 12 Months Ended
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Dec. 31, 2017
Goodwill and Intangible Assets Disclosure [Abstract] |
Intangible Assets |
12. | INTANGIBLE ASSETS
Intangible assets were as follows:
|  | Estimated weighted average useful life in years |  |  | 2017 |  |  | 2016 |
Cost |  |  |  |  |  |  |  |  |  |  |  |
Customer relationship intangibles [note 6] |  |  | 10 |  |  | $ | 438 |  |  | $ | 392 |
Computer software |  |  | 3 |  |  |  | 348 |  |  |  | 316 |
Patent and licenses |  |  | 13 |  |  |  | 342 |  |  |  | 278 |
|  |  |  |  |  |  | 1,128 |  |  |  | 986 |
Accumulated depreciation |  |  |  |  |  |  |  |  |  |  |  |
Customer relationship intangibles [note 6] |  |  |  |  |  |  | (162 | ) |  |  | (96 | )
Computer software |  |  |  |  |  |  | (263 | ) |  |  | (242 | )
Patent and licenses |  |  |  |  |  |  | (53 | ) |  |  | (27 | )
|  |  |  |  |  | $ | 650 |  |  | $ | 621 |
The Company recorded approximately $125 million and $100 million of amortization expense related to finite-lived intangible assets for the years ended December 31, 2017 and 2016, respectively. The Company currently estimates annual amortization expense to be $124 million for 2018, $91 million for 2019, $72 million for 2020, $62 million for 2021 and $59 million for 2022.

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- Definition The entire disclosure for all or part of the information related to intangible assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -URI http://asc.fasb.org/topic&trid=2144416 + Details
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