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## O. Goodwill and Other Intangible Assets 

The following table details the changes in the carrying amount of goodwill: 

<img src='content_image/1035924.jpg'>

In 2017, Arconic recognized an impairment of goodwill in the amount of $719 related to the annual impairment review of the Arconic Forgings and Extrusions business. See Goodwill policy in Note A . 

Other intangible assets were as follows: 

<img src='content_image/1035925.jpg'>

<img src='content_image/1035926.jpg'>

Computer software consists primarily of software costs associated with an enterprise business solution within Arconic to drive common systems among all businesses. 

Amortization expense related to the intangible assets in the tables above for the years ended December 31, 2018, 2017, and 2016 was $81, $71, and $65, respectively, and is expected to be in the range of approximately $63 to $70 annually from 2019 to 2023. 

